1 /* Expands front end tree to back end RTL for GNU C-Compiler
2 Copyright (C) 1987, 88, 89, 91-98, 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* This file handles the generation of rtl code from tree structure
23 at the level of the function as a whole.
24 It creates the rtl expressions for parameters and auto variables
25 and has full responsibility for allocating stack slots.
27 `expand_function_start' is called at the beginning of a function,
28 before the function body is parsed, and `expand_function_end' is
29 called after parsing the body.
31 Call `assign_stack_local' to allocate a stack slot for a local variable.
32 This is usually done during the RTL generation for the function body,
33 but it can also be done in the reload pass when a pseudo-register does
34 not get a hard register.
36 Call `put_var_into_stack' when you learn, belatedly, that a variable
37 previously given a pseudo-register must in fact go in the stack.
38 This function changes the DECL_RTL to be a stack slot instead of a reg
39 then scans all the RTL instructions so far generated to correct them. */
48 #include "insn-flags.h"
50 #include "insn-codes.h"
52 #include "hard-reg-set.h"
53 #include "insn-config.h"
56 #include "basic-block.h"
60 #if !defined PREFERRED_STACK_BOUNDARY && defined STACK_BOUNDARY
61 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
64 #ifndef TRAMPOLINE_ALIGNMENT
65 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
68 /* Some systems use __main in a way incompatible with its use in gcc, in these
69 cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to
70 give the same symbol without quotes for an alternative entry point. You
71 must define both, or neither. */
73 #define NAME__MAIN "__main"
74 #define SYMBOL__MAIN __main
77 /* Round a value to the lowest integer less than it that is a multiple of
78 the required alignment. Avoid using division in case the value is
79 negative. Assume the alignment is a power of two. */
80 #define FLOOR_ROUND(VALUE,ALIGN) ((VALUE) & ~((ALIGN) - 1))
82 /* Similar, but round to the next highest integer that meets the
84 #define CEIL_ROUND(VALUE,ALIGN) (((VALUE) + (ALIGN) - 1) & ~((ALIGN)- 1))
86 /* NEED_SEPARATE_AP means that we cannot derive ap from the value of fp
87 during rtl generation. If they are different register numbers, this is
88 always true. It may also be true if
89 FIRST_PARM_OFFSET - STARTING_FRAME_OFFSET is not a constant during rtl
90 generation. See fix_lexical_addr for details. */
92 #if ARG_POINTER_REGNUM != FRAME_POINTER_REGNUM
93 #define NEED_SEPARATE_AP
96 /* Number of bytes of args popped by function being compiled on its return.
97 Zero if no bytes are to be popped.
98 May affect compilation of return insn or of function epilogue. */
100 int current_function_pops_args
;
102 /* Nonzero if function being compiled needs to be given an address
103 where the value should be stored. */
105 int current_function_returns_struct
;
107 /* Nonzero if function being compiled needs to
108 return the address of where it has put a structure value. */
110 int current_function_returns_pcc_struct
;
112 /* Nonzero if function being compiled needs to be passed a static chain. */
114 int current_function_needs_context
;
116 /* Nonzero if function being compiled can call setjmp. */
118 int current_function_calls_setjmp
;
120 /* Nonzero if function being compiled can call longjmp. */
122 int current_function_calls_longjmp
;
124 /* Nonzero if function being compiled receives nonlocal gotos
125 from nested functions. */
127 int current_function_has_nonlocal_label
;
129 /* Nonzero if function being compiled has nonlocal gotos to parent
132 int current_function_has_nonlocal_goto
;
134 /* Nonzero if this function has a computed goto.
136 It is computed during find_basic_blocks or during stupid life
139 int current_function_has_computed_jump
;
141 /* Nonzero if function being compiled contains nested functions. */
143 int current_function_contains_functions
;
145 /* Nonzero if function being compiled doesn't modify the stack pointer
146 (ignoring the prologue and epilogue). This is only valid after
147 life_analysis has run. */
149 int current_function_sp_is_unchanging
;
151 /* Nonzero if the current function is a thunk (a lightweight function that
152 just adjusts one of its arguments and forwards to another function), so
153 we should try to cut corners where we can. */
154 int current_function_is_thunk
;
156 /* Nonzero if function being compiled can call alloca,
157 either as a subroutine or builtin. */
159 int current_function_calls_alloca
;
161 /* Nonzero if the current function returns a pointer type */
163 int current_function_returns_pointer
;
165 /* If some insns can be deferred to the delay slots of the epilogue, the
166 delay list for them is recorded here. */
168 rtx current_function_epilogue_delay_list
;
170 /* If function's args have a fixed size, this is that size, in bytes.
172 May affect compilation of return insn or of function epilogue. */
174 int current_function_args_size
;
176 /* # bytes the prologue should push and pretend that the caller pushed them.
177 The prologue must do this, but only if parms can be passed in registers. */
179 int current_function_pretend_args_size
;
181 /* # of bytes of outgoing arguments. If ACCUMULATE_OUTGOING_ARGS is
182 defined, the needed space is pushed by the prologue. */
184 int current_function_outgoing_args_size
;
186 /* This is the offset from the arg pointer to the place where the first
187 anonymous arg can be found, if there is one. */
189 rtx current_function_arg_offset_rtx
;
191 /* Nonzero if current function uses varargs.h or equivalent.
192 Zero for functions that use stdarg.h. */
194 int current_function_varargs
;
196 /* Nonzero if current function uses stdarg.h or equivalent.
197 Zero for functions that use varargs.h. */
199 int current_function_stdarg
;
201 /* Quantities of various kinds of registers
202 used for the current function's args. */
204 CUMULATIVE_ARGS current_function_args_info
;
206 /* Name of function now being compiled. */
208 char *current_function_name
;
210 /* If non-zero, an RTL expression for the location at which the current
211 function returns its result. If the current function returns its
212 result in a register, current_function_return_rtx will always be
213 the hard register containing the result. */
215 rtx current_function_return_rtx
;
217 /* Nonzero if the current function uses the constant pool. */
219 int current_function_uses_const_pool
;
221 /* Nonzero if the current function uses pic_offset_table_rtx. */
222 int current_function_uses_pic_offset_table
;
224 /* The arg pointer hard register, or the pseudo into which it was copied. */
225 rtx current_function_internal_arg_pointer
;
227 /* Language-specific reason why the current function cannot be made inline. */
228 char *current_function_cannot_inline
;
230 /* Nonzero if instrumentation calls for function entry and exit should be
232 int current_function_instrument_entry_exit
;
234 /* Nonzero if memory access checking be enabled in the current function. */
235 int current_function_check_memory_usage
;
237 /* The FUNCTION_DECL for an inline function currently being expanded. */
238 tree inline_function_decl
;
240 /* Number of function calls seen so far in current function. */
242 int function_call_count
;
244 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
245 (labels to which there can be nonlocal gotos from nested functions)
248 tree nonlocal_labels
;
250 /* List (chain of EXPR_LIST) of stack slots that hold the current handlers
251 for nonlocal gotos. There is one for every nonlocal label in the function;
252 this list matches the one in nonlocal_labels.
253 Zero when function does not have nonlocal labels. */
255 rtx nonlocal_goto_handler_slots
;
257 /* RTX for stack slot that holds the stack pointer value to restore
259 Zero when function does not have nonlocal labels. */
261 rtx nonlocal_goto_stack_level
;
263 /* Label that will go on parm cleanup code, if any.
264 Jumping to this label runs cleanup code for parameters, if
265 such code must be run. Following this code is the logical return label. */
269 /* Label that will go on function epilogue.
270 Jumping to this label serves as a "return" instruction
271 on machines which require execution of the epilogue on all returns. */
275 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
276 So we can mark them all live at the end of the function, if nonopt. */
279 /* List (chain of EXPR_LISTs) of all stack slots in this function.
280 Made for the sake of unshare_all_rtl. */
283 /* Chain of all RTL_EXPRs that have insns in them. */
286 /* Label to jump back to for tail recursion, or 0 if we have
287 not yet needed one for this function. */
288 rtx tail_recursion_label
;
290 /* Place after which to insert the tail_recursion_label if we need one. */
291 rtx tail_recursion_reentry
;
293 /* Location at which to save the argument pointer if it will need to be
294 referenced. There are two cases where this is done: if nonlocal gotos
295 exist, or if vars stored at an offset from the argument pointer will be
296 needed by inner routines. */
298 rtx arg_pointer_save_area
;
300 /* Offset to end of allocated area of stack frame.
301 If stack grows down, this is the address of the last stack slot allocated.
302 If stack grows up, this is the address for the next slot. */
303 HOST_WIDE_INT frame_offset
;
305 /* List (chain of TREE_LISTs) of static chains for containing functions.
306 Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
307 in an RTL_EXPR in the TREE_VALUE. */
308 static tree context_display
;
310 /* List (chain of TREE_LISTs) of trampolines for nested functions.
311 The trampoline sets up the static chain and jumps to the function.
312 We supply the trampoline's address when the function's address is requested.
314 Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
315 in an RTL_EXPR in the TREE_VALUE. */
316 static tree trampoline_list
;
318 /* Insn after which register parms and SAVE_EXPRs are born, if nonopt. */
319 static rtx parm_birth_insn
;
322 /* Nonzero if a stack slot has been generated whose address is not
323 actually valid. It means that the generated rtl must all be scanned
324 to detect and correct the invalid addresses where they occur. */
325 static int invalid_stack_slot
;
328 /* Last insn of those whose job was to put parms into their nominal homes. */
329 static rtx last_parm_insn
;
331 /* 1 + last pseudo register number possibly used for loading a copy
332 of a parameter of this function. */
335 /* Vector indexed by REGNO, containing location on stack in which
336 to put the parm which is nominally in pseudo register REGNO,
337 if we discover that that parm must go in the stack. The highest
338 element in this vector is one less than MAX_PARM_REG, above. */
339 rtx
*parm_reg_stack_loc
;
341 /* Nonzero once virtual register instantiation has been done.
342 assign_stack_local uses frame_pointer_rtx when this is nonzero. */
343 static int virtuals_instantiated
;
345 /* These variables hold pointers to functions to
346 save and restore machine-specific data,
347 in push_function_context and pop_function_context. */
348 void (*save_machine_status
) PROTO((struct function
*));
349 void (*restore_machine_status
) PROTO((struct function
*));
351 /* Nonzero if we need to distinguish between the return value of this function
352 and the return value of a function called by this function. This helps
355 extern int rtx_equal_function_value_matters
;
356 extern tree sequence_rtl_expr
;
358 /* In order to evaluate some expressions, such as function calls returning
359 structures in memory, we need to temporarily allocate stack locations.
360 We record each allocated temporary in the following structure.
362 Associated with each temporary slot is a nesting level. When we pop up
363 one level, all temporaries associated with the previous level are freed.
364 Normally, all temporaries are freed after the execution of the statement
365 in which they were created. However, if we are inside a ({...}) grouping,
366 the result may be in a temporary and hence must be preserved. If the
367 result could be in a temporary, we preserve it if we can determine which
368 one it is in. If we cannot determine which temporary may contain the
369 result, all temporaries are preserved. A temporary is preserved by
370 pretending it was allocated at the previous nesting level.
372 Automatic variables are also assigned temporary slots, at the nesting
373 level where they are defined. They are marked a "kept" so that
374 free_temp_slots will not free them. */
378 /* Points to next temporary slot. */
379 struct temp_slot
*next
;
380 /* The rtx to used to reference the slot. */
382 /* The rtx used to represent the address if not the address of the
383 slot above. May be an EXPR_LIST if multiple addresses exist. */
385 /* The size, in units, of the slot. */
387 /* The value of `sequence_rtl_expr' when this temporary is allocated. */
389 /* Non-zero if this temporary is currently in use. */
391 /* Non-zero if this temporary has its address taken. */
393 /* Nesting level at which this slot is being used. */
395 /* Non-zero if this should survive a call to free_temp_slots. */
397 /* The offset of the slot from the frame_pointer, including extra space
398 for alignment. This info is for combine_temp_slots. */
399 HOST_WIDE_INT base_offset
;
400 /* The size of the slot, including extra space for alignment. This
401 info is for combine_temp_slots. */
402 HOST_WIDE_INT full_size
;
405 /* List of all temporaries allocated, both available and in use. */
407 struct temp_slot
*temp_slots
;
409 /* Current nesting level for temporaries. */
413 /* Current nesting level for variables in a block. */
415 int var_temp_slot_level
;
417 /* When temporaries are created by TARGET_EXPRs, they are created at
418 this level of temp_slot_level, so that they can remain allocated
419 until no longer needed. CLEANUP_POINT_EXPRs define the lifetime
421 int target_temp_slot_level
;
423 /* This structure is used to record MEMs or pseudos used to replace VAR, any
424 SUBREGs of VAR, and any MEMs containing VAR as an address. We need to
425 maintain this list in case two operands of an insn were required to match;
426 in that case we must ensure we use the same replacement. */
428 struct fixup_replacement
432 struct fixup_replacement
*next
;
435 /* Forward declarations. */
437 static rtx assign_outer_stack_local
PROTO ((enum machine_mode
, HOST_WIDE_INT
,
438 int, struct function
*));
439 static struct temp_slot
*find_temp_slot_from_address
PROTO((rtx
));
440 static void put_reg_into_stack
PROTO((struct function
*, rtx
, tree
,
441 enum machine_mode
, enum machine_mode
,
443 static void fixup_var_refs
PROTO((rtx
, enum machine_mode
, int));
444 static struct fixup_replacement
445 *find_fixup_replacement
PROTO((struct fixup_replacement
**, rtx
));
446 static void fixup_var_refs_insns
PROTO((rtx
, enum machine_mode
, int,
448 static void fixup_var_refs_1
PROTO((rtx
, enum machine_mode
, rtx
*, rtx
,
449 struct fixup_replacement
**));
450 static rtx fixup_memory_subreg
PROTO((rtx
, rtx
, int));
451 static rtx walk_fixup_memory_subreg
PROTO((rtx
, rtx
, int));
452 static rtx fixup_stack_1
PROTO((rtx
, rtx
));
453 static void optimize_bit_field
PROTO((rtx
, rtx
, rtx
*));
454 static void instantiate_decls
PROTO((tree
, int));
455 static void instantiate_decls_1
PROTO((tree
, int));
456 static void instantiate_decl
PROTO((rtx
, int, int));
457 static int instantiate_virtual_regs_1
PROTO((rtx
*, rtx
, int));
458 static void delete_handlers
PROTO((void));
459 static void pad_to_arg_alignment
PROTO((struct args_size
*, int));
460 #ifndef ARGS_GROW_DOWNWARD
461 static void pad_below
PROTO((struct args_size
*, enum machine_mode
,
464 #ifdef ARGS_GROW_DOWNWARD
465 static tree round_down
PROTO((tree
, int));
467 static rtx round_trampoline_addr
PROTO((rtx
));
468 static tree blocks_nreverse
PROTO((tree
));
469 static int all_blocks
PROTO((tree
, tree
*));
470 #if defined (HAVE_prologue) || defined (HAVE_epilogue)
471 static int *record_insns
PROTO((rtx
));
472 static int contains
PROTO((rtx
, int *));
473 #endif /* HAVE_prologue || HAVE_epilogue */
474 static void put_addressof_into_stack
PROTO((rtx
));
475 static void purge_addressof_1
PROTO((rtx
*, rtx
, int, int));
477 /* Pointer to chain of `struct function' for containing functions. */
478 struct function
*outer_function_chain
;
480 /* Given a function decl for a containing function,
481 return the `struct function' for it. */
484 find_function_data (decl
)
489 for (p
= outer_function_chain
; p
; p
= p
->next
)
496 /* Save the current context for compilation of a nested function.
497 This is called from language-specific code.
498 The caller is responsible for saving any language-specific status,
499 since this function knows only about language-independent variables. */
502 push_function_context_to (context
)
505 struct function
*p
= (struct function
*) xmalloc (sizeof (struct function
));
507 p
->next
= outer_function_chain
;
508 outer_function_chain
= p
;
510 p
->name
= current_function_name
;
511 p
->decl
= current_function_decl
;
512 p
->pops_args
= current_function_pops_args
;
513 p
->returns_struct
= current_function_returns_struct
;
514 p
->returns_pcc_struct
= current_function_returns_pcc_struct
;
515 p
->returns_pointer
= current_function_returns_pointer
;
516 p
->needs_context
= current_function_needs_context
;
517 p
->calls_setjmp
= current_function_calls_setjmp
;
518 p
->calls_longjmp
= current_function_calls_longjmp
;
519 p
->calls_alloca
= current_function_calls_alloca
;
520 p
->has_nonlocal_label
= current_function_has_nonlocal_label
;
521 p
->has_nonlocal_goto
= current_function_has_nonlocal_goto
;
522 p
->contains_functions
= current_function_contains_functions
;
523 p
->is_thunk
= current_function_is_thunk
;
524 p
->args_size
= current_function_args_size
;
525 p
->pretend_args_size
= current_function_pretend_args_size
;
526 p
->arg_offset_rtx
= current_function_arg_offset_rtx
;
527 p
->varargs
= current_function_varargs
;
528 p
->stdarg
= current_function_stdarg
;
529 p
->uses_const_pool
= current_function_uses_const_pool
;
530 p
->uses_pic_offset_table
= current_function_uses_pic_offset_table
;
531 p
->internal_arg_pointer
= current_function_internal_arg_pointer
;
532 p
->cannot_inline
= current_function_cannot_inline
;
533 p
->max_parm_reg
= max_parm_reg
;
534 p
->parm_reg_stack_loc
= parm_reg_stack_loc
;
535 p
->outgoing_args_size
= current_function_outgoing_args_size
;
536 p
->return_rtx
= current_function_return_rtx
;
537 p
->nonlocal_goto_handler_slots
= nonlocal_goto_handler_slots
;
538 p
->nonlocal_goto_stack_level
= nonlocal_goto_stack_level
;
539 p
->nonlocal_labels
= nonlocal_labels
;
540 p
->cleanup_label
= cleanup_label
;
541 p
->return_label
= return_label
;
542 p
->save_expr_regs
= save_expr_regs
;
543 p
->stack_slot_list
= stack_slot_list
;
544 p
->parm_birth_insn
= parm_birth_insn
;
545 p
->frame_offset
= frame_offset
;
546 p
->tail_recursion_label
= tail_recursion_label
;
547 p
->tail_recursion_reentry
= tail_recursion_reentry
;
548 p
->arg_pointer_save_area
= arg_pointer_save_area
;
549 p
->rtl_expr_chain
= rtl_expr_chain
;
550 p
->last_parm_insn
= last_parm_insn
;
551 p
->context_display
= context_display
;
552 p
->trampoline_list
= trampoline_list
;
553 p
->function_call_count
= function_call_count
;
554 p
->temp_slots
= temp_slots
;
555 p
->temp_slot_level
= temp_slot_level
;
556 p
->target_temp_slot_level
= target_temp_slot_level
;
557 p
->var_temp_slot_level
= var_temp_slot_level
;
558 p
->fixup_var_refs_queue
= 0;
559 p
->epilogue_delay_list
= current_function_epilogue_delay_list
;
560 p
->args_info
= current_function_args_info
;
561 p
->check_memory_usage
= current_function_check_memory_usage
;
562 p
->instrument_entry_exit
= current_function_instrument_entry_exit
;
564 save_tree_status (p
, context
);
565 save_storage_status (p
);
566 save_emit_status (p
);
567 save_expr_status (p
);
568 save_stmt_status (p
);
569 save_varasm_status (p
, context
);
570 if (save_machine_status
)
571 (*save_machine_status
) (p
);
575 push_function_context ()
577 push_function_context_to (current_function_decl
);
580 /* Restore the last saved context, at the end of a nested function.
581 This function is called from language-specific code. */
584 pop_function_context_from (context
)
587 struct function
*p
= outer_function_chain
;
588 struct var_refs_queue
*queue
;
590 outer_function_chain
= p
->next
;
592 current_function_contains_functions
593 = p
->contains_functions
|| p
->inline_obstacks
594 || context
== current_function_decl
;
595 current_function_name
= p
->name
;
596 current_function_decl
= p
->decl
;
597 current_function_pops_args
= p
->pops_args
;
598 current_function_returns_struct
= p
->returns_struct
;
599 current_function_returns_pcc_struct
= p
->returns_pcc_struct
;
600 current_function_returns_pointer
= p
->returns_pointer
;
601 current_function_needs_context
= p
->needs_context
;
602 current_function_calls_setjmp
= p
->calls_setjmp
;
603 current_function_calls_longjmp
= p
->calls_longjmp
;
604 current_function_calls_alloca
= p
->calls_alloca
;
605 current_function_has_nonlocal_label
= p
->has_nonlocal_label
;
606 current_function_has_nonlocal_goto
= p
->has_nonlocal_goto
;
607 current_function_is_thunk
= p
->is_thunk
;
608 current_function_args_size
= p
->args_size
;
609 current_function_pretend_args_size
= p
->pretend_args_size
;
610 current_function_arg_offset_rtx
= p
->arg_offset_rtx
;
611 current_function_varargs
= p
->varargs
;
612 current_function_stdarg
= p
->stdarg
;
613 current_function_uses_const_pool
= p
->uses_const_pool
;
614 current_function_uses_pic_offset_table
= p
->uses_pic_offset_table
;
615 current_function_internal_arg_pointer
= p
->internal_arg_pointer
;
616 current_function_cannot_inline
= p
->cannot_inline
;
617 max_parm_reg
= p
->max_parm_reg
;
618 parm_reg_stack_loc
= p
->parm_reg_stack_loc
;
619 current_function_outgoing_args_size
= p
->outgoing_args_size
;
620 current_function_return_rtx
= p
->return_rtx
;
621 nonlocal_goto_handler_slots
= p
->nonlocal_goto_handler_slots
;
622 nonlocal_goto_stack_level
= p
->nonlocal_goto_stack_level
;
623 nonlocal_labels
= p
->nonlocal_labels
;
624 cleanup_label
= p
->cleanup_label
;
625 return_label
= p
->return_label
;
626 save_expr_regs
= p
->save_expr_regs
;
627 stack_slot_list
= p
->stack_slot_list
;
628 parm_birth_insn
= p
->parm_birth_insn
;
629 frame_offset
= p
->frame_offset
;
630 tail_recursion_label
= p
->tail_recursion_label
;
631 tail_recursion_reentry
= p
->tail_recursion_reentry
;
632 arg_pointer_save_area
= p
->arg_pointer_save_area
;
633 rtl_expr_chain
= p
->rtl_expr_chain
;
634 last_parm_insn
= p
->last_parm_insn
;
635 context_display
= p
->context_display
;
636 trampoline_list
= p
->trampoline_list
;
637 function_call_count
= p
->function_call_count
;
638 temp_slots
= p
->temp_slots
;
639 temp_slot_level
= p
->temp_slot_level
;
640 target_temp_slot_level
= p
->target_temp_slot_level
;
641 var_temp_slot_level
= p
->var_temp_slot_level
;
642 current_function_epilogue_delay_list
= p
->epilogue_delay_list
;
644 current_function_args_info
= p
->args_info
;
645 current_function_check_memory_usage
= p
->check_memory_usage
;
646 current_function_instrument_entry_exit
= p
->instrument_entry_exit
;
648 restore_tree_status (p
, context
);
649 restore_storage_status (p
);
650 restore_expr_status (p
);
651 restore_emit_status (p
);
652 restore_stmt_status (p
);
653 restore_varasm_status (p
);
655 if (restore_machine_status
)
656 (*restore_machine_status
) (p
);
658 /* Finish doing put_var_into_stack for any of our variables
659 which became addressable during the nested function. */
660 for (queue
= p
->fixup_var_refs_queue
; queue
; queue
= queue
->next
)
661 fixup_var_refs (queue
->modified
, queue
->promoted_mode
, queue
->unsignedp
);
665 /* Reset variables that have known state during rtx generation. */
666 rtx_equal_function_value_matters
= 1;
667 virtuals_instantiated
= 0;
670 void pop_function_context ()
672 pop_function_context_from (current_function_decl
);
675 /* Allocate fixed slots in the stack frame of the current function. */
677 /* Return size needed for stack frame based on slots so far allocated.
678 This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY;
679 the caller may have to do that. */
684 #ifdef FRAME_GROWS_DOWNWARD
685 return -frame_offset
;
691 /* Allocate a stack slot of SIZE bytes and return a MEM rtx for it
692 with machine mode MODE.
694 ALIGN controls the amount of alignment for the address of the slot:
695 0 means according to MODE,
696 -1 means use BIGGEST_ALIGNMENT and round size to multiple of that,
697 positive specifies alignment boundary in bits.
699 We do not round to stack_boundary here. */
702 assign_stack_local (mode
, size
, align
)
703 enum machine_mode mode
;
707 register rtx x
, addr
;
708 int bigend_correction
= 0;
713 alignment
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
715 alignment
= BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
;
717 else if (align
== -1)
719 alignment
= BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
;
720 size
= CEIL_ROUND (size
, alignment
);
723 alignment
= align
/ BITS_PER_UNIT
;
725 /* Round frame offset to that alignment.
726 We must be careful here, since FRAME_OFFSET might be negative and
727 division with a negative dividend isn't as well defined as we might
728 like. So we instead assume that ALIGNMENT is a power of two and
729 use logical operations which are unambiguous. */
730 #ifdef FRAME_GROWS_DOWNWARD
731 frame_offset
= FLOOR_ROUND (frame_offset
, alignment
);
733 frame_offset
= CEIL_ROUND (frame_offset
, alignment
);
736 /* On a big-endian machine, if we are allocating more space than we will use,
737 use the least significant bytes of those that are allocated. */
738 if (BYTES_BIG_ENDIAN
&& mode
!= BLKmode
)
739 bigend_correction
= size
- GET_MODE_SIZE (mode
);
741 #ifdef FRAME_GROWS_DOWNWARD
742 frame_offset
-= size
;
745 /* If we have already instantiated virtual registers, return the actual
746 address relative to the frame pointer. */
747 if (virtuals_instantiated
)
748 addr
= plus_constant (frame_pointer_rtx
,
749 (frame_offset
+ bigend_correction
750 + STARTING_FRAME_OFFSET
));
752 addr
= plus_constant (virtual_stack_vars_rtx
,
753 frame_offset
+ bigend_correction
);
755 #ifndef FRAME_GROWS_DOWNWARD
756 frame_offset
+= size
;
759 x
= gen_rtx_MEM (mode
, addr
);
761 stack_slot_list
= gen_rtx_EXPR_LIST (VOIDmode
, x
, stack_slot_list
);
766 /* Assign a stack slot in a containing function.
767 First three arguments are same as in preceding function.
768 The last argument specifies the function to allocate in. */
771 assign_outer_stack_local (mode
, size
, align
, function
)
772 enum machine_mode mode
;
775 struct function
*function
;
777 register rtx x
, addr
;
778 int bigend_correction
= 0;
781 /* Allocate in the memory associated with the function in whose frame
783 push_obstacks (function
->function_obstack
,
784 function
->function_maybepermanent_obstack
);
788 alignment
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
790 alignment
= BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
;
792 else if (align
== -1)
794 alignment
= BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
;
795 size
= CEIL_ROUND (size
, alignment
);
798 alignment
= align
/ BITS_PER_UNIT
;
800 /* Round frame offset to that alignment. */
801 #ifdef FRAME_GROWS_DOWNWARD
802 function
->frame_offset
= FLOOR_ROUND (function
->frame_offset
, alignment
);
804 function
->frame_offset
= CEIL_ROUND (function
->frame_offset
, alignment
);
807 /* On a big-endian machine, if we are allocating more space than we will use,
808 use the least significant bytes of those that are allocated. */
809 if (BYTES_BIG_ENDIAN
&& mode
!= BLKmode
)
810 bigend_correction
= size
- GET_MODE_SIZE (mode
);
812 #ifdef FRAME_GROWS_DOWNWARD
813 function
->frame_offset
-= size
;
815 addr
= plus_constant (virtual_stack_vars_rtx
,
816 function
->frame_offset
+ bigend_correction
);
817 #ifndef FRAME_GROWS_DOWNWARD
818 function
->frame_offset
+= size
;
821 x
= gen_rtx_MEM (mode
, addr
);
823 function
->stack_slot_list
824 = gen_rtx_EXPR_LIST (VOIDmode
, x
, function
->stack_slot_list
);
831 /* Allocate a temporary stack slot and record it for possible later
834 MODE is the machine mode to be given to the returned rtx.
836 SIZE is the size in units of the space required. We do no rounding here
837 since assign_stack_local will do any required rounding.
839 KEEP is 1 if this slot is to be retained after a call to
840 free_temp_slots. Automatic variables for a block are allocated
841 with this flag. KEEP is 2 if we allocate a longer term temporary,
842 whose lifetime is controlled by CLEANUP_POINT_EXPRs. KEEP is 3
843 if we are to allocate something at an inner level to be treated as
844 a variable in the block (e.g., a SAVE_EXPR). */
847 assign_stack_temp (mode
, size
, keep
)
848 enum machine_mode mode
;
852 struct temp_slot
*p
, *best_p
= 0;
854 /* If SIZE is -1 it means that somebody tried to allocate a temporary
855 of a variable size. */
859 /* First try to find an available, already-allocated temporary that is the
860 exact size we require. */
861 for (p
= temp_slots
; p
; p
= p
->next
)
862 if (p
->size
== size
&& GET_MODE (p
->slot
) == mode
&& ! p
->in_use
)
865 /* If we didn't find, one, try one that is larger than what we want. We
866 find the smallest such. */
868 for (p
= temp_slots
; p
; p
= p
->next
)
869 if (p
->size
> size
&& GET_MODE (p
->slot
) == mode
&& ! p
->in_use
870 && (best_p
== 0 || best_p
->size
> p
->size
))
873 /* Make our best, if any, the one to use. */
876 /* If there are enough aligned bytes left over, make them into a new
877 temp_slot so that the extra bytes don't get wasted. Do this only
878 for BLKmode slots, so that we can be sure of the alignment. */
879 if (GET_MODE (best_p
->slot
) == BLKmode
)
881 int alignment
= BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
;
882 HOST_WIDE_INT rounded_size
= CEIL_ROUND (size
, alignment
);
884 if (best_p
->size
- rounded_size
>= alignment
)
886 p
= (struct temp_slot
*) oballoc (sizeof (struct temp_slot
));
887 p
->in_use
= p
->addr_taken
= 0;
888 p
->size
= best_p
->size
- rounded_size
;
889 p
->base_offset
= best_p
->base_offset
+ rounded_size
;
890 p
->full_size
= best_p
->full_size
- rounded_size
;
891 p
->slot
= gen_rtx_MEM (BLKmode
,
892 plus_constant (XEXP (best_p
->slot
, 0),
896 p
->next
= temp_slots
;
899 stack_slot_list
= gen_rtx_EXPR_LIST (VOIDmode
, p
->slot
,
902 best_p
->size
= rounded_size
;
903 best_p
->full_size
= rounded_size
;
910 /* If we still didn't find one, make a new temporary. */
913 HOST_WIDE_INT frame_offset_old
= frame_offset
;
915 p
= (struct temp_slot
*) oballoc (sizeof (struct temp_slot
));
917 /* If the temp slot mode doesn't indicate the alignment,
918 use the largest possible, so no one will be disappointed. */
919 p
->slot
= assign_stack_local (mode
, size
, mode
== BLKmode
? -1 : 0);
921 /* The following slot size computation is necessary because we don't
922 know the actual size of the temporary slot until assign_stack_local
923 has performed all the frame alignment and size rounding for the
924 requested temporary. Note that extra space added for alignment
925 can be either above or below this stack slot depending on which
926 way the frame grows. We include the extra space if and only if it
927 is above this slot. */
928 #ifdef FRAME_GROWS_DOWNWARD
929 p
->size
= frame_offset_old
- frame_offset
;
934 /* Now define the fields used by combine_temp_slots. */
935 #ifdef FRAME_GROWS_DOWNWARD
936 p
->base_offset
= frame_offset
;
937 p
->full_size
= frame_offset_old
- frame_offset
;
939 p
->base_offset
= frame_offset_old
;
940 p
->full_size
= frame_offset
- frame_offset_old
;
943 p
->next
= temp_slots
;
949 p
->rtl_expr
= sequence_rtl_expr
;
953 p
->level
= target_temp_slot_level
;
958 p
->level
= var_temp_slot_level
;
963 p
->level
= temp_slot_level
;
967 /* We may be reusing an old slot, so clear any MEM flags that may have been
969 RTX_UNCHANGING_P (p
->slot
) = 0;
970 MEM_IN_STRUCT_P (p
->slot
) = 0;
971 MEM_SCALAR_P (p
->slot
) = 0;
972 MEM_ALIAS_SET (p
->slot
) = 0;
976 /* Assign a temporary of given TYPE.
977 KEEP is as for assign_stack_temp.
978 MEMORY_REQUIRED is 1 if the result must be addressable stack memory;
979 it is 0 if a register is OK.
980 DONT_PROMOTE is 1 if we should not promote values in register
984 assign_temp (type
, keep
, memory_required
, dont_promote
)
990 enum machine_mode mode
= TYPE_MODE (type
);
991 int unsignedp
= TREE_UNSIGNED (type
);
993 if (mode
== BLKmode
|| memory_required
)
995 HOST_WIDE_INT size
= int_size_in_bytes (type
);
998 /* Unfortunately, we don't yet know how to allocate variable-sized
999 temporaries. However, sometimes we have a fixed upper limit on
1000 the size (which is stored in TYPE_ARRAY_MAX_SIZE) and can use that
1001 instead. This is the case for Chill variable-sized strings. */
1002 if (size
== -1 && TREE_CODE (type
) == ARRAY_TYPE
1003 && TYPE_ARRAY_MAX_SIZE (type
) != NULL_TREE
1004 && TREE_CODE (TYPE_ARRAY_MAX_SIZE (type
)) == INTEGER_CST
)
1005 size
= TREE_INT_CST_LOW (TYPE_ARRAY_MAX_SIZE (type
));
1007 tmp
= assign_stack_temp (mode
, size
, keep
);
1008 MEM_SET_IN_STRUCT_P (tmp
, AGGREGATE_TYPE_P (type
));
1012 #ifndef PROMOTE_FOR_CALL_ONLY
1014 mode
= promote_mode (type
, mode
, &unsignedp
, 0);
1017 return gen_reg_rtx (mode
);
1020 /* Combine temporary stack slots which are adjacent on the stack.
1022 This allows for better use of already allocated stack space. This is only
1023 done for BLKmode slots because we can be sure that we won't have alignment
1024 problems in this case. */
1027 combine_temp_slots ()
1029 struct temp_slot
*p
, *q
;
1030 struct temp_slot
*prev_p
, *prev_q
;
1033 /* If there are a lot of temp slots, don't do anything unless
1034 high levels of optimizaton. */
1035 if (! flag_expensive_optimizations
)
1036 for (p
= temp_slots
, num_slots
= 0; p
; p
= p
->next
, num_slots
++)
1037 if (num_slots
> 100 || (num_slots
> 10 && optimize
== 0))
1040 for (p
= temp_slots
, prev_p
= 0; p
; p
= prev_p
? prev_p
->next
: temp_slots
)
1044 if (! p
->in_use
&& GET_MODE (p
->slot
) == BLKmode
)
1045 for (q
= p
->next
, prev_q
= p
; q
; q
= prev_q
->next
)
1048 if (! q
->in_use
&& GET_MODE (q
->slot
) == BLKmode
)
1050 if (p
->base_offset
+ p
->full_size
== q
->base_offset
)
1052 /* Q comes after P; combine Q into P. */
1054 p
->full_size
+= q
->full_size
;
1057 else if (q
->base_offset
+ q
->full_size
== p
->base_offset
)
1059 /* P comes after Q; combine P into Q. */
1061 q
->full_size
+= p
->full_size
;
1066 /* Either delete Q or advance past it. */
1068 prev_q
->next
= q
->next
;
1072 /* Either delete P or advance past it. */
1076 prev_p
->next
= p
->next
;
1078 temp_slots
= p
->next
;
1085 /* Find the temp slot corresponding to the object at address X. */
1087 static struct temp_slot
*
1088 find_temp_slot_from_address (x
)
1091 struct temp_slot
*p
;
1094 for (p
= temp_slots
; p
; p
= p
->next
)
1099 else if (XEXP (p
->slot
, 0) == x
1101 || (GET_CODE (x
) == PLUS
1102 && XEXP (x
, 0) == virtual_stack_vars_rtx
1103 && GET_CODE (XEXP (x
, 1)) == CONST_INT
1104 && INTVAL (XEXP (x
, 1)) >= p
->base_offset
1105 && INTVAL (XEXP (x
, 1)) < p
->base_offset
+ p
->full_size
))
1108 else if (p
->address
!= 0 && GET_CODE (p
->address
) == EXPR_LIST
)
1109 for (next
= p
->address
; next
; next
= XEXP (next
, 1))
1110 if (XEXP (next
, 0) == x
)
1117 /* Indicate that NEW is an alternate way of referring to the temp slot
1118 that previously was known by OLD. */
1121 update_temp_slot_address (old
, new)
1124 struct temp_slot
*p
= find_temp_slot_from_address (old
);
1126 /* If none, return. Else add NEW as an alias. */
1129 else if (p
->address
== 0)
1133 if (GET_CODE (p
->address
) != EXPR_LIST
)
1134 p
->address
= gen_rtx_EXPR_LIST (VOIDmode
, p
->address
, NULL_RTX
);
1136 p
->address
= gen_rtx_EXPR_LIST (VOIDmode
, new, p
->address
);
1140 /* If X could be a reference to a temporary slot, mark the fact that its
1141 address was taken. */
1144 mark_temp_addr_taken (x
)
1147 struct temp_slot
*p
;
1152 /* If X is not in memory or is at a constant address, it cannot be in
1153 a temporary slot. */
1154 if (GET_CODE (x
) != MEM
|| CONSTANT_P (XEXP (x
, 0)))
1157 p
= find_temp_slot_from_address (XEXP (x
, 0));
1162 /* If X could be a reference to a temporary slot, mark that slot as
1163 belonging to the to one level higher than the current level. If X
1164 matched one of our slots, just mark that one. Otherwise, we can't
1165 easily predict which it is, so upgrade all of them. Kept slots
1166 need not be touched.
1168 This is called when an ({...}) construct occurs and a statement
1169 returns a value in memory. */
1172 preserve_temp_slots (x
)
1175 struct temp_slot
*p
= 0;
1177 /* If there is no result, we still might have some objects whose address
1178 were taken, so we need to make sure they stay around. */
1181 for (p
= temp_slots
; p
; p
= p
->next
)
1182 if (p
->in_use
&& p
->level
== temp_slot_level
&& p
->addr_taken
)
1188 /* If X is a register that is being used as a pointer, see if we have
1189 a temporary slot we know it points to. To be consistent with
1190 the code below, we really should preserve all non-kept slots
1191 if we can't find a match, but that seems to be much too costly. */
1192 if (GET_CODE (x
) == REG
&& REGNO_POINTER_FLAG (REGNO (x
)))
1193 p
= find_temp_slot_from_address (x
);
1195 /* If X is not in memory or is at a constant address, it cannot be in
1196 a temporary slot, but it can contain something whose address was
1198 if (p
== 0 && (GET_CODE (x
) != MEM
|| CONSTANT_P (XEXP (x
, 0))))
1200 for (p
= temp_slots
; p
; p
= p
->next
)
1201 if (p
->in_use
&& p
->level
== temp_slot_level
&& p
->addr_taken
)
1207 /* First see if we can find a match. */
1209 p
= find_temp_slot_from_address (XEXP (x
, 0));
1213 /* Move everything at our level whose address was taken to our new
1214 level in case we used its address. */
1215 struct temp_slot
*q
;
1217 if (p
->level
== temp_slot_level
)
1219 for (q
= temp_slots
; q
; q
= q
->next
)
1220 if (q
!= p
&& q
->addr_taken
&& q
->level
== p
->level
)
1229 /* Otherwise, preserve all non-kept slots at this level. */
1230 for (p
= temp_slots
; p
; p
= p
->next
)
1231 if (p
->in_use
&& p
->level
== temp_slot_level
&& ! p
->keep
)
1235 /* X is the result of an RTL_EXPR. If it is a temporary slot associated
1236 with that RTL_EXPR, promote it into a temporary slot at the present
1237 level so it will not be freed when we free slots made in the
1241 preserve_rtl_expr_result (x
)
1244 struct temp_slot
*p
;
1246 /* If X is not in memory or is at a constant address, it cannot be in
1247 a temporary slot. */
1248 if (x
== 0 || GET_CODE (x
) != MEM
|| CONSTANT_P (XEXP (x
, 0)))
1251 /* If we can find a match, move it to our level unless it is already at
1253 p
= find_temp_slot_from_address (XEXP (x
, 0));
1256 p
->level
= MIN (p
->level
, temp_slot_level
);
1263 /* Free all temporaries used so far. This is normally called at the end
1264 of generating code for a statement. Don't free any temporaries
1265 currently in use for an RTL_EXPR that hasn't yet been emitted.
1266 We could eventually do better than this since it can be reused while
1267 generating the same RTL_EXPR, but this is complex and probably not
1273 struct temp_slot
*p
;
1275 for (p
= temp_slots
; p
; p
= p
->next
)
1276 if (p
->in_use
&& p
->level
== temp_slot_level
&& ! p
->keep
1277 && p
->rtl_expr
== 0)
1280 combine_temp_slots ();
1283 /* Free all temporary slots used in T, an RTL_EXPR node. */
1286 free_temps_for_rtl_expr (t
)
1289 struct temp_slot
*p
;
1291 for (p
= temp_slots
; p
; p
= p
->next
)
1292 if (p
->rtl_expr
== t
)
1295 combine_temp_slots ();
1298 /* Mark all temporaries ever allocated in this function as not suitable
1299 for reuse until the current level is exited. */
1302 mark_all_temps_used ()
1304 struct temp_slot
*p
;
1306 for (p
= temp_slots
; p
; p
= p
->next
)
1308 p
->in_use
= p
->keep
= 1;
1309 p
->level
= MIN (p
->level
, temp_slot_level
);
1313 /* Push deeper into the nesting level for stack temporaries. */
1321 /* Likewise, but save the new level as the place to allocate variables
1325 push_temp_slots_for_block ()
1329 var_temp_slot_level
= temp_slot_level
;
1332 /* Likewise, but save the new level as the place to allocate temporaries
1333 for TARGET_EXPRs. */
1336 push_temp_slots_for_target ()
1340 target_temp_slot_level
= temp_slot_level
;
1343 /* Set and get the value of target_temp_slot_level. The only
1344 permitted use of these functions is to save and restore this value. */
1347 get_target_temp_slot_level ()
1349 return target_temp_slot_level
;
1353 set_target_temp_slot_level (level
)
1356 target_temp_slot_level
= level
;
1359 /* Pop a temporary nesting level. All slots in use in the current level
1365 struct temp_slot
*p
;
1367 for (p
= temp_slots
; p
; p
= p
->next
)
1368 if (p
->in_use
&& p
->level
== temp_slot_level
&& p
->rtl_expr
== 0)
1371 combine_temp_slots ();
1376 /* Initialize temporary slots. */
1381 /* We have not allocated any temporaries yet. */
1383 temp_slot_level
= 0;
1384 var_temp_slot_level
= 0;
1385 target_temp_slot_level
= 0;
1388 /* Retroactively move an auto variable from a register to a stack slot.
1389 This is done when an address-reference to the variable is seen. */
1392 put_var_into_stack (decl
)
1396 enum machine_mode promoted_mode
, decl_mode
;
1397 struct function
*function
= 0;
1399 int can_use_addressof
;
1401 context
= decl_function_context (decl
);
1403 /* Get the current rtl used for this object and its original mode. */
1404 reg
= TREE_CODE (decl
) == SAVE_EXPR
? SAVE_EXPR_RTL (decl
) : DECL_RTL (decl
);
1406 /* No need to do anything if decl has no rtx yet
1407 since in that case caller is setting TREE_ADDRESSABLE
1408 and a stack slot will be assigned when the rtl is made. */
1412 /* Get the declared mode for this object. */
1413 decl_mode
= (TREE_CODE (decl
) == SAVE_EXPR
? TYPE_MODE (TREE_TYPE (decl
))
1414 : DECL_MODE (decl
));
1415 /* Get the mode it's actually stored in. */
1416 promoted_mode
= GET_MODE (reg
);
1418 /* If this variable comes from an outer function,
1419 find that function's saved context. */
1420 if (context
!= current_function_decl
&& context
!= inline_function_decl
)
1421 for (function
= outer_function_chain
; function
; function
= function
->next
)
1422 if (function
->decl
== context
)
1425 /* If this is a variable-size object with a pseudo to address it,
1426 put that pseudo into the stack, if the var is nonlocal. */
1427 if (DECL_NONLOCAL (decl
)
1428 && GET_CODE (reg
) == MEM
1429 && GET_CODE (XEXP (reg
, 0)) == REG
1430 && REGNO (XEXP (reg
, 0)) > LAST_VIRTUAL_REGISTER
)
1432 reg
= XEXP (reg
, 0);
1433 decl_mode
= promoted_mode
= GET_MODE (reg
);
1439 /* FIXME make it work for promoted modes too */
1440 && decl_mode
== promoted_mode
1441 #ifdef NON_SAVING_SETJMP
1442 && ! (NON_SAVING_SETJMP
&& current_function_calls_setjmp
)
1446 /* If we can't use ADDRESSOF, make sure we see through one we already
1448 if (! can_use_addressof
&& GET_CODE (reg
) == MEM
1449 && GET_CODE (XEXP (reg
, 0)) == ADDRESSOF
)
1450 reg
= XEXP (XEXP (reg
, 0), 0);
1452 /* Now we should have a value that resides in one or more pseudo regs. */
1454 if (GET_CODE (reg
) == REG
)
1456 /* If this variable lives in the current function and we don't need
1457 to put things in the stack for the sake of setjmp, try to keep it
1458 in a register until we know we actually need the address. */
1459 if (can_use_addressof
)
1460 gen_mem_addressof (reg
, decl
);
1462 put_reg_into_stack (function
, reg
, TREE_TYPE (decl
),
1463 promoted_mode
, decl_mode
,
1464 TREE_SIDE_EFFECTS (decl
), 0,
1466 || DECL_INITIAL (decl
) != 0);
1468 else if (GET_CODE (reg
) == CONCAT
)
1470 /* A CONCAT contains two pseudos; put them both in the stack.
1471 We do it so they end up consecutive. */
1472 enum machine_mode part_mode
= GET_MODE (XEXP (reg
, 0));
1473 tree part_type
= TREE_TYPE (TREE_TYPE (decl
));
1474 #ifdef FRAME_GROWS_DOWNWARD
1475 /* Since part 0 should have a lower address, do it second. */
1476 put_reg_into_stack (function
, XEXP (reg
, 1), part_type
, part_mode
,
1477 part_mode
, TREE_SIDE_EFFECTS (decl
), 0,
1478 TREE_USED (decl
) || DECL_INITIAL (decl
) != 0);
1479 put_reg_into_stack (function
, XEXP (reg
, 0), part_type
, part_mode
,
1480 part_mode
, TREE_SIDE_EFFECTS (decl
), 0,
1481 TREE_USED (decl
) || DECL_INITIAL (decl
) != 0);
1483 put_reg_into_stack (function
, XEXP (reg
, 0), part_type
, part_mode
,
1484 part_mode
, TREE_SIDE_EFFECTS (decl
), 0,
1485 TREE_USED (decl
) || DECL_INITIAL (decl
) != 0);
1486 put_reg_into_stack (function
, XEXP (reg
, 1), part_type
, part_mode
,
1487 part_mode
, TREE_SIDE_EFFECTS (decl
), 0,
1488 TREE_USED (decl
) || DECL_INITIAL (decl
) != 0);
1491 /* Change the CONCAT into a combined MEM for both parts. */
1492 PUT_CODE (reg
, MEM
);
1493 MEM_VOLATILE_P (reg
) = MEM_VOLATILE_P (XEXP (reg
, 0));
1494 MEM_ALIAS_SET (reg
) = get_alias_set (decl
);
1496 /* The two parts are in memory order already.
1497 Use the lower parts address as ours. */
1498 XEXP (reg
, 0) = XEXP (XEXP (reg
, 0), 0);
1499 /* Prevent sharing of rtl that might lose. */
1500 if (GET_CODE (XEXP (reg
, 0)) == PLUS
)
1501 XEXP (reg
, 0) = copy_rtx (XEXP (reg
, 0));
1506 if (current_function_check_memory_usage
)
1507 emit_library_call (chkr_set_right_libfunc
, 1, VOIDmode
, 3,
1508 XEXP (reg
, 0), ptr_mode
,
1509 GEN_INT (GET_MODE_SIZE (GET_MODE (reg
))),
1510 TYPE_MODE (sizetype
),
1511 GEN_INT (MEMORY_USE_RW
),
1512 TYPE_MODE (integer_type_node
));
1515 /* Subroutine of put_var_into_stack. This puts a single pseudo reg REG
1516 into the stack frame of FUNCTION (0 means the current function).
1517 DECL_MODE is the machine mode of the user-level data type.
1518 PROMOTED_MODE is the machine mode of the register.
1519 VOLATILE_P is nonzero if this is for a "volatile" decl.
1520 USED_P is nonzero if this reg might have already been used in an insn. */
1523 put_reg_into_stack (function
, reg
, type
, promoted_mode
, decl_mode
, volatile_p
,
1524 original_regno
, used_p
)
1525 struct function
*function
;
1528 enum machine_mode promoted_mode
, decl_mode
;
1534 int regno
= original_regno
;
1537 regno
= REGNO (reg
);
1541 if (regno
< function
->max_parm_reg
)
1542 new = function
->parm_reg_stack_loc
[regno
];
1544 new = assign_outer_stack_local (decl_mode
, GET_MODE_SIZE (decl_mode
),
1549 if (regno
< max_parm_reg
)
1550 new = parm_reg_stack_loc
[regno
];
1552 new = assign_stack_local (decl_mode
, GET_MODE_SIZE (decl_mode
), 0);
1555 PUT_MODE (reg
, decl_mode
);
1556 XEXP (reg
, 0) = XEXP (new, 0);
1557 /* `volatil' bit means one thing for MEMs, another entirely for REGs. */
1558 MEM_VOLATILE_P (reg
) = volatile_p
;
1559 PUT_CODE (reg
, MEM
);
1561 /* If this is a memory ref that contains aggregate components,
1562 mark it as such for cse and loop optimize. If we are reusing a
1563 previously generated stack slot, then we need to copy the bit in
1564 case it was set for other reasons. For instance, it is set for
1565 __builtin_va_alist. */
1566 MEM_SET_IN_STRUCT_P (reg
,
1567 AGGREGATE_TYPE_P (type
) || MEM_IN_STRUCT_P (new));
1568 MEM_ALIAS_SET (reg
) = get_alias_set (type
);
1570 /* Now make sure that all refs to the variable, previously made
1571 when it was a register, are fixed up to be valid again. */
1573 if (used_p
&& function
!= 0)
1575 struct var_refs_queue
*temp
;
1577 /* Variable is inherited; fix it up when we get back to its function. */
1578 push_obstacks (function
->function_obstack
,
1579 function
->function_maybepermanent_obstack
);
1581 /* See comment in restore_tree_status in tree.c for why this needs to be
1582 on saveable obstack. */
1584 = (struct var_refs_queue
*) savealloc (sizeof (struct var_refs_queue
));
1585 temp
->modified
= reg
;
1586 temp
->promoted_mode
= promoted_mode
;
1587 temp
->unsignedp
= TREE_UNSIGNED (type
);
1588 temp
->next
= function
->fixup_var_refs_queue
;
1589 function
->fixup_var_refs_queue
= temp
;
1593 /* Variable is local; fix it up now. */
1594 fixup_var_refs (reg
, promoted_mode
, TREE_UNSIGNED (type
));
1598 fixup_var_refs (var
, promoted_mode
, unsignedp
)
1600 enum machine_mode promoted_mode
;
1604 rtx first_insn
= get_insns ();
1605 struct sequence_stack
*stack
= sequence_stack
;
1606 tree rtl_exps
= rtl_expr_chain
;
1608 /* Must scan all insns for stack-refs that exceed the limit. */
1609 fixup_var_refs_insns (var
, promoted_mode
, unsignedp
, first_insn
, stack
== 0);
1611 /* Scan all pending sequences too. */
1612 for (; stack
; stack
= stack
->next
)
1614 push_to_sequence (stack
->first
);
1615 fixup_var_refs_insns (var
, promoted_mode
, unsignedp
,
1616 stack
->first
, stack
->next
!= 0);
1617 /* Update remembered end of sequence
1618 in case we added an insn at the end. */
1619 stack
->last
= get_last_insn ();
1623 /* Scan all waiting RTL_EXPRs too. */
1624 for (pending
= rtl_exps
; pending
; pending
= TREE_CHAIN (pending
))
1626 rtx seq
= RTL_EXPR_SEQUENCE (TREE_VALUE (pending
));
1627 if (seq
!= const0_rtx
&& seq
!= 0)
1629 push_to_sequence (seq
);
1630 fixup_var_refs_insns (var
, promoted_mode
, unsignedp
, seq
, 0);
1636 /* REPLACEMENTS is a pointer to a list of the struct fixup_replacement and X is
1637 some part of an insn. Return a struct fixup_replacement whose OLD
1638 value is equal to X. Allocate a new structure if no such entry exists. */
1640 static struct fixup_replacement
*
1641 find_fixup_replacement (replacements
, x
)
1642 struct fixup_replacement
**replacements
;
1645 struct fixup_replacement
*p
;
1647 /* See if we have already replaced this. */
1648 for (p
= *replacements
; p
&& p
->old
!= x
; p
= p
->next
)
1653 p
= (struct fixup_replacement
*) oballoc (sizeof (struct fixup_replacement
));
1656 p
->next
= *replacements
;
1663 /* Scan the insn-chain starting with INSN for refs to VAR
1664 and fix them up. TOPLEVEL is nonzero if this chain is the
1665 main chain of insns for the current function. */
1668 fixup_var_refs_insns (var
, promoted_mode
, unsignedp
, insn
, toplevel
)
1670 enum machine_mode promoted_mode
;
1679 rtx next
= NEXT_INSN (insn
);
1680 rtx set
, prev
, prev_set
;
1683 if (GET_RTX_CLASS (GET_CODE (insn
)) == 'i')
1685 /* If this is a CLOBBER of VAR, delete it.
1687 If it has a REG_LIBCALL note, delete the REG_LIBCALL
1688 and REG_RETVAL notes too. */
1689 if (GET_CODE (PATTERN (insn
)) == CLOBBER
1690 && (XEXP (PATTERN (insn
), 0) == var
1691 || (GET_CODE (XEXP (PATTERN (insn
), 0)) == CONCAT
1692 && (XEXP (XEXP (PATTERN (insn
), 0), 0) == var
1693 || XEXP (XEXP (PATTERN (insn
), 0), 1) == var
))))
1695 if ((note
= find_reg_note (insn
, REG_LIBCALL
, NULL_RTX
)) != 0)
1696 /* The REG_LIBCALL note will go away since we are going to
1697 turn INSN into a NOTE, so just delete the
1698 corresponding REG_RETVAL note. */
1699 remove_note (XEXP (note
, 0),
1700 find_reg_note (XEXP (note
, 0), REG_RETVAL
,
1703 /* In unoptimized compilation, we shouldn't call delete_insn
1704 except in jump.c doing warnings. */
1705 PUT_CODE (insn
, NOTE
);
1706 NOTE_LINE_NUMBER (insn
) = NOTE_INSN_DELETED
;
1707 NOTE_SOURCE_FILE (insn
) = 0;
1710 /* The insn to load VAR from a home in the arglist
1711 is now a no-op. When we see it, just delete it.
1712 Similarly if this is storing VAR from a register from which
1713 it was loaded in the previous insn. This will occur
1714 when an ADDRESSOF was made for an arglist slot. */
1716 && (set
= single_set (insn
)) != 0
1717 && SET_DEST (set
) == var
1718 /* If this represents the result of an insn group,
1719 don't delete the insn. */
1720 && find_reg_note (insn
, REG_RETVAL
, NULL_RTX
) == 0
1721 && (rtx_equal_p (SET_SRC (set
), var
)
1722 || (GET_CODE (SET_SRC (set
)) == REG
1723 && (prev
= prev_nonnote_insn (insn
)) != 0
1724 && (prev_set
= single_set (prev
)) != 0
1725 && SET_DEST (prev_set
) == SET_SRC (set
)
1726 && rtx_equal_p (SET_SRC (prev_set
), var
))))
1728 /* In unoptimized compilation, we shouldn't call delete_insn
1729 except in jump.c doing warnings. */
1730 PUT_CODE (insn
, NOTE
);
1731 NOTE_LINE_NUMBER (insn
) = NOTE_INSN_DELETED
;
1732 NOTE_SOURCE_FILE (insn
) = 0;
1733 if (insn
== last_parm_insn
)
1734 last_parm_insn
= PREV_INSN (next
);
1738 struct fixup_replacement
*replacements
= 0;
1739 rtx next_insn
= NEXT_INSN (insn
);
1741 if (SMALL_REGISTER_CLASSES
)
1743 /* If the insn that copies the results of a CALL_INSN
1744 into a pseudo now references VAR, we have to use an
1745 intermediate pseudo since we want the life of the
1746 return value register to be only a single insn.
1748 If we don't use an intermediate pseudo, such things as
1749 address computations to make the address of VAR valid
1750 if it is not can be placed between the CALL_INSN and INSN.
1752 To make sure this doesn't happen, we record the destination
1753 of the CALL_INSN and see if the next insn uses both that
1756 if (call_dest
!= 0 && GET_CODE (insn
) == INSN
1757 && reg_mentioned_p (var
, PATTERN (insn
))
1758 && reg_mentioned_p (call_dest
, PATTERN (insn
)))
1760 rtx temp
= gen_reg_rtx (GET_MODE (call_dest
));
1762 emit_insn_before (gen_move_insn (temp
, call_dest
), insn
);
1764 PATTERN (insn
) = replace_rtx (PATTERN (insn
),
1768 if (GET_CODE (insn
) == CALL_INSN
1769 && GET_CODE (PATTERN (insn
)) == SET
)
1770 call_dest
= SET_DEST (PATTERN (insn
));
1771 else if (GET_CODE (insn
) == CALL_INSN
1772 && GET_CODE (PATTERN (insn
)) == PARALLEL
1773 && GET_CODE (XVECEXP (PATTERN (insn
), 0, 0)) == SET
)
1774 call_dest
= SET_DEST (XVECEXP (PATTERN (insn
), 0, 0));
1779 /* See if we have to do anything to INSN now that VAR is in
1780 memory. If it needs to be loaded into a pseudo, use a single
1781 pseudo for the entire insn in case there is a MATCH_DUP
1782 between two operands. We pass a pointer to the head of
1783 a list of struct fixup_replacements. If fixup_var_refs_1
1784 needs to allocate pseudos or replacement MEMs (for SUBREGs),
1785 it will record them in this list.
1787 If it allocated a pseudo for any replacement, we copy into
1790 fixup_var_refs_1 (var
, promoted_mode
, &PATTERN (insn
), insn
,
1793 /* If this is last_parm_insn, and any instructions were output
1794 after it to fix it up, then we must set last_parm_insn to
1795 the last such instruction emitted. */
1796 if (insn
== last_parm_insn
)
1797 last_parm_insn
= PREV_INSN (next_insn
);
1799 while (replacements
)
1801 if (GET_CODE (replacements
->new) == REG
)
1806 /* OLD might be a (subreg (mem)). */
1807 if (GET_CODE (replacements
->old
) == SUBREG
)
1809 = fixup_memory_subreg (replacements
->old
, insn
, 0);
1812 = fixup_stack_1 (replacements
->old
, insn
);
1814 insert_before
= insn
;
1816 /* If we are changing the mode, do a conversion.
1817 This might be wasteful, but combine.c will
1818 eliminate much of the waste. */
1820 if (GET_MODE (replacements
->new)
1821 != GET_MODE (replacements
->old
))
1824 convert_move (replacements
->new,
1825 replacements
->old
, unsignedp
);
1826 seq
= gen_sequence ();
1830 seq
= gen_move_insn (replacements
->new,
1833 emit_insn_before (seq
, insert_before
);
1836 replacements
= replacements
->next
;
1840 /* Also fix up any invalid exprs in the REG_NOTES of this insn.
1841 But don't touch other insns referred to by reg-notes;
1842 we will get them elsewhere. */
1843 for (note
= REG_NOTES (insn
); note
; note
= XEXP (note
, 1))
1844 if (GET_CODE (note
) != INSN_LIST
)
1846 = walk_fixup_memory_subreg (XEXP (note
, 0), insn
, 1);
1852 /* VAR is a MEM that used to be a pseudo register with mode PROMOTED_MODE.
1853 See if the rtx expression at *LOC in INSN needs to be changed.
1855 REPLACEMENTS is a pointer to a list head that starts out zero, but may
1856 contain a list of original rtx's and replacements. If we find that we need
1857 to modify this insn by replacing a memory reference with a pseudo or by
1858 making a new MEM to implement a SUBREG, we consult that list to see if
1859 we have already chosen a replacement. If none has already been allocated,
1860 we allocate it and update the list. fixup_var_refs_insns will copy VAR
1861 or the SUBREG, as appropriate, to the pseudo. */
1864 fixup_var_refs_1 (var
, promoted_mode
, loc
, insn
, replacements
)
1866 enum machine_mode promoted_mode
;
1869 struct fixup_replacement
**replacements
;
1872 register rtx x
= *loc
;
1873 RTX_CODE code
= GET_CODE (x
);
1875 register rtx tem
, tem1
;
1876 struct fixup_replacement
*replacement
;
1881 if (XEXP (x
, 0) == var
)
1883 /* Prevent sharing of rtl that might lose. */
1884 rtx sub
= copy_rtx (XEXP (var
, 0));
1888 if (! validate_change (insn
, loc
, sub
, 0))
1890 rtx y
= force_operand (sub
, NULL_RTX
);
1892 if (! validate_change (insn
, loc
, y
, 0))
1893 *loc
= copy_to_reg (y
);
1896 emit_insn_before (gen_sequence (), insn
);
1904 /* If we already have a replacement, use it. Otherwise,
1905 try to fix up this address in case it is invalid. */
1907 replacement
= find_fixup_replacement (replacements
, var
);
1908 if (replacement
->new)
1910 *loc
= replacement
->new;
1914 *loc
= replacement
->new = x
= fixup_stack_1 (x
, insn
);
1916 /* Unless we are forcing memory to register or we changed the mode,
1917 we can leave things the way they are if the insn is valid. */
1919 INSN_CODE (insn
) = -1;
1920 if (! flag_force_mem
&& GET_MODE (x
) == promoted_mode
1921 && recog_memoized (insn
) >= 0)
1924 *loc
= replacement
->new = gen_reg_rtx (promoted_mode
);
1928 /* If X contains VAR, we need to unshare it here so that we update
1929 each occurrence separately. But all identical MEMs in one insn
1930 must be replaced with the same rtx because of the possibility of
1933 if (reg_mentioned_p (var
, x
))
1935 replacement
= find_fixup_replacement (replacements
, x
);
1936 if (replacement
->new == 0)
1937 replacement
->new = copy_most_rtx (x
, var
);
1939 *loc
= x
= replacement
->new;
1955 /* Note that in some cases those types of expressions are altered
1956 by optimize_bit_field, and do not survive to get here. */
1957 if (XEXP (x
, 0) == var
1958 || (GET_CODE (XEXP (x
, 0)) == SUBREG
1959 && SUBREG_REG (XEXP (x
, 0)) == var
))
1961 /* Get TEM as a valid MEM in the mode presently in the insn.
1963 We don't worry about the possibility of MATCH_DUP here; it
1964 is highly unlikely and would be tricky to handle. */
1967 if (GET_CODE (tem
) == SUBREG
)
1969 if (GET_MODE_BITSIZE (GET_MODE (tem
))
1970 > GET_MODE_BITSIZE (GET_MODE (var
)))
1972 replacement
= find_fixup_replacement (replacements
, var
);
1973 if (replacement
->new == 0)
1974 replacement
->new = gen_reg_rtx (GET_MODE (var
));
1975 SUBREG_REG (tem
) = replacement
->new;
1978 tem
= fixup_memory_subreg (tem
, insn
, 0);
1981 tem
= fixup_stack_1 (tem
, insn
);
1983 /* Unless we want to load from memory, get TEM into the proper mode
1984 for an extract from memory. This can only be done if the
1985 extract is at a constant position and length. */
1987 if (! flag_force_mem
&& GET_CODE (XEXP (x
, 1)) == CONST_INT
1988 && GET_CODE (XEXP (x
, 2)) == CONST_INT
1989 && ! mode_dependent_address_p (XEXP (tem
, 0))
1990 && ! MEM_VOLATILE_P (tem
))
1992 enum machine_mode wanted_mode
= VOIDmode
;
1993 enum machine_mode is_mode
= GET_MODE (tem
);
1994 HOST_WIDE_INT pos
= INTVAL (XEXP (x
, 2));
1997 if (GET_CODE (x
) == ZERO_EXTRACT
)
1999 wanted_mode
= insn_operand_mode
[(int) CODE_FOR_extzv
][1];
2000 if (wanted_mode
== VOIDmode
)
2001 wanted_mode
= word_mode
;
2005 if (GET_CODE (x
) == SIGN_EXTRACT
)
2007 wanted_mode
= insn_operand_mode
[(int) CODE_FOR_extv
][1];
2008 if (wanted_mode
== VOIDmode
)
2009 wanted_mode
= word_mode
;
2012 /* If we have a narrower mode, we can do something. */
2013 if (wanted_mode
!= VOIDmode
2014 && GET_MODE_SIZE (wanted_mode
) < GET_MODE_SIZE (is_mode
))
2016 HOST_WIDE_INT offset
= pos
/ BITS_PER_UNIT
;
2017 rtx old_pos
= XEXP (x
, 2);
2020 /* If the bytes and bits are counted differently, we
2021 must adjust the offset. */
2022 if (BYTES_BIG_ENDIAN
!= BITS_BIG_ENDIAN
)
2023 offset
= (GET_MODE_SIZE (is_mode
)
2024 - GET_MODE_SIZE (wanted_mode
) - offset
);
2026 pos
%= GET_MODE_BITSIZE (wanted_mode
);
2028 newmem
= gen_rtx_MEM (wanted_mode
,
2029 plus_constant (XEXP (tem
, 0), offset
));
2030 RTX_UNCHANGING_P (newmem
) = RTX_UNCHANGING_P (tem
);
2031 MEM_COPY_ATTRIBUTES (newmem
, tem
);
2033 /* Make the change and see if the insn remains valid. */
2034 INSN_CODE (insn
) = -1;
2035 XEXP (x
, 0) = newmem
;
2036 XEXP (x
, 2) = GEN_INT (pos
);
2038 if (recog_memoized (insn
) >= 0)
2041 /* Otherwise, restore old position. XEXP (x, 0) will be
2043 XEXP (x
, 2) = old_pos
;
2047 /* If we get here, the bitfield extract insn can't accept a memory
2048 reference. Copy the input into a register. */
2050 tem1
= gen_reg_rtx (GET_MODE (tem
));
2051 emit_insn_before (gen_move_insn (tem1
, tem
), insn
);
2058 if (SUBREG_REG (x
) == var
)
2060 /* If this is a special SUBREG made because VAR was promoted
2061 from a wider mode, replace it with VAR and call ourself
2062 recursively, this time saying that the object previously
2063 had its current mode (by virtue of the SUBREG). */
2065 if (SUBREG_PROMOTED_VAR_P (x
))
2068 fixup_var_refs_1 (var
, GET_MODE (var
), loc
, insn
, replacements
);
2072 /* If this SUBREG makes VAR wider, it has become a paradoxical
2073 SUBREG with VAR in memory, but these aren't allowed at this
2074 stage of the compilation. So load VAR into a pseudo and take
2075 a SUBREG of that pseudo. */
2076 if (GET_MODE_SIZE (GET_MODE (x
)) > GET_MODE_SIZE (GET_MODE (var
)))
2078 replacement
= find_fixup_replacement (replacements
, var
);
2079 if (replacement
->new == 0)
2080 replacement
->new = gen_reg_rtx (GET_MODE (var
));
2081 SUBREG_REG (x
) = replacement
->new;
2085 /* See if we have already found a replacement for this SUBREG.
2086 If so, use it. Otherwise, make a MEM and see if the insn
2087 is recognized. If not, or if we should force MEM into a register,
2088 make a pseudo for this SUBREG. */
2089 replacement
= find_fixup_replacement (replacements
, x
);
2090 if (replacement
->new)
2092 *loc
= replacement
->new;
2096 replacement
->new = *loc
= fixup_memory_subreg (x
, insn
, 0);
2098 INSN_CODE (insn
) = -1;
2099 if (! flag_force_mem
&& recog_memoized (insn
) >= 0)
2102 *loc
= replacement
->new = gen_reg_rtx (GET_MODE (x
));
2108 /* First do special simplification of bit-field references. */
2109 if (GET_CODE (SET_DEST (x
)) == SIGN_EXTRACT
2110 || GET_CODE (SET_DEST (x
)) == ZERO_EXTRACT
)
2111 optimize_bit_field (x
, insn
, 0);
2112 if (GET_CODE (SET_SRC (x
)) == SIGN_EXTRACT
2113 || GET_CODE (SET_SRC (x
)) == ZERO_EXTRACT
)
2114 optimize_bit_field (x
, insn
, NULL_PTR
);
2116 /* For a paradoxical SUBREG inside a ZERO_EXTRACT, load the object
2117 into a register and then store it back out. */
2118 if (GET_CODE (SET_DEST (x
)) == ZERO_EXTRACT
2119 && GET_CODE (XEXP (SET_DEST (x
), 0)) == SUBREG
2120 && SUBREG_REG (XEXP (SET_DEST (x
), 0)) == var
2121 && (GET_MODE_SIZE (GET_MODE (XEXP (SET_DEST (x
), 0)))
2122 > GET_MODE_SIZE (GET_MODE (var
))))
2124 replacement
= find_fixup_replacement (replacements
, var
);
2125 if (replacement
->new == 0)
2126 replacement
->new = gen_reg_rtx (GET_MODE (var
));
2128 SUBREG_REG (XEXP (SET_DEST (x
), 0)) = replacement
->new;
2129 emit_insn_after (gen_move_insn (var
, replacement
->new), insn
);
2132 /* If SET_DEST is now a paradoxical SUBREG, put the result of this
2133 insn into a pseudo and store the low part of the pseudo into VAR. */
2134 if (GET_CODE (SET_DEST (x
)) == SUBREG
2135 && SUBREG_REG (SET_DEST (x
)) == var
2136 && (GET_MODE_SIZE (GET_MODE (SET_DEST (x
)))
2137 > GET_MODE_SIZE (GET_MODE (var
))))
2139 SET_DEST (x
) = tem
= gen_reg_rtx (GET_MODE (SET_DEST (x
)));
2140 emit_insn_after (gen_move_insn (var
, gen_lowpart (GET_MODE (var
),
2147 rtx dest
= SET_DEST (x
);
2148 rtx src
= SET_SRC (x
);
2150 rtx outerdest
= dest
;
2153 while (GET_CODE (dest
) == SUBREG
|| GET_CODE (dest
) == STRICT_LOW_PART
2154 || GET_CODE (dest
) == SIGN_EXTRACT
2155 || GET_CODE (dest
) == ZERO_EXTRACT
)
2156 dest
= XEXP (dest
, 0);
2158 if (GET_CODE (src
) == SUBREG
)
2159 src
= XEXP (src
, 0);
2161 /* If VAR does not appear at the top level of the SET
2162 just scan the lower levels of the tree. */
2164 if (src
!= var
&& dest
!= var
)
2167 /* We will need to rerecognize this insn. */
2168 INSN_CODE (insn
) = -1;
2171 if (GET_CODE (outerdest
) == ZERO_EXTRACT
&& dest
== var
)
2173 /* Since this case will return, ensure we fixup all the
2175 fixup_var_refs_1 (var
, promoted_mode
, &XEXP (outerdest
, 1),
2176 insn
, replacements
);
2177 fixup_var_refs_1 (var
, promoted_mode
, &XEXP (outerdest
, 2),
2178 insn
, replacements
);
2179 fixup_var_refs_1 (var
, promoted_mode
, &SET_SRC (x
),
2180 insn
, replacements
);
2182 tem
= XEXP (outerdest
, 0);
2184 /* Clean up (SUBREG:SI (MEM:mode ...) 0)
2185 that may appear inside a ZERO_EXTRACT.
2186 This was legitimate when the MEM was a REG. */
2187 if (GET_CODE (tem
) == SUBREG
2188 && SUBREG_REG (tem
) == var
)
2189 tem
= fixup_memory_subreg (tem
, insn
, 0);
2191 tem
= fixup_stack_1 (tem
, insn
);
2193 if (GET_CODE (XEXP (outerdest
, 1)) == CONST_INT
2194 && GET_CODE (XEXP (outerdest
, 2)) == CONST_INT
2195 && ! mode_dependent_address_p (XEXP (tem
, 0))
2196 && ! MEM_VOLATILE_P (tem
))
2198 enum machine_mode wanted_mode
;
2199 enum machine_mode is_mode
= GET_MODE (tem
);
2200 HOST_WIDE_INT pos
= INTVAL (XEXP (outerdest
, 2));
2202 wanted_mode
= insn_operand_mode
[(int) CODE_FOR_insv
][0];
2203 if (wanted_mode
== VOIDmode
)
2204 wanted_mode
= word_mode
;
2206 /* If we have a narrower mode, we can do something. */
2207 if (GET_MODE_SIZE (wanted_mode
) < GET_MODE_SIZE (is_mode
))
2209 HOST_WIDE_INT offset
= pos
/ BITS_PER_UNIT
;
2210 rtx old_pos
= XEXP (outerdest
, 2);
2213 if (BYTES_BIG_ENDIAN
!= BITS_BIG_ENDIAN
)
2214 offset
= (GET_MODE_SIZE (is_mode
)
2215 - GET_MODE_SIZE (wanted_mode
) - offset
);
2217 pos
%= GET_MODE_BITSIZE (wanted_mode
);
2219 newmem
= gen_rtx_MEM (wanted_mode
,
2220 plus_constant (XEXP (tem
, 0), offset
));
2221 RTX_UNCHANGING_P (newmem
) = RTX_UNCHANGING_P (tem
);
2222 MEM_COPY_ATTRIBUTES (newmem
, tem
);
2224 /* Make the change and see if the insn remains valid. */
2225 INSN_CODE (insn
) = -1;
2226 XEXP (outerdest
, 0) = newmem
;
2227 XEXP (outerdest
, 2) = GEN_INT (pos
);
2229 if (recog_memoized (insn
) >= 0)
2232 /* Otherwise, restore old position. XEXP (x, 0) will be
2234 XEXP (outerdest
, 2) = old_pos
;
2238 /* If we get here, the bit-field store doesn't allow memory
2239 or isn't located at a constant position. Load the value into
2240 a register, do the store, and put it back into memory. */
2242 tem1
= gen_reg_rtx (GET_MODE (tem
));
2243 emit_insn_before (gen_move_insn (tem1
, tem
), insn
);
2244 emit_insn_after (gen_move_insn (tem
, tem1
), insn
);
2245 XEXP (outerdest
, 0) = tem1
;
2250 /* STRICT_LOW_PART is a no-op on memory references
2251 and it can cause combinations to be unrecognizable,
2254 if (dest
== var
&& GET_CODE (SET_DEST (x
)) == STRICT_LOW_PART
)
2255 SET_DEST (x
) = XEXP (SET_DEST (x
), 0);
2257 /* A valid insn to copy VAR into or out of a register
2258 must be left alone, to avoid an infinite loop here.
2259 If the reference to VAR is by a subreg, fix that up,
2260 since SUBREG is not valid for a memref.
2261 Also fix up the address of the stack slot.
2263 Note that we must not try to recognize the insn until
2264 after we know that we have valid addresses and no
2265 (subreg (mem ...) ...) constructs, since these interfere
2266 with determining the validity of the insn. */
2268 if ((SET_SRC (x
) == var
2269 || (GET_CODE (SET_SRC (x
)) == SUBREG
2270 && SUBREG_REG (SET_SRC (x
)) == var
))
2271 && (GET_CODE (SET_DEST (x
)) == REG
2272 || (GET_CODE (SET_DEST (x
)) == SUBREG
2273 && GET_CODE (SUBREG_REG (SET_DEST (x
))) == REG
))
2274 && GET_MODE (var
) == promoted_mode
2275 && x
== single_set (insn
))
2279 replacement
= find_fixup_replacement (replacements
, SET_SRC (x
));
2280 if (replacement
->new)
2281 SET_SRC (x
) = replacement
->new;
2282 else if (GET_CODE (SET_SRC (x
)) == SUBREG
)
2283 SET_SRC (x
) = replacement
->new
2284 = fixup_memory_subreg (SET_SRC (x
), insn
, 0);
2286 SET_SRC (x
) = replacement
->new
2287 = fixup_stack_1 (SET_SRC (x
), insn
);
2289 if (recog_memoized (insn
) >= 0)
2292 /* INSN is not valid, but we know that we want to
2293 copy SET_SRC (x) to SET_DEST (x) in some way. So
2294 we generate the move and see whether it requires more
2295 than one insn. If it does, we emit those insns and
2296 delete INSN. Otherwise, we an just replace the pattern
2297 of INSN; we have already verified above that INSN has
2298 no other function that to do X. */
2300 pat
= gen_move_insn (SET_DEST (x
), SET_SRC (x
));
2301 if (GET_CODE (pat
) == SEQUENCE
)
2303 emit_insn_after (pat
, insn
);
2304 PUT_CODE (insn
, NOTE
);
2305 NOTE_LINE_NUMBER (insn
) = NOTE_INSN_DELETED
;
2306 NOTE_SOURCE_FILE (insn
) = 0;
2309 PATTERN (insn
) = pat
;
2314 if ((SET_DEST (x
) == var
2315 || (GET_CODE (SET_DEST (x
)) == SUBREG
2316 && SUBREG_REG (SET_DEST (x
)) == var
))
2317 && (GET_CODE (SET_SRC (x
)) == REG
2318 || (GET_CODE (SET_SRC (x
)) == SUBREG
2319 && GET_CODE (SUBREG_REG (SET_SRC (x
))) == REG
))
2320 && GET_MODE (var
) == promoted_mode
2321 && x
== single_set (insn
))
2325 if (GET_CODE (SET_DEST (x
)) == SUBREG
)
2326 SET_DEST (x
) = fixup_memory_subreg (SET_DEST (x
), insn
, 0);
2328 SET_DEST (x
) = fixup_stack_1 (SET_DEST (x
), insn
);
2330 if (recog_memoized (insn
) >= 0)
2333 pat
= gen_move_insn (SET_DEST (x
), SET_SRC (x
));
2334 if (GET_CODE (pat
) == SEQUENCE
)
2336 emit_insn_after (pat
, insn
);
2337 PUT_CODE (insn
, NOTE
);
2338 NOTE_LINE_NUMBER (insn
) = NOTE_INSN_DELETED
;
2339 NOTE_SOURCE_FILE (insn
) = 0;
2342 PATTERN (insn
) = pat
;
2347 /* Otherwise, storing into VAR must be handled specially
2348 by storing into a temporary and copying that into VAR
2349 with a new insn after this one. Note that this case
2350 will be used when storing into a promoted scalar since
2351 the insn will now have different modes on the input
2352 and output and hence will be invalid (except for the case
2353 of setting it to a constant, which does not need any
2354 change if it is valid). We generate extra code in that case,
2355 but combine.c will eliminate it. */
2360 rtx fixeddest
= SET_DEST (x
);
2362 /* STRICT_LOW_PART can be discarded, around a MEM. */
2363 if (GET_CODE (fixeddest
) == STRICT_LOW_PART
)
2364 fixeddest
= XEXP (fixeddest
, 0);
2365 /* Convert (SUBREG (MEM)) to a MEM in a changed mode. */
2366 if (GET_CODE (fixeddest
) == SUBREG
)
2368 fixeddest
= fixup_memory_subreg (fixeddest
, insn
, 0);
2369 promoted_mode
= GET_MODE (fixeddest
);
2372 fixeddest
= fixup_stack_1 (fixeddest
, insn
);
2374 temp
= gen_reg_rtx (promoted_mode
);
2376 emit_insn_after (gen_move_insn (fixeddest
,
2377 gen_lowpart (GET_MODE (fixeddest
),
2381 SET_DEST (x
) = temp
;
2389 /* Nothing special about this RTX; fix its operands. */
2391 fmt
= GET_RTX_FORMAT (code
);
2392 for (i
= GET_RTX_LENGTH (code
) - 1; i
>= 0; i
--)
2395 fixup_var_refs_1 (var
, promoted_mode
, &XEXP (x
, i
), insn
, replacements
);
2399 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
2400 fixup_var_refs_1 (var
, promoted_mode
, &XVECEXP (x
, i
, j
),
2401 insn
, replacements
);
2406 /* Given X, an rtx of the form (SUBREG:m1 (MEM:m2 addr)),
2407 return an rtx (MEM:m1 newaddr) which is equivalent.
2408 If any insns must be emitted to compute NEWADDR, put them before INSN.
2410 UNCRITICAL nonzero means accept paradoxical subregs.
2411 This is used for subregs found inside REG_NOTES. */
2414 fixup_memory_subreg (x
, insn
, uncritical
)
2419 int offset
= SUBREG_WORD (x
) * UNITS_PER_WORD
;
2420 rtx addr
= XEXP (SUBREG_REG (x
), 0);
2421 enum machine_mode mode
= GET_MODE (x
);
2424 /* Paradoxical SUBREGs are usually invalid during RTL generation. */
2425 if (GET_MODE_SIZE (mode
) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x
)))
2429 if (BYTES_BIG_ENDIAN
)
2430 offset
+= (MIN (UNITS_PER_WORD
, GET_MODE_SIZE (GET_MODE (SUBREG_REG (x
))))
2431 - MIN (UNITS_PER_WORD
, GET_MODE_SIZE (mode
)));
2432 addr
= plus_constant (addr
, offset
);
2433 if (!flag_force_addr
&& memory_address_p (mode
, addr
))
2434 /* Shortcut if no insns need be emitted. */
2435 return change_address (SUBREG_REG (x
), mode
, addr
);
2437 result
= change_address (SUBREG_REG (x
), mode
, addr
);
2438 emit_insn_before (gen_sequence (), insn
);
2443 /* Do fixup_memory_subreg on all (SUBREG (MEM ...) ...) contained in X.
2444 Replace subexpressions of X in place.
2445 If X itself is a (SUBREG (MEM ...) ...), return the replacement expression.
2446 Otherwise return X, with its contents possibly altered.
2448 If any insns must be emitted to compute NEWADDR, put them before INSN.
2450 UNCRITICAL is as in fixup_memory_subreg. */
2453 walk_fixup_memory_subreg (x
, insn
, uncritical
)
2458 register enum rtx_code code
;
2465 code
= GET_CODE (x
);
2467 if (code
== SUBREG
&& GET_CODE (SUBREG_REG (x
)) == MEM
)
2468 return fixup_memory_subreg (x
, insn
, uncritical
);
2470 /* Nothing special about this RTX; fix its operands. */
2472 fmt
= GET_RTX_FORMAT (code
);
2473 for (i
= GET_RTX_LENGTH (code
) - 1; i
>= 0; i
--)
2476 XEXP (x
, i
) = walk_fixup_memory_subreg (XEXP (x
, i
), insn
, uncritical
);
2480 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
2482 = walk_fixup_memory_subreg (XVECEXP (x
, i
, j
), insn
, uncritical
);
2488 /* For each memory ref within X, if it refers to a stack slot
2489 with an out of range displacement, put the address in a temp register
2490 (emitting new insns before INSN to load these registers)
2491 and alter the memory ref to use that register.
2492 Replace each such MEM rtx with a copy, to avoid clobberage. */
2495 fixup_stack_1 (x
, insn
)
2500 register RTX_CODE code
= GET_CODE (x
);
2505 register rtx ad
= XEXP (x
, 0);
2506 /* If we have address of a stack slot but it's not valid
2507 (displacement is too large), compute the sum in a register. */
2508 if (GET_CODE (ad
) == PLUS
2509 && GET_CODE (XEXP (ad
, 0)) == REG
2510 && ((REGNO (XEXP (ad
, 0)) >= FIRST_VIRTUAL_REGISTER
2511 && REGNO (XEXP (ad
, 0)) <= LAST_VIRTUAL_REGISTER
)
2512 || REGNO (XEXP (ad
, 0)) == FRAME_POINTER_REGNUM
2513 #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
2514 || REGNO (XEXP (ad
, 0)) == HARD_FRAME_POINTER_REGNUM
2516 || REGNO (XEXP (ad
, 0)) == STACK_POINTER_REGNUM
2517 || REGNO (XEXP (ad
, 0)) == ARG_POINTER_REGNUM
2518 || XEXP (ad
, 0) == current_function_internal_arg_pointer
)
2519 && GET_CODE (XEXP (ad
, 1)) == CONST_INT
)
2522 if (memory_address_p (GET_MODE (x
), ad
))
2526 temp
= copy_to_reg (ad
);
2527 seq
= gen_sequence ();
2529 emit_insn_before (seq
, insn
);
2530 return change_address (x
, VOIDmode
, temp
);
2535 fmt
= GET_RTX_FORMAT (code
);
2536 for (i
= GET_RTX_LENGTH (code
) - 1; i
>= 0; i
--)
2539 XEXP (x
, i
) = fixup_stack_1 (XEXP (x
, i
), insn
);
2543 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
2544 XVECEXP (x
, i
, j
) = fixup_stack_1 (XVECEXP (x
, i
, j
), insn
);
2550 /* Optimization: a bit-field instruction whose field
2551 happens to be a byte or halfword in memory
2552 can be changed to a move instruction.
2554 We call here when INSN is an insn to examine or store into a bit-field.
2555 BODY is the SET-rtx to be altered.
2557 EQUIV_MEM is the table `reg_equiv_mem' if that is available; else 0.
2558 (Currently this is called only from function.c, and EQUIV_MEM
2562 optimize_bit_field (body
, insn
, equiv_mem
)
2567 register rtx bitfield
;
2570 enum machine_mode mode
;
2572 if (GET_CODE (SET_DEST (body
)) == SIGN_EXTRACT
2573 || GET_CODE (SET_DEST (body
)) == ZERO_EXTRACT
)
2574 bitfield
= SET_DEST (body
), destflag
= 1;
2576 bitfield
= SET_SRC (body
), destflag
= 0;
2578 /* First check that the field being stored has constant size and position
2579 and is in fact a byte or halfword suitably aligned. */
2581 if (GET_CODE (XEXP (bitfield
, 1)) == CONST_INT
2582 && GET_CODE (XEXP (bitfield
, 2)) == CONST_INT
2583 && ((mode
= mode_for_size (INTVAL (XEXP (bitfield
, 1)), MODE_INT
, 1))
2585 && INTVAL (XEXP (bitfield
, 2)) % INTVAL (XEXP (bitfield
, 1)) == 0)
2587 register rtx memref
= 0;
2589 /* Now check that the containing word is memory, not a register,
2590 and that it is safe to change the machine mode. */
2592 if (GET_CODE (XEXP (bitfield
, 0)) == MEM
)
2593 memref
= XEXP (bitfield
, 0);
2594 else if (GET_CODE (XEXP (bitfield
, 0)) == REG
2596 memref
= equiv_mem
[REGNO (XEXP (bitfield
, 0))];
2597 else if (GET_CODE (XEXP (bitfield
, 0)) == SUBREG
2598 && GET_CODE (SUBREG_REG (XEXP (bitfield
, 0))) == MEM
)
2599 memref
= SUBREG_REG (XEXP (bitfield
, 0));
2600 else if (GET_CODE (XEXP (bitfield
, 0)) == SUBREG
2602 && GET_CODE (SUBREG_REG (XEXP (bitfield
, 0))) == REG
)
2603 memref
= equiv_mem
[REGNO (SUBREG_REG (XEXP (bitfield
, 0)))];
2606 && ! mode_dependent_address_p (XEXP (memref
, 0))
2607 && ! MEM_VOLATILE_P (memref
))
2609 /* Now adjust the address, first for any subreg'ing
2610 that we are now getting rid of,
2611 and then for which byte of the word is wanted. */
2613 HOST_WIDE_INT offset
= INTVAL (XEXP (bitfield
, 2));
2616 /* Adjust OFFSET to count bits from low-address byte. */
2617 if (BITS_BIG_ENDIAN
!= BYTES_BIG_ENDIAN
)
2618 offset
= (GET_MODE_BITSIZE (GET_MODE (XEXP (bitfield
, 0)))
2619 - offset
- INTVAL (XEXP (bitfield
, 1)));
2621 /* Adjust OFFSET to count bytes from low-address byte. */
2622 offset
/= BITS_PER_UNIT
;
2623 if (GET_CODE (XEXP (bitfield
, 0)) == SUBREG
)
2625 offset
+= SUBREG_WORD (XEXP (bitfield
, 0)) * UNITS_PER_WORD
;
2626 if (BYTES_BIG_ENDIAN
)
2627 offset
-= (MIN (UNITS_PER_WORD
,
2628 GET_MODE_SIZE (GET_MODE (XEXP (bitfield
, 0))))
2629 - MIN (UNITS_PER_WORD
,
2630 GET_MODE_SIZE (GET_MODE (memref
))));
2634 memref
= change_address (memref
, mode
,
2635 plus_constant (XEXP (memref
, 0), offset
));
2636 insns
= get_insns ();
2638 emit_insns_before (insns
, insn
);
2640 /* Store this memory reference where
2641 we found the bit field reference. */
2645 validate_change (insn
, &SET_DEST (body
), memref
, 1);
2646 if (! CONSTANT_ADDRESS_P (SET_SRC (body
)))
2648 rtx src
= SET_SRC (body
);
2649 while (GET_CODE (src
) == SUBREG
2650 && SUBREG_WORD (src
) == 0)
2651 src
= SUBREG_REG (src
);
2652 if (GET_MODE (src
) != GET_MODE (memref
))
2653 src
= gen_lowpart (GET_MODE (memref
), SET_SRC (body
));
2654 validate_change (insn
, &SET_SRC (body
), src
, 1);
2656 else if (GET_MODE (SET_SRC (body
)) != VOIDmode
2657 && GET_MODE (SET_SRC (body
)) != GET_MODE (memref
))
2658 /* This shouldn't happen because anything that didn't have
2659 one of these modes should have got converted explicitly
2660 and then referenced through a subreg.
2661 This is so because the original bit-field was
2662 handled by agg_mode and so its tree structure had
2663 the same mode that memref now has. */
2668 rtx dest
= SET_DEST (body
);
2670 while (GET_CODE (dest
) == SUBREG
2671 && SUBREG_WORD (dest
) == 0
2672 && (GET_MODE_CLASS (GET_MODE (dest
))
2673 == GET_MODE_CLASS (GET_MODE (SUBREG_REG (dest
)))))
2674 dest
= SUBREG_REG (dest
);
2676 validate_change (insn
, &SET_DEST (body
), dest
, 1);
2678 if (GET_MODE (dest
) == GET_MODE (memref
))
2679 validate_change (insn
, &SET_SRC (body
), memref
, 1);
2682 /* Convert the mem ref to the destination mode. */
2683 rtx newreg
= gen_reg_rtx (GET_MODE (dest
));
2686 convert_move (newreg
, memref
,
2687 GET_CODE (SET_SRC (body
)) == ZERO_EXTRACT
);
2691 validate_change (insn
, &SET_SRC (body
), newreg
, 1);
2695 /* See if we can convert this extraction or insertion into
2696 a simple move insn. We might not be able to do so if this
2697 was, for example, part of a PARALLEL.
2699 If we succeed, write out any needed conversions. If we fail,
2700 it is hard to guess why we failed, so don't do anything
2701 special; just let the optimization be suppressed. */
2703 if (apply_change_group () && seq
)
2704 emit_insns_before (seq
, insn
);
2709 /* These routines are responsible for converting virtual register references
2710 to the actual hard register references once RTL generation is complete.
2712 The following four variables are used for communication between the
2713 routines. They contain the offsets of the virtual registers from their
2714 respective hard registers. */
2716 static int in_arg_offset
;
2717 static int var_offset
;
2718 static int dynamic_offset
;
2719 static int out_arg_offset
;
2720 static int cfa_offset
;
2722 /* In most machines, the stack pointer register is equivalent to the bottom
2725 #ifndef STACK_POINTER_OFFSET
2726 #define STACK_POINTER_OFFSET 0
2729 /* If not defined, pick an appropriate default for the offset of dynamically
2730 allocated memory depending on the value of ACCUMULATE_OUTGOING_ARGS,
2731 REG_PARM_STACK_SPACE, and OUTGOING_REG_PARM_STACK_SPACE. */
2733 #ifndef STACK_DYNAMIC_OFFSET
2735 #ifdef ACCUMULATE_OUTGOING_ARGS
2736 /* The bottom of the stack points to the actual arguments. If
2737 REG_PARM_STACK_SPACE is defined, this includes the space for the register
2738 parameters. However, if OUTGOING_REG_PARM_STACK space is not defined,
2739 stack space for register parameters is not pushed by the caller, but
2740 rather part of the fixed stack areas and hence not included in
2741 `current_function_outgoing_args_size'. Nevertheless, we must allow
2742 for it when allocating stack dynamic objects. */
2744 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
2745 #define STACK_DYNAMIC_OFFSET(FNDECL) \
2746 (current_function_outgoing_args_size \
2747 + REG_PARM_STACK_SPACE (FNDECL) + (STACK_POINTER_OFFSET))
2750 #define STACK_DYNAMIC_OFFSET(FNDECL) \
2751 (current_function_outgoing_args_size + (STACK_POINTER_OFFSET))
2755 #define STACK_DYNAMIC_OFFSET(FNDECL) STACK_POINTER_OFFSET
2759 /* On a few machines, the CFA coincides with the arg pointer. */
2761 #ifndef ARG_POINTER_CFA_OFFSET
2762 #define ARG_POINTER_CFA_OFFSET 0
2766 /* Build up a (MEM (ADDRESSOF (REG))) rtx for a register REG that just had
2767 its address taken. DECL is the decl for the object stored in the
2768 register, for later use if we do need to force REG into the stack.
2769 REG is overwritten by the MEM like in put_reg_into_stack. */
2772 gen_mem_addressof (reg
, decl
)
2776 tree type
= TREE_TYPE (decl
);
2777 rtx r
= gen_rtx_ADDRESSOF (Pmode
, gen_reg_rtx (GET_MODE (reg
)), REGNO (reg
));
2778 SET_ADDRESSOF_DECL (r
, decl
);
2779 /* If the original REG was a user-variable, then so is the REG whose
2780 address is being taken. */
2781 REG_USERVAR_P (XEXP (r
, 0)) = REG_USERVAR_P (reg
);
2784 PUT_CODE (reg
, MEM
);
2785 PUT_MODE (reg
, DECL_MODE (decl
));
2786 MEM_VOLATILE_P (reg
) = TREE_SIDE_EFFECTS (decl
);
2787 MEM_SET_IN_STRUCT_P (reg
, AGGREGATE_TYPE_P (type
));
2788 MEM_ALIAS_SET (reg
) = get_alias_set (decl
);
2790 if (TREE_USED (decl
) || DECL_INITIAL (decl
) != 0)
2791 fixup_var_refs (reg
, GET_MODE (reg
), TREE_UNSIGNED (type
));
2796 /* If DECL has an RTL that is an ADDRESSOF rtx, put it into the stack. */
2799 flush_addressof (decl
)
2802 if ((TREE_CODE (decl
) == PARM_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
2803 && DECL_RTL (decl
) != 0
2804 && GET_CODE (DECL_RTL (decl
)) == MEM
2805 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == ADDRESSOF
2806 && GET_CODE (XEXP (XEXP (DECL_RTL (decl
), 0), 0)) == REG
)
2807 put_addressof_into_stack (XEXP (DECL_RTL (decl
), 0));
2810 /* Force the register pointed to by R, an ADDRESSOF rtx, into the stack. */
2813 put_addressof_into_stack (r
)
2816 tree decl
= ADDRESSOF_DECL (r
);
2817 rtx reg
= XEXP (r
, 0);
2819 if (GET_CODE (reg
) != REG
)
2822 put_reg_into_stack (0, reg
, TREE_TYPE (decl
), GET_MODE (reg
),
2823 DECL_MODE (decl
), TREE_SIDE_EFFECTS (decl
),
2824 ADDRESSOF_REGNO (r
),
2825 TREE_USED (decl
) || DECL_INITIAL (decl
) != 0);
2828 /* List of replacements made below in purge_addressof_1 when creating
2829 bitfield insertions. */
2830 static rtx purge_addressof_replacements
;
2832 /* Helper function for purge_addressof. See if the rtx expression at *LOC
2833 in INSN needs to be changed. If FORCE, always put any ADDRESSOFs into
2837 purge_addressof_1 (loc
, insn
, force
, store
)
2847 /* Re-start here to avoid recursion in common cases. */
2854 code
= GET_CODE (x
);
2856 if (code
== ADDRESSOF
&& GET_CODE (XEXP (x
, 0)) == MEM
)
2859 /* We must create a copy of the rtx because it was created by
2860 overwriting a REG rtx which is always shared. */
2861 rtx sub
= copy_rtx (XEXP (XEXP (x
, 0), 0));
2863 if (validate_change (insn
, loc
, sub
, 0))
2867 if (! validate_change (insn
, loc
,
2868 force_operand (sub
, NULL_RTX
),
2872 insns
= gen_sequence ();
2874 emit_insn_before (insns
, insn
);
2877 else if (code
== MEM
&& GET_CODE (XEXP (x
, 0)) == ADDRESSOF
&& ! force
)
2879 rtx sub
= XEXP (XEXP (x
, 0), 0);
2881 if (GET_CODE (sub
) == MEM
)
2882 sub
= gen_rtx_MEM (GET_MODE (x
), copy_rtx (XEXP (sub
, 0)));
2884 if (GET_CODE (sub
) == REG
2885 && (MEM_VOLATILE_P (x
) || GET_MODE (x
) == BLKmode
))
2887 put_addressof_into_stack (XEXP (x
, 0));
2890 else if (GET_CODE (sub
) == REG
&& GET_MODE (x
) != GET_MODE (sub
))
2892 int size_x
, size_sub
;
2896 /* When processing REG_NOTES look at the list of
2897 replacements done on the insn to find the register that X
2901 for (tem
= purge_addressof_replacements
; tem
!= NULL_RTX
;
2902 tem
= XEXP (XEXP (tem
, 1), 1))
2904 rtx y
= XEXP (tem
, 0);
2905 if (GET_CODE (y
) == MEM
2906 && rtx_equal_p (XEXP (x
, 0), XEXP (y
, 0)))
2908 /* It can happen that the note may speak of things in
2909 a wider (or just different) mode than the code did.
2910 This is especially true of REG_RETVAL. */
2912 rtx z
= XEXP (XEXP (tem
, 1), 0);
2913 if (GET_MODE (x
) != GET_MODE (y
))
2915 if (GET_CODE (z
) == SUBREG
&& SUBREG_WORD (z
) == 0)
2918 /* ??? If we'd gotten into any of the really complex
2919 cases below, I'm not sure we can do a proper
2920 replacement. Might we be able to delete the
2921 note in some cases? */
2922 if (GET_MODE_SIZE (GET_MODE (x
))
2923 < GET_MODE_SIZE (GET_MODE (y
)))
2926 z
= gen_lowpart (GET_MODE (x
), z
);
2934 /* There should always be such a replacement. */
2938 size_x
= GET_MODE_BITSIZE (GET_MODE (x
));
2939 size_sub
= GET_MODE_BITSIZE (GET_MODE (sub
));
2941 /* Don't even consider working with paradoxical subregs,
2942 or the moral equivalent seen here. */
2943 if (size_x
<= size_sub
2944 && int_mode_for_mode (GET_MODE (sub
)) != BLKmode
)
2946 /* Do a bitfield insertion to mirror what would happen
2956 val
= gen_reg_rtx (GET_MODE (x
));
2957 if (! validate_change (insn
, loc
, val
, 0))
2959 /* Discard the current sequence and put the
2960 ADDRESSOF on stack. */
2964 seq
= gen_sequence ();
2966 emit_insn_before (seq
, insn
);
2969 store_bit_field (sub
, size_x
, 0, GET_MODE (x
),
2970 val
, GET_MODE_SIZE (GET_MODE (sub
)),
2971 GET_MODE_SIZE (GET_MODE (sub
)));
2973 /* Make sure to unshare any shared rtl that store_bit_field
2974 might have created. */
2975 for (p
= get_insns(); p
; p
= NEXT_INSN (p
))
2977 reset_used_flags (PATTERN (p
));
2978 reset_used_flags (REG_NOTES (p
));
2979 reset_used_flags (LOG_LINKS (p
));
2981 unshare_all_rtl (get_insns ());
2983 seq
= gen_sequence ();
2985 emit_insn_after (seq
, insn
);
2990 val
= extract_bit_field (sub
, size_x
, 0, 1, NULL_RTX
,
2991 GET_MODE (x
), GET_MODE (x
),
2992 GET_MODE_SIZE (GET_MODE (sub
)),
2993 GET_MODE_SIZE (GET_MODE (sub
)));
2995 if (! validate_change (insn
, loc
, val
, 0))
2997 /* Discard the current sequence and put the
2998 ADDRESSOF on stack. */
3003 seq
= gen_sequence ();
3005 emit_insn_before (seq
, insn
);
3008 /* Remember the replacement so that the same one can be done
3009 on the REG_NOTES. */
3010 purge_addressof_replacements
3011 = gen_rtx_EXPR_LIST (VOIDmode
, x
,
3012 gen_rtx_EXPR_LIST (VOIDmode
, val
,
3013 purge_addressof_replacements
));
3015 /* We replaced with a reg -- all done. */
3019 else if (validate_change (insn
, loc
, sub
, 0))
3021 /* Remember the replacement so that the same one can be done
3022 on the REG_NOTES. */
3023 purge_addressof_replacements
3024 = gen_rtx_EXPR_LIST (VOIDmode
, x
,
3025 gen_rtx_EXPR_LIST (VOIDmode
, sub
,
3026 purge_addressof_replacements
));
3030 /* else give up and put it into the stack */
3032 else if (code
== ADDRESSOF
)
3034 put_addressof_into_stack (x
);
3037 else if (code
== SET
)
3039 purge_addressof_1 (&SET_DEST (x
), insn
, force
, 1);
3040 purge_addressof_1 (&SET_SRC (x
), insn
, force
, 0);
3044 /* Scan all subexpressions. */
3045 fmt
= GET_RTX_FORMAT (code
);
3046 for (i
= 0; i
< GET_RTX_LENGTH (code
); i
++, fmt
++)
3049 purge_addressof_1 (&XEXP (x
, i
), insn
, force
, 0);
3050 else if (*fmt
== 'E')
3051 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
3052 purge_addressof_1 (&XVECEXP (x
, i
, j
), insn
, force
, 0);
3056 /* Eliminate all occurrences of ADDRESSOF from INSNS. Elide any remaining
3057 (MEM (ADDRESSOF)) patterns, and force any needed registers into the
3061 purge_addressof (insns
)
3065 for (insn
= insns
; insn
; insn
= NEXT_INSN (insn
))
3066 if (GET_CODE (insn
) == INSN
|| GET_CODE (insn
) == JUMP_INSN
3067 || GET_CODE (insn
) == CALL_INSN
)
3069 purge_addressof_1 (&PATTERN (insn
), insn
,
3070 asm_noperands (PATTERN (insn
)) > 0, 0);
3071 purge_addressof_1 (®_NOTES (insn
), NULL_RTX
, 0, 0);
3073 purge_addressof_replacements
= 0;
3076 /* Pass through the INSNS of function FNDECL and convert virtual register
3077 references to hard register references. */
3080 instantiate_virtual_regs (fndecl
, insns
)
3087 /* Compute the offsets to use for this function. */
3088 in_arg_offset
= FIRST_PARM_OFFSET (fndecl
);
3089 var_offset
= STARTING_FRAME_OFFSET
;
3090 dynamic_offset
= STACK_DYNAMIC_OFFSET (fndecl
);
3091 out_arg_offset
= STACK_POINTER_OFFSET
;
3092 cfa_offset
= ARG_POINTER_CFA_OFFSET
;
3094 /* Scan all variables and parameters of this function. For each that is
3095 in memory, instantiate all virtual registers if the result is a valid
3096 address. If not, we do it later. That will handle most uses of virtual
3097 regs on many machines. */
3098 instantiate_decls (fndecl
, 1);
3100 /* Initialize recognition, indicating that volatile is OK. */
3103 /* Scan through all the insns, instantiating every virtual register still
3105 for (insn
= insns
; insn
; insn
= NEXT_INSN (insn
))
3106 if (GET_CODE (insn
) == INSN
|| GET_CODE (insn
) == JUMP_INSN
3107 || GET_CODE (insn
) == CALL_INSN
)
3109 instantiate_virtual_regs_1 (&PATTERN (insn
), insn
, 1);
3110 instantiate_virtual_regs_1 (®_NOTES (insn
), NULL_RTX
, 0);
3113 /* Instantiate the stack slots for the parm registers, for later use in
3114 addressof elimination. */
3115 for (i
= 0; i
< max_parm_reg
; ++i
)
3116 if (parm_reg_stack_loc
[i
])
3117 instantiate_virtual_regs_1 (&parm_reg_stack_loc
[i
], NULL_RTX
, 0);
3119 /* Now instantiate the remaining register equivalences for debugging info.
3120 These will not be valid addresses. */
3121 instantiate_decls (fndecl
, 0);
3123 /* Indicate that, from now on, assign_stack_local should use
3124 frame_pointer_rtx. */
3125 virtuals_instantiated
= 1;
3128 /* Scan all decls in FNDECL (both variables and parameters) and instantiate
3129 all virtual registers in their DECL_RTL's.
3131 If VALID_ONLY, do this only if the resulting address is still valid.
3132 Otherwise, always do it. */
3135 instantiate_decls (fndecl
, valid_only
)
3141 if (DECL_SAVED_INSNS (fndecl
))
3142 /* When compiling an inline function, the obstack used for
3143 rtl allocation is the maybepermanent_obstack. Calling
3144 `resume_temporary_allocation' switches us back to that
3145 obstack while we process this function's parameters. */
3146 resume_temporary_allocation ();
3148 /* Process all parameters of the function. */
3149 for (decl
= DECL_ARGUMENTS (fndecl
); decl
; decl
= TREE_CHAIN (decl
))
3151 HOST_WIDE_INT size
= int_size_in_bytes (TREE_TYPE (decl
));
3153 instantiate_decl (DECL_RTL (decl
), size
, valid_only
);
3155 /* If the parameter was promoted, then the incoming RTL mode may be
3156 larger than the declared type size. We must use the larger of
3158 size
= MAX (GET_MODE_SIZE (GET_MODE (DECL_INCOMING_RTL (decl
))), size
);
3159 instantiate_decl (DECL_INCOMING_RTL (decl
), size
, valid_only
);
3162 /* Now process all variables defined in the function or its subblocks. */
3163 instantiate_decls_1 (DECL_INITIAL (fndecl
), valid_only
);
3165 if (DECL_INLINE (fndecl
) || DECL_DEFER_OUTPUT (fndecl
))
3167 /* Save all rtl allocated for this function by raising the
3168 high-water mark on the maybepermanent_obstack. */
3170 /* All further rtl allocation is now done in the current_obstack. */
3171 rtl_in_current_obstack ();
3175 /* Subroutine of instantiate_decls: Process all decls in the given
3176 BLOCK node and all its subblocks. */
3179 instantiate_decls_1 (let
, valid_only
)
3185 for (t
= BLOCK_VARS (let
); t
; t
= TREE_CHAIN (t
))
3186 instantiate_decl (DECL_RTL (t
), int_size_in_bytes (TREE_TYPE (t
)),
3189 /* Process all subblocks. */
3190 for (t
= BLOCK_SUBBLOCKS (let
); t
; t
= TREE_CHAIN (t
))
3191 instantiate_decls_1 (t
, valid_only
);
3194 /* Subroutine of the preceding procedures: Given RTL representing a
3195 decl and the size of the object, do any instantiation required.
3197 If VALID_ONLY is non-zero, it means that the RTL should only be
3198 changed if the new address is valid. */
3201 instantiate_decl (x
, size
, valid_only
)
3206 enum machine_mode mode
;
3209 /* If this is not a MEM, no need to do anything. Similarly if the
3210 address is a constant or a register that is not a virtual register. */
3212 if (x
== 0 || GET_CODE (x
) != MEM
)
3216 if (CONSTANT_P (addr
)
3217 || (GET_CODE (addr
) == ADDRESSOF
&& GET_CODE (XEXP (addr
, 0)) == REG
)
3218 || (GET_CODE (addr
) == REG
3219 && (REGNO (addr
) < FIRST_VIRTUAL_REGISTER
3220 || REGNO (addr
) > LAST_VIRTUAL_REGISTER
)))
3223 /* If we should only do this if the address is valid, copy the address.
3224 We need to do this so we can undo any changes that might make the
3225 address invalid. This copy is unfortunate, but probably can't be
3229 addr
= copy_rtx (addr
);
3231 instantiate_virtual_regs_1 (&addr
, NULL_RTX
, 0);
3235 /* Now verify that the resulting address is valid for every integer or
3236 floating-point mode up to and including SIZE bytes long. We do this
3237 since the object might be accessed in any mode and frame addresses
3240 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
3241 mode
!= VOIDmode
&& GET_MODE_SIZE (mode
) <= size
;
3242 mode
= GET_MODE_WIDER_MODE (mode
))
3243 if (! memory_address_p (mode
, addr
))
3246 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
3247 mode
!= VOIDmode
&& GET_MODE_SIZE (mode
) <= size
;
3248 mode
= GET_MODE_WIDER_MODE (mode
))
3249 if (! memory_address_p (mode
, addr
))
3253 /* Put back the address now that we have updated it and we either know
3254 it is valid or we don't care whether it is valid. */
3259 /* Given a pointer to a piece of rtx and an optional pointer to the
3260 containing object, instantiate any virtual registers present in it.
3262 If EXTRA_INSNS, we always do the replacement and generate
3263 any extra insns before OBJECT. If it zero, we do nothing if replacement
3266 Return 1 if we either had nothing to do or if we were able to do the
3267 needed replacement. Return 0 otherwise; we only return zero if
3268 EXTRA_INSNS is zero.
3270 We first try some simple transformations to avoid the creation of extra
3274 instantiate_virtual_regs_1 (loc
, object
, extra_insns
)
3282 HOST_WIDE_INT offset
;
3288 /* Re-start here to avoid recursion in common cases. */
3295 code
= GET_CODE (x
);
3297 /* Check for some special cases. */
3314 /* We are allowed to set the virtual registers. This means that
3315 the actual register should receive the source minus the
3316 appropriate offset. This is used, for example, in the handling
3317 of non-local gotos. */
3318 if (SET_DEST (x
) == virtual_incoming_args_rtx
)
3319 new = arg_pointer_rtx
, offset
= - in_arg_offset
;
3320 else if (SET_DEST (x
) == virtual_stack_vars_rtx
)
3321 new = frame_pointer_rtx
, offset
= - var_offset
;
3322 else if (SET_DEST (x
) == virtual_stack_dynamic_rtx
)
3323 new = stack_pointer_rtx
, offset
= - dynamic_offset
;
3324 else if (SET_DEST (x
) == virtual_outgoing_args_rtx
)
3325 new = stack_pointer_rtx
, offset
= - out_arg_offset
;
3326 else if (SET_DEST (x
) == virtual_cfa_rtx
)
3327 new = arg_pointer_rtx
, offset
= - cfa_offset
;
3331 /* The only valid sources here are PLUS or REG. Just do
3332 the simplest possible thing to handle them. */
3333 if (GET_CODE (SET_SRC (x
)) != REG
3334 && GET_CODE (SET_SRC (x
)) != PLUS
)
3338 if (GET_CODE (SET_SRC (x
)) != REG
)
3339 temp
= force_operand (SET_SRC (x
), NULL_RTX
);
3342 temp
= force_operand (plus_constant (temp
, offset
), NULL_RTX
);
3346 emit_insns_before (seq
, object
);
3349 if (! validate_change (object
, &SET_SRC (x
), temp
, 0)
3356 instantiate_virtual_regs_1 (&SET_DEST (x
), object
, extra_insns
);
3361 /* Handle special case of virtual register plus constant. */
3362 if (CONSTANT_P (XEXP (x
, 1)))
3364 rtx old
, new_offset
;
3366 /* Check for (plus (plus VIRT foo) (const_int)) first. */
3367 if (GET_CODE (XEXP (x
, 0)) == PLUS
)
3369 rtx inner
= XEXP (XEXP (x
, 0), 0);
3371 if (inner
== virtual_incoming_args_rtx
)
3372 new = arg_pointer_rtx
, offset
= in_arg_offset
;
3373 else if (inner
== virtual_stack_vars_rtx
)
3374 new = frame_pointer_rtx
, offset
= var_offset
;
3375 else if (inner
== virtual_stack_dynamic_rtx
)
3376 new = stack_pointer_rtx
, offset
= dynamic_offset
;
3377 else if (inner
== virtual_outgoing_args_rtx
)
3378 new = stack_pointer_rtx
, offset
= out_arg_offset
;
3379 else if (inner
== virtual_cfa_rtx
)
3380 new = arg_pointer_rtx
, offset
= cfa_offset
;
3387 instantiate_virtual_regs_1 (&XEXP (XEXP (x
, 0), 1), object
,
3389 new = gen_rtx_PLUS (Pmode
, new, XEXP (XEXP (x
, 0), 1));
3392 else if (XEXP (x
, 0) == virtual_incoming_args_rtx
)
3393 new = arg_pointer_rtx
, offset
= in_arg_offset
;
3394 else if (XEXP (x
, 0) == virtual_stack_vars_rtx
)
3395 new = frame_pointer_rtx
, offset
= var_offset
;
3396 else if (XEXP (x
, 0) == virtual_stack_dynamic_rtx
)
3397 new = stack_pointer_rtx
, offset
= dynamic_offset
;
3398 else if (XEXP (x
, 0) == virtual_outgoing_args_rtx
)
3399 new = stack_pointer_rtx
, offset
= out_arg_offset
;
3400 else if (XEXP (x
, 0) == virtual_cfa_rtx
)
3401 new = arg_pointer_rtx
, offset
= cfa_offset
;
3404 /* We know the second operand is a constant. Unless the
3405 first operand is a REG (which has been already checked),
3406 it needs to be checked. */
3407 if (GET_CODE (XEXP (x
, 0)) != REG
)
3415 new_offset
= plus_constant (XEXP (x
, 1), offset
);
3417 /* If the new constant is zero, try to replace the sum with just
3419 if (new_offset
== const0_rtx
3420 && validate_change (object
, loc
, new, 0))
3423 /* Next try to replace the register and new offset.
3424 There are two changes to validate here and we can't assume that
3425 in the case of old offset equals new just changing the register
3426 will yield a valid insn. In the interests of a little efficiency,
3427 however, we only call validate change once (we don't queue up the
3428 changes and then call apply_change_group). */
3432 ? ! validate_change (object
, &XEXP (x
, 0), new, 0)
3433 : (XEXP (x
, 0) = new,
3434 ! validate_change (object
, &XEXP (x
, 1), new_offset
, 0)))
3442 /* Otherwise copy the new constant into a register and replace
3443 constant with that register. */
3444 temp
= gen_reg_rtx (Pmode
);
3446 if (validate_change (object
, &XEXP (x
, 1), temp
, 0))
3447 emit_insn_before (gen_move_insn (temp
, new_offset
), object
);
3450 /* If that didn't work, replace this expression with a
3451 register containing the sum. */
3454 new = gen_rtx_PLUS (Pmode
, new, new_offset
);
3457 temp
= force_operand (new, NULL_RTX
);
3461 emit_insns_before (seq
, object
);
3462 if (! validate_change (object
, loc
, temp
, 0)
3463 && ! validate_replace_rtx (x
, temp
, object
))
3471 /* Fall through to generic two-operand expression case. */
3477 case DIV
: case UDIV
:
3478 case MOD
: case UMOD
:
3479 case AND
: case IOR
: case XOR
:
3480 case ROTATERT
: case ROTATE
:
3481 case ASHIFTRT
: case LSHIFTRT
: case ASHIFT
:
3483 case GE
: case GT
: case GEU
: case GTU
:
3484 case LE
: case LT
: case LEU
: case LTU
:
3485 if (XEXP (x
, 1) && ! CONSTANT_P (XEXP (x
, 1)))
3486 instantiate_virtual_regs_1 (&XEXP (x
, 1), object
, extra_insns
);
3491 /* Most cases of MEM that convert to valid addresses have already been
3492 handled by our scan of decls. The only special handling we
3493 need here is to make a copy of the rtx to ensure it isn't being
3494 shared if we have to change it to a pseudo.
3496 If the rtx is a simple reference to an address via a virtual register,
3497 it can potentially be shared. In such cases, first try to make it
3498 a valid address, which can also be shared. Otherwise, copy it and
3501 First check for common cases that need no processing. These are
3502 usually due to instantiation already being done on a previous instance
3506 if (CONSTANT_ADDRESS_P (temp
)
3507 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
3508 || temp
== arg_pointer_rtx
3510 #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
3511 || temp
== hard_frame_pointer_rtx
3513 || temp
== frame_pointer_rtx
)
3516 if (GET_CODE (temp
) == PLUS
3517 && CONSTANT_ADDRESS_P (XEXP (temp
, 1))
3518 && (XEXP (temp
, 0) == frame_pointer_rtx
3519 #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
3520 || XEXP (temp
, 0) == hard_frame_pointer_rtx
3522 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
3523 || XEXP (temp
, 0) == arg_pointer_rtx
3528 if (temp
== virtual_stack_vars_rtx
3529 || temp
== virtual_incoming_args_rtx
3530 || (GET_CODE (temp
) == PLUS
3531 && CONSTANT_ADDRESS_P (XEXP (temp
, 1))
3532 && (XEXP (temp
, 0) == virtual_stack_vars_rtx
3533 || XEXP (temp
, 0) == virtual_incoming_args_rtx
)))
3535 /* This MEM may be shared. If the substitution can be done without
3536 the need to generate new pseudos, we want to do it in place
3537 so all copies of the shared rtx benefit. The call below will
3538 only make substitutions if the resulting address is still
3541 Note that we cannot pass X as the object in the recursive call
3542 since the insn being processed may not allow all valid
3543 addresses. However, if we were not passed on object, we can
3544 only modify X without copying it if X will have a valid
3547 ??? Also note that this can still lose if OBJECT is an insn that
3548 has less restrictions on an address that some other insn.
3549 In that case, we will modify the shared address. This case
3550 doesn't seem very likely, though. One case where this could
3551 happen is in the case of a USE or CLOBBER reference, but we
3552 take care of that below. */
3554 if (instantiate_virtual_regs_1 (&XEXP (x
, 0),
3555 object
? object
: x
, 0))
3558 /* Otherwise make a copy and process that copy. We copy the entire
3559 RTL expression since it might be a PLUS which could also be
3561 *loc
= x
= copy_rtx (x
);
3564 /* Fall through to generic unary operation case. */
3566 case STRICT_LOW_PART
:
3568 case PRE_DEC
: case PRE_INC
: case POST_DEC
: case POST_INC
:
3569 case SIGN_EXTEND
: case ZERO_EXTEND
:
3570 case TRUNCATE
: case FLOAT_EXTEND
: case FLOAT_TRUNCATE
:
3571 case FLOAT
: case FIX
:
3572 case UNSIGNED_FIX
: case UNSIGNED_FLOAT
:
3576 /* These case either have just one operand or we know that we need not
3577 check the rest of the operands. */
3583 /* If the operand is a MEM, see if the change is a valid MEM. If not,
3584 go ahead and make the invalid one, but do it to a copy. For a REG,
3585 just make the recursive call, since there's no chance of a problem. */
3587 if ((GET_CODE (XEXP (x
, 0)) == MEM
3588 && instantiate_virtual_regs_1 (&XEXP (XEXP (x
, 0), 0), XEXP (x
, 0),
3590 || (GET_CODE (XEXP (x
, 0)) == REG
3591 && instantiate_virtual_regs_1 (&XEXP (x
, 0), object
, 0)))
3594 XEXP (x
, 0) = copy_rtx (XEXP (x
, 0));
3599 /* Try to replace with a PLUS. If that doesn't work, compute the sum
3600 in front of this insn and substitute the temporary. */
3601 if (x
== virtual_incoming_args_rtx
)
3602 new = arg_pointer_rtx
, offset
= in_arg_offset
;
3603 else if (x
== virtual_stack_vars_rtx
)
3604 new = frame_pointer_rtx
, offset
= var_offset
;
3605 else if (x
== virtual_stack_dynamic_rtx
)
3606 new = stack_pointer_rtx
, offset
= dynamic_offset
;
3607 else if (x
== virtual_outgoing_args_rtx
)
3608 new = stack_pointer_rtx
, offset
= out_arg_offset
;
3609 else if (x
== virtual_cfa_rtx
)
3610 new = arg_pointer_rtx
, offset
= cfa_offset
;
3614 temp
= plus_constant (new, offset
);
3615 if (!validate_change (object
, loc
, temp
, 0))
3621 temp
= force_operand (temp
, NULL_RTX
);
3625 emit_insns_before (seq
, object
);
3626 if (! validate_change (object
, loc
, temp
, 0)
3627 && ! validate_replace_rtx (x
, temp
, object
))
3635 if (GET_CODE (XEXP (x
, 0)) == REG
)
3638 else if (GET_CODE (XEXP (x
, 0)) == MEM
)
3640 /* If we have a (addressof (mem ..)), do any instantiation inside
3641 since we know we'll be making the inside valid when we finally
3642 remove the ADDRESSOF. */
3643 instantiate_virtual_regs_1 (&XEXP (XEXP (x
, 0), 0), NULL_RTX
, 0);
3652 /* Scan all subexpressions. */
3653 fmt
= GET_RTX_FORMAT (code
);
3654 for (i
= 0; i
< GET_RTX_LENGTH (code
); i
++, fmt
++)
3657 if (!instantiate_virtual_regs_1 (&XEXP (x
, i
), object
, extra_insns
))
3660 else if (*fmt
== 'E')
3661 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
3662 if (! instantiate_virtual_regs_1 (&XVECEXP (x
, i
, j
), object
,
3669 /* Optimization: assuming this function does not receive nonlocal gotos,
3670 delete the handlers for such, as well as the insns to establish
3671 and disestablish them. */
3677 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3679 /* Delete the handler by turning off the flag that would
3680 prevent jump_optimize from deleting it.
3681 Also permit deletion of the nonlocal labels themselves
3682 if nothing local refers to them. */
3683 if (GET_CODE (insn
) == CODE_LABEL
)
3687 LABEL_PRESERVE_P (insn
) = 0;
3689 /* Remove it from the nonlocal_label list, to avoid confusing
3691 for (t
= nonlocal_labels
, last_t
= 0; t
;
3692 last_t
= t
, t
= TREE_CHAIN (t
))
3693 if (DECL_RTL (TREE_VALUE (t
)) == insn
)
3698 nonlocal_labels
= TREE_CHAIN (nonlocal_labels
);
3700 TREE_CHAIN (last_t
) = TREE_CHAIN (t
);
3703 if (GET_CODE (insn
) == INSN
)
3707 for (t
= nonlocal_goto_handler_slots
; t
!= 0; t
= XEXP (t
, 1))
3708 if (reg_mentioned_p (t
, PATTERN (insn
)))
3714 || (nonlocal_goto_stack_level
!= 0
3715 && reg_mentioned_p (nonlocal_goto_stack_level
,
3722 /* Return a list (chain of EXPR_LIST nodes) for the nonlocal labels
3723 of the current function. */
3726 nonlocal_label_rtx_list ()
3731 for (t
= nonlocal_labels
; t
; t
= TREE_CHAIN (t
))
3732 x
= gen_rtx_EXPR_LIST (VOIDmode
, label_rtx (TREE_VALUE (t
)), x
);
3737 /* Output a USE for any register use in RTL.
3738 This is used with -noreg to mark the extent of lifespan
3739 of any registers used in a user-visible variable's DECL_RTL. */
3745 if (GET_CODE (rtl
) == REG
)
3746 /* This is a register variable. */
3747 emit_insn (gen_rtx_USE (VOIDmode
, rtl
));
3748 else if (GET_CODE (rtl
) == MEM
3749 && GET_CODE (XEXP (rtl
, 0)) == REG
3750 && (REGNO (XEXP (rtl
, 0)) < FIRST_VIRTUAL_REGISTER
3751 || REGNO (XEXP (rtl
, 0)) > LAST_VIRTUAL_REGISTER
)
3752 && XEXP (rtl
, 0) != current_function_internal_arg_pointer
)
3753 /* This is a variable-sized structure. */
3754 emit_insn (gen_rtx_USE (VOIDmode
, XEXP (rtl
, 0)));
3757 /* Like use_variable except that it outputs the USEs after INSN
3758 instead of at the end of the insn-chain. */
3761 use_variable_after (rtl
, insn
)
3764 if (GET_CODE (rtl
) == REG
)
3765 /* This is a register variable. */
3766 emit_insn_after (gen_rtx_USE (VOIDmode
, rtl
), insn
);
3767 else if (GET_CODE (rtl
) == MEM
3768 && GET_CODE (XEXP (rtl
, 0)) == REG
3769 && (REGNO (XEXP (rtl
, 0)) < FIRST_VIRTUAL_REGISTER
3770 || REGNO (XEXP (rtl
, 0)) > LAST_VIRTUAL_REGISTER
)
3771 && XEXP (rtl
, 0) != current_function_internal_arg_pointer
)
3772 /* This is a variable-sized structure. */
3773 emit_insn_after (gen_rtx_USE (VOIDmode
, XEXP (rtl
, 0)), insn
);
3779 return max_parm_reg
;
3782 /* Return the first insn following those generated by `assign_parms'. */
3785 get_first_nonparm_insn ()
3788 return NEXT_INSN (last_parm_insn
);
3789 return get_insns ();
3792 /* Return the first NOTE_INSN_BLOCK_BEG note in the function.
3793 Crash if there is none. */
3796 get_first_block_beg ()
3798 register rtx searcher
;
3799 register rtx insn
= get_first_nonparm_insn ();
3801 for (searcher
= insn
; searcher
; searcher
= NEXT_INSN (searcher
))
3802 if (GET_CODE (searcher
) == NOTE
3803 && NOTE_LINE_NUMBER (searcher
) == NOTE_INSN_BLOCK_BEG
)
3806 abort (); /* Invalid call to this function. (See comments above.) */
3810 /* Return 1 if EXP is an aggregate type (or a value with aggregate type).
3811 This means a type for which function calls must pass an address to the
3812 function or get an address back from the function.
3813 EXP may be a type node or an expression (whose type is tested). */
3816 aggregate_value_p (exp
)
3819 int i
, regno
, nregs
;
3822 if (TREE_CODE_CLASS (TREE_CODE (exp
)) == 't')
3825 type
= TREE_TYPE (exp
);
3827 if (RETURN_IN_MEMORY (type
))
3829 /* Types that are TREE_ADDRESSABLE must be constructed in memory,
3830 and thus can't be returned in registers. */
3831 if (TREE_ADDRESSABLE (type
))
3833 if (flag_pcc_struct_return
&& AGGREGATE_TYPE_P (type
))
3835 /* Make sure we have suitable call-clobbered regs to return
3836 the value in; if not, we must return it in memory. */
3837 reg
= hard_function_value (type
, 0);
3839 /* If we have something other than a REG (e.g. a PARALLEL), then assume
3841 if (GET_CODE (reg
) != REG
)
3844 regno
= REGNO (reg
);
3845 nregs
= HARD_REGNO_NREGS (regno
, TYPE_MODE (type
));
3846 for (i
= 0; i
< nregs
; i
++)
3847 if (! call_used_regs
[regno
+ i
])
3852 /* Assign RTL expressions to the function's parameters.
3853 This may involve copying them into registers and using
3854 those registers as the RTL for them.
3856 If SECOND_TIME is non-zero it means that this function is being
3857 called a second time. This is done by integrate.c when a function's
3858 compilation is deferred. We need to come back here in case the
3859 FUNCTION_ARG macro computes items needed for the rest of the compilation
3860 (such as changing which registers are fixed or caller-saved). But suppress
3861 writing any insns or setting DECL_RTL of anything in this case. */
3864 assign_parms (fndecl
, second_time
)
3869 register rtx entry_parm
= 0;
3870 register rtx stack_parm
= 0;
3871 CUMULATIVE_ARGS args_so_far
;
3872 enum machine_mode promoted_mode
, passed_mode
;
3873 enum machine_mode nominal_mode
, promoted_nominal_mode
;
3875 /* Total space needed so far for args on the stack,
3876 given as a constant and a tree-expression. */
3877 struct args_size stack_args_size
;
3878 tree fntype
= TREE_TYPE (fndecl
);
3879 tree fnargs
= DECL_ARGUMENTS (fndecl
);
3880 /* This is used for the arg pointer when referring to stack args. */
3881 rtx internal_arg_pointer
;
3882 /* This is a dummy PARM_DECL that we used for the function result if
3883 the function returns a structure. */
3884 tree function_result_decl
= 0;
3885 int varargs_setup
= 0;
3886 rtx conversion_insns
= 0;
3888 /* Nonzero if the last arg is named `__builtin_va_alist',
3889 which is used on some machines for old-fashioned non-ANSI varargs.h;
3890 this should be stuck onto the stack as if it had arrived there. */
3892 = (current_function_varargs
3894 && (parm
= tree_last (fnargs
)) != 0
3896 && (! strcmp (IDENTIFIER_POINTER (DECL_NAME (parm
)),
3897 "__builtin_va_alist")));
3899 /* Nonzero if function takes extra anonymous args.
3900 This means the last named arg must be on the stack
3901 right before the anonymous ones. */
3903 = (TYPE_ARG_TYPES (fntype
) != 0
3904 && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype
)))
3905 != void_type_node
));
3907 current_function_stdarg
= stdarg
;
3909 /* If the reg that the virtual arg pointer will be translated into is
3910 not a fixed reg or is the stack pointer, make a copy of the virtual
3911 arg pointer, and address parms via the copy. The frame pointer is
3912 considered fixed even though it is not marked as such.
3914 The second time through, simply use ap to avoid generating rtx. */
3916 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
3917 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
3918 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
))
3920 internal_arg_pointer
= copy_to_reg (virtual_incoming_args_rtx
);
3922 internal_arg_pointer
= virtual_incoming_args_rtx
;
3923 current_function_internal_arg_pointer
= internal_arg_pointer
;
3925 stack_args_size
.constant
= 0;
3926 stack_args_size
.var
= 0;
3928 /* If struct value address is treated as the first argument, make it so. */
3929 if (aggregate_value_p (DECL_RESULT (fndecl
))
3930 && ! current_function_returns_pcc_struct
3931 && struct_value_incoming_rtx
== 0)
3933 tree type
= build_pointer_type (TREE_TYPE (fntype
));
3935 function_result_decl
= build_decl (PARM_DECL
, NULL_TREE
, type
);
3937 DECL_ARG_TYPE (function_result_decl
) = type
;
3938 TREE_CHAIN (function_result_decl
) = fnargs
;
3939 fnargs
= function_result_decl
;
3942 max_parm_reg
= LAST_VIRTUAL_REGISTER
+ 1;
3943 parm_reg_stack_loc
= (rtx
*) savealloc (max_parm_reg
* sizeof (rtx
));
3944 bzero ((char *) parm_reg_stack_loc
, max_parm_reg
* sizeof (rtx
));
3946 #ifdef INIT_CUMULATIVE_INCOMING_ARGS
3947 INIT_CUMULATIVE_INCOMING_ARGS (args_so_far
, fntype
, NULL_RTX
);
3949 INIT_CUMULATIVE_ARGS (args_so_far
, fntype
, NULL_RTX
, 0);
3952 /* We haven't yet found an argument that we must push and pretend the
3954 current_function_pretend_args_size
= 0;
3956 for (parm
= fnargs
; parm
; parm
= TREE_CHAIN (parm
))
3958 int aggregate
= AGGREGATE_TYPE_P (TREE_TYPE (parm
));
3959 struct args_size stack_offset
;
3960 struct args_size arg_size
;
3961 int passed_pointer
= 0;
3962 int did_conversion
= 0;
3963 tree passed_type
= DECL_ARG_TYPE (parm
);
3964 tree nominal_type
= TREE_TYPE (parm
);
3966 /* Set LAST_NAMED if this is last named arg before some
3968 int last_named
= ((TREE_CHAIN (parm
) == 0
3969 || DECL_NAME (TREE_CHAIN (parm
)) == 0)
3970 && (stdarg
|| current_function_varargs
));
3971 /* Set NAMED_ARG if this arg should be treated as a named arg. For
3972 most machines, if this is a varargs/stdarg function, then we treat
3973 the last named arg as if it were anonymous too. */
3974 int named_arg
= STRICT_ARGUMENT_NAMING
? 1 : ! last_named
;
3976 if (TREE_TYPE (parm
) == error_mark_node
3977 /* This can happen after weird syntax errors
3978 or if an enum type is defined among the parms. */
3979 || TREE_CODE (parm
) != PARM_DECL
3980 || passed_type
== NULL
)
3982 DECL_INCOMING_RTL (parm
) = DECL_RTL (parm
)
3983 = gen_rtx_MEM (BLKmode
, const0_rtx
);
3984 TREE_USED (parm
) = 1;
3988 /* For varargs.h function, save info about regs and stack space
3989 used by the individual args, not including the va_alist arg. */
3990 if (hide_last_arg
&& last_named
)
3991 current_function_args_info
= args_so_far
;
3993 /* Find mode of arg as it is passed, and mode of arg
3994 as it should be during execution of this function. */
3995 passed_mode
= TYPE_MODE (passed_type
);
3996 nominal_mode
= TYPE_MODE (nominal_type
);
3998 /* If the parm's mode is VOID, its value doesn't matter,
3999 and avoid the usual things like emit_move_insn that could crash. */
4000 if (nominal_mode
== VOIDmode
)
4002 DECL_INCOMING_RTL (parm
) = DECL_RTL (parm
) = const0_rtx
;
4006 /* If the parm is to be passed as a transparent union, use the
4007 type of the first field for the tests below. We have already
4008 verified that the modes are the same. */
4009 if (DECL_TRANSPARENT_UNION (parm
)
4010 || TYPE_TRANSPARENT_UNION (passed_type
))
4011 passed_type
= TREE_TYPE (TYPE_FIELDS (passed_type
));
4013 /* See if this arg was passed by invisible reference. It is if
4014 it is an object whose size depends on the contents of the
4015 object itself or if the machine requires these objects be passed
4018 if ((TREE_CODE (TYPE_SIZE (passed_type
)) != INTEGER_CST
4019 && contains_placeholder_p (TYPE_SIZE (passed_type
)))
4020 || TREE_ADDRESSABLE (passed_type
)
4021 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
4022 || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far
, passed_mode
,
4023 passed_type
, named_arg
)
4027 passed_type
= nominal_type
= build_pointer_type (passed_type
);
4029 passed_mode
= nominal_mode
= Pmode
;
4032 promoted_mode
= passed_mode
;
4034 #ifdef PROMOTE_FUNCTION_ARGS
4035 /* Compute the mode in which the arg is actually extended to. */
4036 unsignedp
= TREE_UNSIGNED (passed_type
);
4037 promoted_mode
= promote_mode (passed_type
, promoted_mode
, &unsignedp
, 1);
4040 /* Let machine desc say which reg (if any) the parm arrives in.
4041 0 means it arrives on the stack. */
4042 #ifdef FUNCTION_INCOMING_ARG
4043 entry_parm
= FUNCTION_INCOMING_ARG (args_so_far
, promoted_mode
,
4044 passed_type
, named_arg
);
4046 entry_parm
= FUNCTION_ARG (args_so_far
, promoted_mode
,
4047 passed_type
, named_arg
);
4050 if (entry_parm
== 0)
4051 promoted_mode
= passed_mode
;
4053 #ifdef SETUP_INCOMING_VARARGS
4054 /* If this is the last named parameter, do any required setup for
4055 varargs or stdargs. We need to know about the case of this being an
4056 addressable type, in which case we skip the registers it
4057 would have arrived in.
4059 For stdargs, LAST_NAMED will be set for two parameters, the one that
4060 is actually the last named, and the dummy parameter. We only
4061 want to do this action once.
4063 Also, indicate when RTL generation is to be suppressed. */
4064 if (last_named
&& !varargs_setup
)
4066 SETUP_INCOMING_VARARGS (args_so_far
, promoted_mode
, passed_type
,
4067 current_function_pretend_args_size
,
4073 /* Determine parm's home in the stack,
4074 in case it arrives in the stack or we should pretend it did.
4076 Compute the stack position and rtx where the argument arrives
4079 There is one complexity here: If this was a parameter that would
4080 have been passed in registers, but wasn't only because it is
4081 __builtin_va_alist, we want locate_and_pad_parm to treat it as if
4082 it came in a register so that REG_PARM_STACK_SPACE isn't skipped.
4083 In this case, we call FUNCTION_ARG with NAMED set to 1 instead of
4084 0 as it was the previous time. */
4086 locate_and_pad_parm (promoted_mode
, passed_type
,
4087 #ifdef STACK_PARMS_IN_REG_PARM_AREA
4090 #ifdef FUNCTION_INCOMING_ARG
4091 FUNCTION_INCOMING_ARG (args_so_far
, promoted_mode
,
4094 || varargs_setup
)) != 0,
4096 FUNCTION_ARG (args_so_far
, promoted_mode
,
4098 named_arg
|| varargs_setup
) != 0,
4101 fndecl
, &stack_args_size
, &stack_offset
, &arg_size
);
4105 rtx offset_rtx
= ARGS_SIZE_RTX (stack_offset
);
4107 if (offset_rtx
== const0_rtx
)
4108 stack_parm
= gen_rtx_MEM (promoted_mode
, internal_arg_pointer
);
4110 stack_parm
= gen_rtx_MEM (promoted_mode
,
4111 gen_rtx_PLUS (Pmode
,
4112 internal_arg_pointer
,
4115 /* If this is a memory ref that contains aggregate components,
4116 mark it as such for cse and loop optimize. Likewise if it
4118 MEM_SET_IN_STRUCT_P (stack_parm
, aggregate
);
4119 RTX_UNCHANGING_P (stack_parm
) = TREE_READONLY (parm
);
4120 MEM_ALIAS_SET (stack_parm
) = get_alias_set (parm
);
4123 /* If this parameter was passed both in registers and in the stack,
4124 use the copy on the stack. */
4125 if (MUST_PASS_IN_STACK (promoted_mode
, passed_type
))
4128 #ifdef FUNCTION_ARG_PARTIAL_NREGS
4129 /* If this parm was passed part in regs and part in memory,
4130 pretend it arrived entirely in memory
4131 by pushing the register-part onto the stack.
4133 In the special case of a DImode or DFmode that is split,
4134 we could put it together in a pseudoreg directly,
4135 but for now that's not worth bothering with. */
4139 int nregs
= FUNCTION_ARG_PARTIAL_NREGS (args_so_far
, promoted_mode
,
4140 passed_type
, named_arg
);
4144 current_function_pretend_args_size
4145 = (((nregs
* UNITS_PER_WORD
) + (PARM_BOUNDARY
/ BITS_PER_UNIT
) - 1)
4146 / (PARM_BOUNDARY
/ BITS_PER_UNIT
)
4147 * (PARM_BOUNDARY
/ BITS_PER_UNIT
));
4151 /* Handle calls that pass values in multiple non-contiguous
4152 locations. The Irix 6 ABI has examples of this. */
4153 if (GET_CODE (entry_parm
) == PARALLEL
)
4154 emit_group_store (validize_mem (stack_parm
), entry_parm
,
4155 int_size_in_bytes (TREE_TYPE (parm
)),
4156 (TYPE_ALIGN (TREE_TYPE (parm
))
4159 move_block_from_reg (REGNO (entry_parm
),
4160 validize_mem (stack_parm
), nregs
,
4161 int_size_in_bytes (TREE_TYPE (parm
)));
4163 entry_parm
= stack_parm
;
4168 /* If we didn't decide this parm came in a register,
4169 by default it came on the stack. */
4170 if (entry_parm
== 0)
4171 entry_parm
= stack_parm
;
4173 /* Record permanently how this parm was passed. */
4175 DECL_INCOMING_RTL (parm
) = entry_parm
;
4177 /* If there is actually space on the stack for this parm,
4178 count it in stack_args_size; otherwise set stack_parm to 0
4179 to indicate there is no preallocated stack slot for the parm. */
4181 if (entry_parm
== stack_parm
4182 #if defined (REG_PARM_STACK_SPACE) && ! defined (MAYBE_REG_PARM_STACK_SPACE)
4183 /* On some machines, even if a parm value arrives in a register
4184 there is still an (uninitialized) stack slot allocated for it.
4186 ??? When MAYBE_REG_PARM_STACK_SPACE is defined, we can't tell
4187 whether this parameter already has a stack slot allocated,
4188 because an arg block exists only if current_function_args_size
4189 is larger than some threshold, and we haven't calculated that
4190 yet. So, for now, we just assume that stack slots never exist
4192 || REG_PARM_STACK_SPACE (fndecl
) > 0
4196 stack_args_size
.constant
+= arg_size
.constant
;
4198 ADD_PARM_SIZE (stack_args_size
, arg_size
.var
);
4201 /* No stack slot was pushed for this parm. */
4204 /* Update info on where next arg arrives in registers. */
4206 FUNCTION_ARG_ADVANCE (args_so_far
, promoted_mode
,
4207 passed_type
, named_arg
);
4209 /* If this is our second time through, we are done with this parm. */
4213 /* If we can't trust the parm stack slot to be aligned enough
4214 for its ultimate type, don't use that slot after entry.
4215 We'll make another stack slot, if we need one. */
4217 int thisparm_boundary
4218 = FUNCTION_ARG_BOUNDARY (promoted_mode
, passed_type
);
4220 if (GET_MODE_ALIGNMENT (nominal_mode
) > thisparm_boundary
)
4224 /* If parm was passed in memory, and we need to convert it on entry,
4225 don't store it back in that same slot. */
4227 && nominal_mode
!= BLKmode
&& nominal_mode
!= passed_mode
)
4231 /* Now adjust STACK_PARM to the mode and precise location
4232 where this parameter should live during execution,
4233 if we discover that it must live in the stack during execution.
4234 To make debuggers happier on big-endian machines, we store
4235 the value in the last bytes of the space available. */
4237 if (nominal_mode
!= BLKmode
&& nominal_mode
!= passed_mode
4242 if (BYTES_BIG_ENDIAN
4243 && GET_MODE_SIZE (nominal_mode
) < UNITS_PER_WORD
)
4244 stack_offset
.constant
+= (GET_MODE_SIZE (passed_mode
)
4245 - GET_MODE_SIZE (nominal_mode
));
4247 offset_rtx
= ARGS_SIZE_RTX (stack_offset
);
4248 if (offset_rtx
== const0_rtx
)
4249 stack_parm
= gen_rtx_MEM (nominal_mode
, internal_arg_pointer
);
4251 stack_parm
= gen_rtx_MEM (nominal_mode
,
4252 gen_rtx_PLUS (Pmode
,
4253 internal_arg_pointer
,
4256 /* If this is a memory ref that contains aggregate components,
4257 mark it as such for cse and loop optimize. */
4258 MEM_SET_IN_STRUCT_P (stack_parm
, aggregate
);
4263 /* We need this "use" info, because the gcc-register->stack-register
4264 converter in reg-stack.c needs to know which registers are active
4265 at the start of the function call. The actual parameter loading
4266 instructions are not always available then anymore, since they might
4267 have been optimised away. */
4269 if (GET_CODE (entry_parm
) == REG
&& !(hide_last_arg
&& last_named
))
4270 emit_insn (gen_rtx_USE (GET_MODE (entry_parm
), entry_parm
));
4273 /* ENTRY_PARM is an RTX for the parameter as it arrives,
4274 in the mode in which it arrives.
4275 STACK_PARM is an RTX for a stack slot where the parameter can live
4276 during the function (in case we want to put it there).
4277 STACK_PARM is 0 if no stack slot was pushed for it.
4279 Now output code if necessary to convert ENTRY_PARM to
4280 the type in which this function declares it,
4281 and store that result in an appropriate place,
4282 which may be a pseudo reg, may be STACK_PARM,
4283 or may be a local stack slot if STACK_PARM is 0.
4285 Set DECL_RTL to that place. */
4287 if (nominal_mode
== BLKmode
|| GET_CODE (entry_parm
) == PARALLEL
)
4289 /* If a BLKmode arrives in registers, copy it to a stack slot.
4290 Handle calls that pass values in multiple non-contiguous
4291 locations. The Irix 6 ABI has examples of this. */
4292 if (GET_CODE (entry_parm
) == REG
4293 || GET_CODE (entry_parm
) == PARALLEL
)
4296 = CEIL_ROUND (int_size_in_bytes (TREE_TYPE (parm
)),
4299 /* Note that we will be storing an integral number of words.
4300 So we have to be careful to ensure that we allocate an
4301 integral number of words. We do this below in the
4302 assign_stack_local if space was not allocated in the argument
4303 list. If it was, this will not work if PARM_BOUNDARY is not
4304 a multiple of BITS_PER_WORD. It isn't clear how to fix this
4305 if it becomes a problem. */
4307 if (stack_parm
== 0)
4310 = assign_stack_local (GET_MODE (entry_parm
),
4313 /* If this is a memory ref that contains aggregate
4314 components, mark it as such for cse and loop optimize. */
4315 MEM_SET_IN_STRUCT_P (stack_parm
, aggregate
);
4318 else if (PARM_BOUNDARY
% BITS_PER_WORD
!= 0)
4321 if (TREE_READONLY (parm
))
4322 RTX_UNCHANGING_P (stack_parm
) = 1;
4324 /* Handle calls that pass values in multiple non-contiguous
4325 locations. The Irix 6 ABI has examples of this. */
4326 if (GET_CODE (entry_parm
) == PARALLEL
)
4327 emit_group_store (validize_mem (stack_parm
), entry_parm
,
4328 int_size_in_bytes (TREE_TYPE (parm
)),
4329 (TYPE_ALIGN (TREE_TYPE (parm
))
4332 move_block_from_reg (REGNO (entry_parm
),
4333 validize_mem (stack_parm
),
4334 size_stored
/ UNITS_PER_WORD
,
4335 int_size_in_bytes (TREE_TYPE (parm
)));
4337 DECL_RTL (parm
) = stack_parm
;
4339 else if (! ((obey_regdecls
&& ! DECL_REGISTER (parm
)
4340 && ! DECL_INLINE (fndecl
))
4341 /* layout_decl may set this. */
4342 || TREE_ADDRESSABLE (parm
)
4343 || TREE_SIDE_EFFECTS (parm
)
4344 /* If -ffloat-store specified, don't put explicit
4345 float variables into registers. */
4346 || (flag_float_store
4347 && TREE_CODE (TREE_TYPE (parm
)) == REAL_TYPE
))
4348 /* Always assign pseudo to structure return or item passed
4349 by invisible reference. */
4350 || passed_pointer
|| parm
== function_result_decl
)
4352 /* Store the parm in a pseudoregister during the function, but we
4353 may need to do it in a wider mode. */
4355 register rtx parmreg
;
4356 int regno
, regnoi
= 0, regnor
= 0;
4358 unsignedp
= TREE_UNSIGNED (TREE_TYPE (parm
));
4360 promoted_nominal_mode
4361 = promote_mode (TREE_TYPE (parm
), nominal_mode
, &unsignedp
, 0);
4363 parmreg
= gen_reg_rtx (promoted_nominal_mode
);
4364 mark_user_reg (parmreg
);
4366 /* If this was an item that we received a pointer to, set DECL_RTL
4371 = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (passed_type
)), parmreg
);
4372 MEM_SET_IN_STRUCT_P (DECL_RTL (parm
), aggregate
);
4375 DECL_RTL (parm
) = parmreg
;
4377 /* Copy the value into the register. */
4378 if (nominal_mode
!= passed_mode
4379 || promoted_nominal_mode
!= promoted_mode
)
4382 /* ENTRY_PARM has been converted to PROMOTED_MODE, its
4383 mode, by the caller. We now have to convert it to
4384 NOMINAL_MODE, if different. However, PARMREG may be in
4385 a different mode than NOMINAL_MODE if it is being stored
4388 If ENTRY_PARM is a hard register, it might be in a register
4389 not valid for operating in its mode (e.g., an odd-numbered
4390 register for a DFmode). In that case, moves are the only
4391 thing valid, so we can't do a convert from there. This
4392 occurs when the calling sequence allow such misaligned
4395 In addition, the conversion may involve a call, which could
4396 clobber parameters which haven't been copied to pseudo
4397 registers yet. Therefore, we must first copy the parm to
4398 a pseudo reg here, and save the conversion until after all
4399 parameters have been moved. */
4401 rtx tempreg
= gen_reg_rtx (GET_MODE (entry_parm
));
4403 emit_move_insn (tempreg
, validize_mem (entry_parm
));
4405 push_to_sequence (conversion_insns
);
4406 tempreg
= convert_to_mode (nominal_mode
, tempreg
, unsignedp
);
4408 /* TREE_USED gets set erroneously during expand_assignment. */
4409 save_tree_used
= TREE_USED (parm
);
4410 expand_assignment (parm
,
4411 make_tree (nominal_type
, tempreg
), 0, 0);
4412 TREE_USED (parm
) = save_tree_used
;
4413 conversion_insns
= get_insns ();
4418 emit_move_insn (parmreg
, validize_mem (entry_parm
));
4420 /* If we were passed a pointer but the actual value
4421 can safely live in a register, put it in one. */
4422 if (passed_pointer
&& TYPE_MODE (TREE_TYPE (parm
)) != BLKmode
4423 && ! ((obey_regdecls
&& ! DECL_REGISTER (parm
)
4424 && ! DECL_INLINE (fndecl
))
4425 /* layout_decl may set this. */
4426 || TREE_ADDRESSABLE (parm
)
4427 || TREE_SIDE_EFFECTS (parm
)
4428 /* If -ffloat-store specified, don't put explicit
4429 float variables into registers. */
4430 || (flag_float_store
4431 && TREE_CODE (TREE_TYPE (parm
)) == REAL_TYPE
)))
4433 /* We can't use nominal_mode, because it will have been set to
4434 Pmode above. We must use the actual mode of the parm. */
4435 parmreg
= gen_reg_rtx (TYPE_MODE (TREE_TYPE (parm
)));
4436 mark_user_reg (parmreg
);
4437 emit_move_insn (parmreg
, DECL_RTL (parm
));
4438 DECL_RTL (parm
) = parmreg
;
4439 /* STACK_PARM is the pointer, not the parm, and PARMREG is
4443 #ifdef FUNCTION_ARG_CALLEE_COPIES
4444 /* If we are passed an arg by reference and it is our responsibility
4445 to make a copy, do it now.
4446 PASSED_TYPE and PASSED mode now refer to the pointer, not the
4447 original argument, so we must recreate them in the call to
4448 FUNCTION_ARG_CALLEE_COPIES. */
4449 /* ??? Later add code to handle the case that if the argument isn't
4450 modified, don't do the copy. */
4452 else if (passed_pointer
4453 && FUNCTION_ARG_CALLEE_COPIES (args_so_far
,
4454 TYPE_MODE (DECL_ARG_TYPE (parm
)),
4455 DECL_ARG_TYPE (parm
),
4457 && ! TREE_ADDRESSABLE (DECL_ARG_TYPE (parm
)))
4460 tree type
= DECL_ARG_TYPE (parm
);
4462 /* This sequence may involve a library call perhaps clobbering
4463 registers that haven't been copied to pseudos yet. */
4465 push_to_sequence (conversion_insns
);
4467 if (TYPE_SIZE (type
) == 0
4468 || TREE_CODE (TYPE_SIZE (type
)) != INTEGER_CST
)
4469 /* This is a variable sized object. */
4470 copy
= gen_rtx_MEM (BLKmode
,
4471 allocate_dynamic_stack_space
4472 (expr_size (parm
), NULL_RTX
,
4473 TYPE_ALIGN (type
)));
4475 copy
= assign_stack_temp (TYPE_MODE (type
),
4476 int_size_in_bytes (type
), 1);
4477 MEM_SET_IN_STRUCT_P (copy
, AGGREGATE_TYPE_P (type
));
4478 RTX_UNCHANGING_P (copy
) = TREE_READONLY (parm
);
4480 store_expr (parm
, copy
, 0);
4481 emit_move_insn (parmreg
, XEXP (copy
, 0));
4482 if (current_function_check_memory_usage
)
4483 emit_library_call (chkr_set_right_libfunc
, 1, VOIDmode
, 3,
4484 XEXP (copy
, 0), ptr_mode
,
4485 GEN_INT (int_size_in_bytes (type
)),
4486 TYPE_MODE (sizetype
),
4487 GEN_INT (MEMORY_USE_RW
),
4488 TYPE_MODE (integer_type_node
));
4489 conversion_insns
= get_insns ();
4493 #endif /* FUNCTION_ARG_CALLEE_COPIES */
4495 /* In any case, record the parm's desired stack location
4496 in case we later discover it must live in the stack.
4498 If it is a COMPLEX value, store the stack location for both
4501 if (GET_CODE (parmreg
) == CONCAT
)
4502 regno
= MAX (REGNO (XEXP (parmreg
, 0)), REGNO (XEXP (parmreg
, 1)));
4504 regno
= REGNO (parmreg
);
4506 if (regno
>= max_parm_reg
)
4509 int old_max_parm_reg
= max_parm_reg
;
4511 /* It's slow to expand this one register at a time,
4512 but it's also rare and we need max_parm_reg to be
4513 precisely correct. */
4514 max_parm_reg
= regno
+ 1;
4515 new = (rtx
*) savealloc (max_parm_reg
* sizeof (rtx
));
4516 bcopy ((char *) parm_reg_stack_loc
, (char *) new,
4517 old_max_parm_reg
* sizeof (rtx
));
4518 bzero ((char *) (new + old_max_parm_reg
),
4519 (max_parm_reg
- old_max_parm_reg
) * sizeof (rtx
));
4520 parm_reg_stack_loc
= new;
4523 if (GET_CODE (parmreg
) == CONCAT
)
4525 enum machine_mode submode
= GET_MODE (XEXP (parmreg
, 0));
4527 regnor
= REGNO (gen_realpart (submode
, parmreg
));
4528 regnoi
= REGNO (gen_imagpart (submode
, parmreg
));
4530 if (stack_parm
!= 0)
4532 parm_reg_stack_loc
[regnor
]
4533 = gen_realpart (submode
, stack_parm
);
4534 parm_reg_stack_loc
[regnoi
]
4535 = gen_imagpart (submode
, stack_parm
);
4539 parm_reg_stack_loc
[regnor
] = 0;
4540 parm_reg_stack_loc
[regnoi
] = 0;
4544 parm_reg_stack_loc
[REGNO (parmreg
)] = stack_parm
;
4546 /* Mark the register as eliminable if we did no conversion
4547 and it was copied from memory at a fixed offset,
4548 and the arg pointer was not copied to a pseudo-reg.
4549 If the arg pointer is a pseudo reg or the offset formed
4550 an invalid address, such memory-equivalences
4551 as we make here would screw up life analysis for it. */
4552 if (nominal_mode
== passed_mode
4555 && GET_CODE (stack_parm
) == MEM
4556 && stack_offset
.var
== 0
4557 && reg_mentioned_p (virtual_incoming_args_rtx
,
4558 XEXP (stack_parm
, 0)))
4560 rtx linsn
= get_last_insn ();
4563 /* Mark complex types separately. */
4564 if (GET_CODE (parmreg
) == CONCAT
)
4565 /* Scan backwards for the set of the real and
4567 for (sinsn
= linsn
; sinsn
!= 0;
4568 sinsn
= prev_nonnote_insn (sinsn
))
4570 set
= single_set (sinsn
);
4572 && SET_DEST (set
) == regno_reg_rtx
[regnoi
])
4574 = gen_rtx_EXPR_LIST (REG_EQUIV
,
4575 parm_reg_stack_loc
[regnoi
],
4578 && SET_DEST (set
) == regno_reg_rtx
[regnor
])
4580 = gen_rtx_EXPR_LIST (REG_EQUIV
,
4581 parm_reg_stack_loc
[regnor
],
4584 else if ((set
= single_set (linsn
)) != 0
4585 && SET_DEST (set
) == parmreg
)
4587 = gen_rtx_EXPR_LIST (REG_EQUIV
,
4588 stack_parm
, REG_NOTES (linsn
));
4591 /* For pointer data type, suggest pointer register. */
4592 if (POINTER_TYPE_P (TREE_TYPE (parm
)))
4593 mark_reg_pointer (parmreg
,
4594 (TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm
)))
4599 /* Value must be stored in the stack slot STACK_PARM
4600 during function execution. */
4602 if (promoted_mode
!= nominal_mode
)
4604 /* Conversion is required. */
4605 rtx tempreg
= gen_reg_rtx (GET_MODE (entry_parm
));
4607 emit_move_insn (tempreg
, validize_mem (entry_parm
));
4609 push_to_sequence (conversion_insns
);
4610 entry_parm
= convert_to_mode (nominal_mode
, tempreg
,
4611 TREE_UNSIGNED (TREE_TYPE (parm
)));
4614 /* ??? This may need a big-endian conversion on sparc64. */
4615 stack_parm
= change_address (stack_parm
, nominal_mode
,
4618 conversion_insns
= get_insns ();
4623 if (entry_parm
!= stack_parm
)
4625 if (stack_parm
== 0)
4628 = assign_stack_local (GET_MODE (entry_parm
),
4629 GET_MODE_SIZE (GET_MODE (entry_parm
)), 0);
4630 /* If this is a memory ref that contains aggregate components,
4631 mark it as such for cse and loop optimize. */
4632 MEM_SET_IN_STRUCT_P (stack_parm
, aggregate
);
4635 if (promoted_mode
!= nominal_mode
)
4637 push_to_sequence (conversion_insns
);
4638 emit_move_insn (validize_mem (stack_parm
),
4639 validize_mem (entry_parm
));
4640 conversion_insns
= get_insns ();
4644 emit_move_insn (validize_mem (stack_parm
),
4645 validize_mem (entry_parm
));
4647 if (current_function_check_memory_usage
)
4649 push_to_sequence (conversion_insns
);
4650 emit_library_call (chkr_set_right_libfunc
, 1, VOIDmode
, 3,
4651 XEXP (stack_parm
, 0), ptr_mode
,
4652 GEN_INT (GET_MODE_SIZE (GET_MODE
4654 TYPE_MODE (sizetype
),
4655 GEN_INT (MEMORY_USE_RW
),
4656 TYPE_MODE (integer_type_node
));
4658 conversion_insns
= get_insns ();
4661 DECL_RTL (parm
) = stack_parm
;
4664 /* If this "parameter" was the place where we are receiving the
4665 function's incoming structure pointer, set up the result. */
4666 if (parm
== function_result_decl
)
4668 tree result
= DECL_RESULT (fndecl
);
4669 tree restype
= TREE_TYPE (result
);
4672 = gen_rtx_MEM (DECL_MODE (result
), DECL_RTL (parm
));
4674 MEM_SET_IN_STRUCT_P (DECL_RTL (result
),
4675 AGGREGATE_TYPE_P (restype
));
4678 if (TREE_THIS_VOLATILE (parm
))
4679 MEM_VOLATILE_P (DECL_RTL (parm
)) = 1;
4680 if (TREE_READONLY (parm
))
4681 RTX_UNCHANGING_P (DECL_RTL (parm
)) = 1;
4684 /* Output all parameter conversion instructions (possibly including calls)
4685 now that all parameters have been copied out of hard registers. */
4686 emit_insns (conversion_insns
);
4688 last_parm_insn
= get_last_insn ();
4690 current_function_args_size
= stack_args_size
.constant
;
4692 /* Adjust function incoming argument size for alignment and
4695 #ifdef REG_PARM_STACK_SPACE
4696 #ifndef MAYBE_REG_PARM_STACK_SPACE
4697 current_function_args_size
= MAX (current_function_args_size
,
4698 REG_PARM_STACK_SPACE (fndecl
));
4702 #ifdef PREFERRED_STACK_BOUNDARY
4703 #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT)
4705 current_function_args_size
4706 = ((current_function_args_size
+ STACK_BYTES
- 1)
4707 / STACK_BYTES
) * STACK_BYTES
;
4710 #ifdef ARGS_GROW_DOWNWARD
4711 current_function_arg_offset_rtx
4712 = (stack_args_size
.var
== 0 ? GEN_INT (-stack_args_size
.constant
)
4713 : expand_expr (size_binop (MINUS_EXPR
, stack_args_size
.var
,
4714 size_int (-stack_args_size
.constant
)),
4715 NULL_RTX
, VOIDmode
, EXPAND_MEMORY_USE_BAD
));
4717 current_function_arg_offset_rtx
= ARGS_SIZE_RTX (stack_args_size
);
4720 /* See how many bytes, if any, of its args a function should try to pop
4723 current_function_pops_args
= RETURN_POPS_ARGS (fndecl
, TREE_TYPE (fndecl
),
4724 current_function_args_size
);
4726 /* For stdarg.h function, save info about
4727 regs and stack space used by the named args. */
4730 current_function_args_info
= args_so_far
;
4732 /* Set the rtx used for the function return value. Put this in its
4733 own variable so any optimizers that need this information don't have
4734 to include tree.h. Do this here so it gets done when an inlined
4735 function gets output. */
4737 current_function_return_rtx
= DECL_RTL (DECL_RESULT (fndecl
));
4740 /* Indicate whether REGNO is an incoming argument to the current function
4741 that was promoted to a wider mode. If so, return the RTX for the
4742 register (to get its mode). PMODE and PUNSIGNEDP are set to the mode
4743 that REGNO is promoted from and whether the promotion was signed or
4746 #ifdef PROMOTE_FUNCTION_ARGS
4749 promoted_input_arg (regno
, pmode
, punsignedp
)
4751 enum machine_mode
*pmode
;
4756 for (arg
= DECL_ARGUMENTS (current_function_decl
); arg
;
4757 arg
= TREE_CHAIN (arg
))
4758 if (GET_CODE (DECL_INCOMING_RTL (arg
)) == REG
4759 && REGNO (DECL_INCOMING_RTL (arg
)) == regno
4760 && TYPE_MODE (DECL_ARG_TYPE (arg
)) == TYPE_MODE (TREE_TYPE (arg
)))
4762 enum machine_mode mode
= TYPE_MODE (TREE_TYPE (arg
));
4763 int unsignedp
= TREE_UNSIGNED (TREE_TYPE (arg
));
4765 mode
= promote_mode (TREE_TYPE (arg
), mode
, &unsignedp
, 1);
4766 if (mode
== GET_MODE (DECL_INCOMING_RTL (arg
))
4767 && mode
!= DECL_MODE (arg
))
4769 *pmode
= DECL_MODE (arg
);
4770 *punsignedp
= unsignedp
;
4771 return DECL_INCOMING_RTL (arg
);
4780 /* Compute the size and offset from the start of the stacked arguments for a
4781 parm passed in mode PASSED_MODE and with type TYPE.
4783 INITIAL_OFFSET_PTR points to the current offset into the stacked
4786 The starting offset and size for this parm are returned in *OFFSET_PTR
4787 and *ARG_SIZE_PTR, respectively.
4789 IN_REGS is non-zero if the argument will be passed in registers. It will
4790 never be set if REG_PARM_STACK_SPACE is not defined.
4792 FNDECL is the function in which the argument was defined.
4794 There are two types of rounding that are done. The first, controlled by
4795 FUNCTION_ARG_BOUNDARY, forces the offset from the start of the argument
4796 list to be aligned to the specific boundary (in bits). This rounding
4797 affects the initial and starting offsets, but not the argument size.
4799 The second, controlled by FUNCTION_ARG_PADDING and PARM_BOUNDARY,
4800 optionally rounds the size of the parm to PARM_BOUNDARY. The
4801 initial offset is not affected by this rounding, while the size always
4802 is and the starting offset may be. */
4804 /* offset_ptr will be negative for ARGS_GROW_DOWNWARD case;
4805 initial_offset_ptr is positive because locate_and_pad_parm's
4806 callers pass in the total size of args so far as
4807 initial_offset_ptr. arg_size_ptr is always positive.*/
4810 locate_and_pad_parm (passed_mode
, type
, in_regs
, fndecl
,
4811 initial_offset_ptr
, offset_ptr
, arg_size_ptr
)
4812 enum machine_mode passed_mode
;
4816 struct args_size
*initial_offset_ptr
;
4817 struct args_size
*offset_ptr
;
4818 struct args_size
*arg_size_ptr
;
4821 = type
? size_in_bytes (type
) : size_int (GET_MODE_SIZE (passed_mode
));
4822 enum direction where_pad
= FUNCTION_ARG_PADDING (passed_mode
, type
);
4823 int boundary
= FUNCTION_ARG_BOUNDARY (passed_mode
, type
);
4825 #ifdef REG_PARM_STACK_SPACE
4826 /* If we have found a stack parm before we reach the end of the
4827 area reserved for registers, skip that area. */
4830 int reg_parm_stack_space
= 0;
4832 #ifdef MAYBE_REG_PARM_STACK_SPACE
4833 reg_parm_stack_space
= MAYBE_REG_PARM_STACK_SPACE
;
4835 reg_parm_stack_space
= REG_PARM_STACK_SPACE (fndecl
);
4837 if (reg_parm_stack_space
> 0)
4839 if (initial_offset_ptr
->var
)
4841 initial_offset_ptr
->var
4842 = size_binop (MAX_EXPR
, ARGS_SIZE_TREE (*initial_offset_ptr
),
4843 size_int (reg_parm_stack_space
));
4844 initial_offset_ptr
->constant
= 0;
4846 else if (initial_offset_ptr
->constant
< reg_parm_stack_space
)
4847 initial_offset_ptr
->constant
= reg_parm_stack_space
;
4850 #endif /* REG_PARM_STACK_SPACE */
4852 arg_size_ptr
->var
= 0;
4853 arg_size_ptr
->constant
= 0;
4855 #ifdef ARGS_GROW_DOWNWARD
4856 if (initial_offset_ptr
->var
)
4858 offset_ptr
->constant
= 0;
4859 offset_ptr
->var
= size_binop (MINUS_EXPR
, integer_zero_node
,
4860 initial_offset_ptr
->var
);
4864 offset_ptr
->constant
= - initial_offset_ptr
->constant
;
4865 offset_ptr
->var
= 0;
4867 if (where_pad
!= none
4868 && (TREE_CODE (sizetree
) != INTEGER_CST
4869 || ((TREE_INT_CST_LOW (sizetree
) * BITS_PER_UNIT
) % PARM_BOUNDARY
)))
4870 sizetree
= round_up (sizetree
, PARM_BOUNDARY
/ BITS_PER_UNIT
);
4871 SUB_PARM_SIZE (*offset_ptr
, sizetree
);
4872 if (where_pad
!= downward
)
4873 pad_to_arg_alignment (offset_ptr
, boundary
);
4874 if (initial_offset_ptr
->var
)
4876 arg_size_ptr
->var
= size_binop (MINUS_EXPR
,
4877 size_binop (MINUS_EXPR
,
4879 initial_offset_ptr
->var
),
4884 arg_size_ptr
->constant
= (- initial_offset_ptr
->constant
4885 - offset_ptr
->constant
);
4887 #else /* !ARGS_GROW_DOWNWARD */
4888 pad_to_arg_alignment (initial_offset_ptr
, boundary
);
4889 *offset_ptr
= *initial_offset_ptr
;
4891 #ifdef PUSH_ROUNDING
4892 if (passed_mode
!= BLKmode
)
4893 sizetree
= size_int (PUSH_ROUNDING (TREE_INT_CST_LOW (sizetree
)));
4896 /* Pad_below needs the pre-rounded size to know how much to pad below
4897 so this must be done before rounding up. */
4898 if (where_pad
== downward
4899 /* However, BLKmode args passed in regs have their padding done elsewhere.
4900 The stack slot must be able to hold the entire register. */
4901 && !(in_regs
&& passed_mode
== BLKmode
))
4902 pad_below (offset_ptr
, passed_mode
, sizetree
);
4904 if (where_pad
!= none
4905 && (TREE_CODE (sizetree
) != INTEGER_CST
4906 || ((TREE_INT_CST_LOW (sizetree
) * BITS_PER_UNIT
) % PARM_BOUNDARY
)))
4907 sizetree
= round_up (sizetree
, PARM_BOUNDARY
/ BITS_PER_UNIT
);
4909 ADD_PARM_SIZE (*arg_size_ptr
, sizetree
);
4910 #endif /* ARGS_GROW_DOWNWARD */
4913 /* Round the stack offset in *OFFSET_PTR up to a multiple of BOUNDARY.
4914 BOUNDARY is measured in bits, but must be a multiple of a storage unit. */
4917 pad_to_arg_alignment (offset_ptr
, boundary
)
4918 struct args_size
*offset_ptr
;
4921 int boundary_in_bytes
= boundary
/ BITS_PER_UNIT
;
4923 if (boundary
> BITS_PER_UNIT
)
4925 if (offset_ptr
->var
)
4928 #ifdef ARGS_GROW_DOWNWARD
4933 (ARGS_SIZE_TREE (*offset_ptr
),
4934 boundary
/ BITS_PER_UNIT
);
4935 offset_ptr
->constant
= 0; /*?*/
4938 offset_ptr
->constant
=
4939 #ifdef ARGS_GROW_DOWNWARD
4940 FLOOR_ROUND (offset_ptr
->constant
, boundary_in_bytes
);
4942 CEIL_ROUND (offset_ptr
->constant
, boundary_in_bytes
);
4947 #ifndef ARGS_GROW_DOWNWARD
4949 pad_below (offset_ptr
, passed_mode
, sizetree
)
4950 struct args_size
*offset_ptr
;
4951 enum machine_mode passed_mode
;
4954 if (passed_mode
!= BLKmode
)
4956 if (GET_MODE_BITSIZE (passed_mode
) % PARM_BOUNDARY
)
4957 offset_ptr
->constant
4958 += (((GET_MODE_BITSIZE (passed_mode
) + PARM_BOUNDARY
- 1)
4959 / PARM_BOUNDARY
* PARM_BOUNDARY
/ BITS_PER_UNIT
)
4960 - GET_MODE_SIZE (passed_mode
));
4964 if (TREE_CODE (sizetree
) != INTEGER_CST
4965 || (TREE_INT_CST_LOW (sizetree
) * BITS_PER_UNIT
) % PARM_BOUNDARY
)
4967 /* Round the size up to multiple of PARM_BOUNDARY bits. */
4968 tree s2
= round_up (sizetree
, PARM_BOUNDARY
/ BITS_PER_UNIT
);
4970 ADD_PARM_SIZE (*offset_ptr
, s2
);
4971 SUB_PARM_SIZE (*offset_ptr
, sizetree
);
4977 #ifdef ARGS_GROW_DOWNWARD
4979 round_down (value
, divisor
)
4983 return size_binop (MULT_EXPR
,
4984 size_binop (FLOOR_DIV_EXPR
, value
, size_int (divisor
)),
4985 size_int (divisor
));
4989 /* Walk the tree of blocks describing the binding levels within a function
4990 and warn about uninitialized variables.
4991 This is done after calling flow_analysis and before global_alloc
4992 clobbers the pseudo-regs to hard regs. */
4995 uninitialized_vars_warning (block
)
4998 register tree decl
, sub
;
4999 for (decl
= BLOCK_VARS (block
); decl
; decl
= TREE_CHAIN (decl
))
5001 if (TREE_CODE (decl
) == VAR_DECL
5002 /* These warnings are unreliable for and aggregates
5003 because assigning the fields one by one can fail to convince
5004 flow.c that the entire aggregate was initialized.
5005 Unions are troublesome because members may be shorter. */
5006 && ! AGGREGATE_TYPE_P (TREE_TYPE (decl
))
5007 && DECL_RTL (decl
) != 0
5008 && GET_CODE (DECL_RTL (decl
)) == REG
5009 /* Global optimizations can make it difficult to determine if a
5010 particular variable has been initialized. However, a VAR_DECL
5011 with a nonzero DECL_INITIAL had an initializer, so do not
5012 claim it is potentially uninitialized.
5014 We do not care about the actual value in DECL_INITIAL, so we do
5015 not worry that it may be a dangling pointer. */
5016 && DECL_INITIAL (decl
) == NULL_TREE
5017 && regno_uninitialized (REGNO (DECL_RTL (decl
))))
5018 warning_with_decl (decl
,
5019 "`%s' might be used uninitialized in this function");
5020 if (TREE_CODE (decl
) == VAR_DECL
5021 && DECL_RTL (decl
) != 0
5022 && GET_CODE (DECL_RTL (decl
)) == REG
5023 && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl
))))
5024 warning_with_decl (decl
,
5025 "variable `%s' might be clobbered by `longjmp' or `vfork'");
5027 for (sub
= BLOCK_SUBBLOCKS (block
); sub
; sub
= TREE_CHAIN (sub
))
5028 uninitialized_vars_warning (sub
);
5031 /* Do the appropriate part of uninitialized_vars_warning
5032 but for arguments instead of local variables. */
5035 setjmp_args_warning ()
5038 for (decl
= DECL_ARGUMENTS (current_function_decl
);
5039 decl
; decl
= TREE_CHAIN (decl
))
5040 if (DECL_RTL (decl
) != 0
5041 && GET_CODE (DECL_RTL (decl
)) == REG
5042 && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl
))))
5043 warning_with_decl (decl
, "argument `%s' might be clobbered by `longjmp' or `vfork'");
5046 /* If this function call setjmp, put all vars into the stack
5047 unless they were declared `register'. */
5050 setjmp_protect (block
)
5053 register tree decl
, sub
;
5054 for (decl
= BLOCK_VARS (block
); decl
; decl
= TREE_CHAIN (decl
))
5055 if ((TREE_CODE (decl
) == VAR_DECL
5056 || TREE_CODE (decl
) == PARM_DECL
)
5057 && DECL_RTL (decl
) != 0
5058 && (GET_CODE (DECL_RTL (decl
)) == REG
5059 || (GET_CODE (DECL_RTL (decl
)) == MEM
5060 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == ADDRESSOF
))
5061 /* If this variable came from an inline function, it must be
5062 that its life doesn't overlap the setjmp. If there was a
5063 setjmp in the function, it would already be in memory. We
5064 must exclude such variable because their DECL_RTL might be
5065 set to strange things such as virtual_stack_vars_rtx. */
5066 && ! DECL_FROM_INLINE (decl
)
5068 #ifdef NON_SAVING_SETJMP
5069 /* If longjmp doesn't restore the registers,
5070 don't put anything in them. */
5074 ! DECL_REGISTER (decl
)))
5075 put_var_into_stack (decl
);
5076 for (sub
= BLOCK_SUBBLOCKS (block
); sub
; sub
= TREE_CHAIN (sub
))
5077 setjmp_protect (sub
);
5080 /* Like the previous function, but for args instead of local variables. */
5083 setjmp_protect_args ()
5086 for (decl
= DECL_ARGUMENTS (current_function_decl
);
5087 decl
; decl
= TREE_CHAIN (decl
))
5088 if ((TREE_CODE (decl
) == VAR_DECL
5089 || TREE_CODE (decl
) == PARM_DECL
)
5090 && DECL_RTL (decl
) != 0
5091 && (GET_CODE (DECL_RTL (decl
)) == REG
5092 || (GET_CODE (DECL_RTL (decl
)) == MEM
5093 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == ADDRESSOF
))
5095 /* If longjmp doesn't restore the registers,
5096 don't put anything in them. */
5097 #ifdef NON_SAVING_SETJMP
5101 ! DECL_REGISTER (decl
)))
5102 put_var_into_stack (decl
);
5105 /* Return the context-pointer register corresponding to DECL,
5106 or 0 if it does not need one. */
5109 lookup_static_chain (decl
)
5112 tree context
= decl_function_context (decl
);
5116 || (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_NO_STATIC_CHAIN (decl
)))
5119 /* We treat inline_function_decl as an alias for the current function
5120 because that is the inline function whose vars, types, etc.
5121 are being merged into the current function.
5122 See expand_inline_function. */
5123 if (context
== current_function_decl
|| context
== inline_function_decl
)
5124 return virtual_stack_vars_rtx
;
5126 for (link
= context_display
; link
; link
= TREE_CHAIN (link
))
5127 if (TREE_PURPOSE (link
) == context
)
5128 return RTL_EXPR_RTL (TREE_VALUE (link
));
5133 /* Convert a stack slot address ADDR for variable VAR
5134 (from a containing function)
5135 into an address valid in this function (using a static chain). */
5138 fix_lexical_addr (addr
, var
)
5143 HOST_WIDE_INT displacement
;
5144 tree context
= decl_function_context (var
);
5145 struct function
*fp
;
5148 /* If this is the present function, we need not do anything. */
5149 if (context
== current_function_decl
|| context
== inline_function_decl
)
5152 for (fp
= outer_function_chain
; fp
; fp
= fp
->next
)
5153 if (fp
->decl
== context
)
5159 if (GET_CODE (addr
) == ADDRESSOF
&& GET_CODE (XEXP (addr
, 0)) == MEM
)
5160 addr
= XEXP (XEXP (addr
, 0), 0);
5162 /* Decode given address as base reg plus displacement. */
5163 if (GET_CODE (addr
) == REG
)
5164 basereg
= addr
, displacement
= 0;
5165 else if (GET_CODE (addr
) == PLUS
&& GET_CODE (XEXP (addr
, 1)) == CONST_INT
)
5166 basereg
= XEXP (addr
, 0), displacement
= INTVAL (XEXP (addr
, 1));
5170 /* We accept vars reached via the containing function's
5171 incoming arg pointer and via its stack variables pointer. */
5172 if (basereg
== fp
->internal_arg_pointer
)
5174 /* If reached via arg pointer, get the arg pointer value
5175 out of that function's stack frame.
5177 There are two cases: If a separate ap is needed, allocate a
5178 slot in the outer function for it and dereference it that way.
5179 This is correct even if the real ap is actually a pseudo.
5180 Otherwise, just adjust the offset from the frame pointer to
5183 #ifdef NEED_SEPARATE_AP
5186 if (fp
->arg_pointer_save_area
== 0)
5187 fp
->arg_pointer_save_area
5188 = assign_outer_stack_local (Pmode
, GET_MODE_SIZE (Pmode
), 0, fp
);
5190 addr
= fix_lexical_addr (XEXP (fp
->arg_pointer_save_area
, 0), var
);
5191 addr
= memory_address (Pmode
, addr
);
5193 base
= copy_to_reg (gen_rtx_MEM (Pmode
, addr
));
5195 displacement
+= (FIRST_PARM_OFFSET (context
) - STARTING_FRAME_OFFSET
);
5196 base
= lookup_static_chain (var
);
5200 else if (basereg
== virtual_stack_vars_rtx
)
5202 /* This is the same code as lookup_static_chain, duplicated here to
5203 avoid an extra call to decl_function_context. */
5206 for (link
= context_display
; link
; link
= TREE_CHAIN (link
))
5207 if (TREE_PURPOSE (link
) == context
)
5209 base
= RTL_EXPR_RTL (TREE_VALUE (link
));
5217 /* Use same offset, relative to appropriate static chain or argument
5219 return plus_constant (base
, displacement
);
5222 /* Return the address of the trampoline for entering nested fn FUNCTION.
5223 If necessary, allocate a trampoline (in the stack frame)
5224 and emit rtl to initialize its contents (at entry to this function). */
5227 trampoline_address (function
)
5233 struct function
*fp
;
5236 /* Find an existing trampoline and return it. */
5237 for (link
= trampoline_list
; link
; link
= TREE_CHAIN (link
))
5238 if (TREE_PURPOSE (link
) == function
)
5240 round_trampoline_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link
)), 0));
5242 for (fp
= outer_function_chain
; fp
; fp
= fp
->next
)
5243 for (link
= fp
->trampoline_list
; link
; link
= TREE_CHAIN (link
))
5244 if (TREE_PURPOSE (link
) == function
)
5246 tramp
= fix_lexical_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link
)), 0),
5248 return round_trampoline_addr (tramp
);
5251 /* None exists; we must make one. */
5253 /* Find the `struct function' for the function containing FUNCTION. */
5255 fn_context
= decl_function_context (function
);
5256 if (fn_context
!= current_function_decl
5257 && fn_context
!= inline_function_decl
)
5258 for (fp
= outer_function_chain
; fp
; fp
= fp
->next
)
5259 if (fp
->decl
== fn_context
)
5262 /* Allocate run-time space for this trampoline
5263 (usually in the defining function's stack frame). */
5264 #ifdef ALLOCATE_TRAMPOLINE
5265 tramp
= ALLOCATE_TRAMPOLINE (fp
);
5267 /* If rounding needed, allocate extra space
5268 to ensure we have TRAMPOLINE_SIZE bytes left after rounding up. */
5269 #ifdef TRAMPOLINE_ALIGNMENT
5270 #define TRAMPOLINE_REAL_SIZE \
5271 (TRAMPOLINE_SIZE + (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT) - 1)
5273 #define TRAMPOLINE_REAL_SIZE (TRAMPOLINE_SIZE)
5276 tramp
= assign_outer_stack_local (BLKmode
, TRAMPOLINE_REAL_SIZE
, 0, fp
);
5278 tramp
= assign_stack_local (BLKmode
, TRAMPOLINE_REAL_SIZE
, 0);
5281 /* Record the trampoline for reuse and note it for later initialization
5282 by expand_function_end. */
5285 push_obstacks (fp
->function_maybepermanent_obstack
,
5286 fp
->function_maybepermanent_obstack
);
5287 rtlexp
= make_node (RTL_EXPR
);
5288 RTL_EXPR_RTL (rtlexp
) = tramp
;
5289 fp
->trampoline_list
= tree_cons (function
, rtlexp
, fp
->trampoline_list
);
5294 /* Make the RTL_EXPR node temporary, not momentary, so that the
5295 trampoline_list doesn't become garbage. */
5296 int momentary
= suspend_momentary ();
5297 rtlexp
= make_node (RTL_EXPR
);
5298 resume_momentary (momentary
);
5300 RTL_EXPR_RTL (rtlexp
) = tramp
;
5301 trampoline_list
= tree_cons (function
, rtlexp
, trampoline_list
);
5304 tramp
= fix_lexical_addr (XEXP (tramp
, 0), function
);
5305 return round_trampoline_addr (tramp
);
5308 /* Given a trampoline address,
5309 round it to multiple of TRAMPOLINE_ALIGNMENT. */
5312 round_trampoline_addr (tramp
)
5315 #ifdef TRAMPOLINE_ALIGNMENT
5316 /* Round address up to desired boundary. */
5317 rtx temp
= gen_reg_rtx (Pmode
);
5318 temp
= expand_binop (Pmode
, add_optab
, tramp
,
5319 GEN_INT (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
- 1),
5320 temp
, 0, OPTAB_LIB_WIDEN
);
5321 tramp
= expand_binop (Pmode
, and_optab
, temp
,
5322 GEN_INT (- TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
),
5323 temp
, 0, OPTAB_LIB_WIDEN
);
5328 /* The functions identify_blocks and reorder_blocks provide a way to
5329 reorder the tree of BLOCK nodes, for optimizers that reshuffle or
5330 duplicate portions of the RTL code. Call identify_blocks before
5331 changing the RTL, and call reorder_blocks after. */
5333 /* Put all this function's BLOCK nodes including those that are chained
5334 onto the first block into a vector, and return it.
5335 Also store in each NOTE for the beginning or end of a block
5336 the index of that block in the vector.
5337 The arguments are BLOCK, the chain of top-level blocks of the function,
5338 and INSNS, the insn chain of the function. */
5341 identify_blocks (block
, insns
)
5349 int next_block_number
= 1;
5350 int current_block_number
= 1;
5356 n_blocks
= all_blocks (block
, 0);
5357 block_vector
= (tree
*) xmalloc (n_blocks
* sizeof (tree
));
5358 block_stack
= (int *) alloca (n_blocks
* sizeof (int));
5360 all_blocks (block
, block_vector
);
5362 for (insn
= insns
; insn
; insn
= NEXT_INSN (insn
))
5363 if (GET_CODE (insn
) == NOTE
)
5365 if (NOTE_LINE_NUMBER (insn
) == NOTE_INSN_BLOCK_BEG
)
5367 block_stack
[depth
++] = current_block_number
;
5368 current_block_number
= next_block_number
;
5369 NOTE_BLOCK_NUMBER (insn
) = next_block_number
++;
5371 if (NOTE_LINE_NUMBER (insn
) == NOTE_INSN_BLOCK_END
)
5373 NOTE_BLOCK_NUMBER (insn
) = current_block_number
;
5374 current_block_number
= block_stack
[--depth
];
5378 if (n_blocks
!= next_block_number
)
5381 return block_vector
;
5384 /* Given BLOCK_VECTOR which was returned by identify_blocks,
5385 and a revised instruction chain, rebuild the tree structure
5386 of BLOCK nodes to correspond to the new order of RTL.
5387 The new block tree is inserted below TOP_BLOCK.
5388 Returns the current top-level block. */
5391 reorder_blocks (block_vector
, block
, insns
)
5396 tree current_block
= block
;
5399 if (block_vector
== 0)
5402 /* Prune the old trees away, so that it doesn't get in the way. */
5403 BLOCK_SUBBLOCKS (current_block
) = 0;
5404 BLOCK_CHAIN (current_block
) = 0;
5406 for (insn
= insns
; insn
; insn
= NEXT_INSN (insn
))
5407 if (GET_CODE (insn
) == NOTE
)
5409 if (NOTE_LINE_NUMBER (insn
) == NOTE_INSN_BLOCK_BEG
)
5411 tree block
= block_vector
[NOTE_BLOCK_NUMBER (insn
)];
5412 /* If we have seen this block before, copy it. */
5413 if (TREE_ASM_WRITTEN (block
))
5414 block
= copy_node (block
);
5415 BLOCK_SUBBLOCKS (block
) = 0;
5416 TREE_ASM_WRITTEN (block
) = 1;
5417 BLOCK_SUPERCONTEXT (block
) = current_block
;
5418 BLOCK_CHAIN (block
) = BLOCK_SUBBLOCKS (current_block
);
5419 BLOCK_SUBBLOCKS (current_block
) = block
;
5420 current_block
= block
;
5421 NOTE_SOURCE_FILE (insn
) = 0;
5423 if (NOTE_LINE_NUMBER (insn
) == NOTE_INSN_BLOCK_END
)
5425 BLOCK_SUBBLOCKS (current_block
)
5426 = blocks_nreverse (BLOCK_SUBBLOCKS (current_block
));
5427 current_block
= BLOCK_SUPERCONTEXT (current_block
);
5428 NOTE_SOURCE_FILE (insn
) = 0;
5432 BLOCK_SUBBLOCKS (current_block
)
5433 = blocks_nreverse (BLOCK_SUBBLOCKS (current_block
));
5434 return current_block
;
5437 /* Reverse the order of elements in the chain T of blocks,
5438 and return the new head of the chain (old last element). */
5444 register tree prev
= 0, decl
, next
;
5445 for (decl
= t
; decl
; decl
= next
)
5447 next
= BLOCK_CHAIN (decl
);
5448 BLOCK_CHAIN (decl
) = prev
;
5454 /* Count the subblocks of the list starting with BLOCK, and list them
5455 all into the vector VECTOR. Also clear TREE_ASM_WRITTEN in all
5459 all_blocks (block
, vector
)
5467 TREE_ASM_WRITTEN (block
) = 0;
5469 /* Record this block. */
5471 vector
[n_blocks
] = block
;
5475 /* Record the subblocks, and their subblocks... */
5476 n_blocks
+= all_blocks (BLOCK_SUBBLOCKS (block
),
5477 vector
? vector
+ n_blocks
: 0);
5478 block
= BLOCK_CHAIN (block
);
5484 /* Generate RTL for the start of the function SUBR (a FUNCTION_DECL tree node)
5485 and initialize static variables for generating RTL for the statements
5489 init_function_start (subr
, filename
, line
)
5494 init_stmt_for_function ();
5496 cse_not_expected
= ! optimize
;
5498 /* Caller save not needed yet. */
5499 caller_save_needed
= 0;
5501 /* No stack slots have been made yet. */
5502 stack_slot_list
= 0;
5504 /* There is no stack slot for handling nonlocal gotos. */
5505 nonlocal_goto_handler_slots
= 0;
5506 nonlocal_goto_stack_level
= 0;
5508 /* No labels have been declared for nonlocal use. */
5509 nonlocal_labels
= 0;
5511 /* No function calls so far in this function. */
5512 function_call_count
= 0;
5514 /* No parm regs have been allocated.
5515 (This is important for output_inline_function.) */
5516 max_parm_reg
= LAST_VIRTUAL_REGISTER
+ 1;
5518 /* Initialize the RTL mechanism. */
5521 /* Initialize the queue of pending postincrement and postdecrements,
5522 and some other info in expr.c. */
5525 /* We haven't done register allocation yet. */
5528 init_const_rtx_hash_table ();
5530 current_function_name
= (*decl_printable_name
) (subr
, 2);
5532 /* Nonzero if this is a nested function that uses a static chain. */
5534 current_function_needs_context
5535 = (decl_function_context (current_function_decl
) != 0
5536 && ! DECL_NO_STATIC_CHAIN (current_function_decl
));
5538 /* Set if a call to setjmp is seen. */
5539 current_function_calls_setjmp
= 0;
5541 /* Set if a call to longjmp is seen. */
5542 current_function_calls_longjmp
= 0;
5544 current_function_calls_alloca
= 0;
5545 current_function_has_nonlocal_label
= 0;
5546 current_function_has_nonlocal_goto
= 0;
5547 current_function_contains_functions
= 0;
5548 current_function_sp_is_unchanging
= 0;
5549 current_function_is_thunk
= 0;
5551 current_function_returns_pcc_struct
= 0;
5552 current_function_returns_struct
= 0;
5553 current_function_epilogue_delay_list
= 0;
5554 current_function_uses_const_pool
= 0;
5555 current_function_uses_pic_offset_table
= 0;
5556 current_function_cannot_inline
= 0;
5558 /* We have not yet needed to make a label to jump to for tail-recursion. */
5559 tail_recursion_label
= 0;
5561 /* We haven't had a need to make a save area for ap yet. */
5563 arg_pointer_save_area
= 0;
5565 /* No stack slots allocated yet. */
5568 /* No SAVE_EXPRs in this function yet. */
5571 /* No RTL_EXPRs in this function yet. */
5574 /* Set up to allocate temporaries. */
5577 /* Within function body, compute a type's size as soon it is laid out. */
5578 immediate_size_expand
++;
5580 /* We haven't made any trampolines for this function yet. */
5581 trampoline_list
= 0;
5583 init_pending_stack_adjust ();
5584 inhibit_defer_pop
= 0;
5586 current_function_outgoing_args_size
= 0;
5588 /* Prevent ever trying to delete the first instruction of a function.
5589 Also tell final how to output a linenum before the function prologue.
5590 Note linenums could be missing, e.g. when compiling a Java .class file. */
5592 emit_line_note (filename
, line
);
5594 /* Make sure first insn is a note even if we don't want linenums.
5595 This makes sure the first insn will never be deleted.
5596 Also, final expects a note to appear there. */
5597 emit_note (NULL_PTR
, NOTE_INSN_DELETED
);
5599 /* Set flags used by final.c. */
5600 if (aggregate_value_p (DECL_RESULT (subr
)))
5602 #ifdef PCC_STATIC_STRUCT_RETURN
5603 current_function_returns_pcc_struct
= 1;
5605 current_function_returns_struct
= 1;
5608 /* Warn if this value is an aggregate type,
5609 regardless of which calling convention we are using for it. */
5610 if (warn_aggregate_return
5611 && AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr
))))
5612 warning ("function returns an aggregate");
5614 current_function_returns_pointer
5615 = POINTER_TYPE_P (TREE_TYPE (DECL_RESULT (subr
)));
5617 /* Indicate that we need to distinguish between the return value of the
5618 present function and the return value of a function being called. */
5619 rtx_equal_function_value_matters
= 1;
5621 /* Indicate that we have not instantiated virtual registers yet. */
5622 virtuals_instantiated
= 0;
5624 /* Indicate we have no need of a frame pointer yet. */
5625 frame_pointer_needed
= 0;
5627 /* By default assume not varargs or stdarg. */
5628 current_function_varargs
= 0;
5629 current_function_stdarg
= 0;
5632 /* Indicate that the current function uses extra args
5633 not explicitly mentioned in the argument list in any fashion. */
5638 current_function_varargs
= 1;
5641 /* Expand a call to __main at the beginning of a possible main function. */
5643 #if defined(INIT_SECTION_ASM_OP) && !defined(INVOKE__main)
5644 #undef HAS_INIT_SECTION
5645 #define HAS_INIT_SECTION
5649 expand_main_function ()
5651 #if !defined (HAS_INIT_SECTION)
5652 emit_library_call (gen_rtx_SYMBOL_REF (Pmode
, NAME__MAIN
), 0,
5654 #endif /* not HAS_INIT_SECTION */
5657 extern struct obstack permanent_obstack
;
5659 /* Start the RTL for a new function, and set variables used for
5661 SUBR is the FUNCTION_DECL node.
5662 PARMS_HAVE_CLEANUPS is nonzero if there are cleanups associated with
5663 the function's parameters, which must be run at any return statement. */
5666 expand_function_start (subr
, parms_have_cleanups
)
5668 int parms_have_cleanups
;
5672 rtx last_ptr
= NULL_RTX
;
5674 /* Make sure volatile mem refs aren't considered
5675 valid operands of arithmetic insns. */
5676 init_recog_no_volatile ();
5678 /* Set this before generating any memory accesses. */
5679 current_function_check_memory_usage
5680 = (flag_check_memory_usage
5681 && ! DECL_NO_CHECK_MEMORY_USAGE (current_function_decl
));
5683 current_function_instrument_entry_exit
5684 = (flag_instrument_function_entry_exit
5685 && ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (subr
));
5687 /* If function gets a static chain arg, store it in the stack frame.
5688 Do this first, so it gets the first stack slot offset. */
5689 if (current_function_needs_context
)
5691 last_ptr
= assign_stack_local (Pmode
, GET_MODE_SIZE (Pmode
), 0);
5693 /* Delay copying static chain if it is not a register to avoid
5694 conflicts with regs used for parameters. */
5695 if (! SMALL_REGISTER_CLASSES
5696 || GET_CODE (static_chain_incoming_rtx
) == REG
)
5697 emit_move_insn (last_ptr
, static_chain_incoming_rtx
);
5700 /* If the parameters of this function need cleaning up, get a label
5701 for the beginning of the code which executes those cleanups. This must
5702 be done before doing anything with return_label. */
5703 if (parms_have_cleanups
)
5704 cleanup_label
= gen_label_rtx ();
5708 /* Make the label for return statements to jump to, if this machine
5709 does not have a one-instruction return and uses an epilogue,
5710 or if it returns a structure, or if it has parm cleanups. */
5712 if (cleanup_label
== 0 && HAVE_return
5713 && ! current_function_instrument_entry_exit
5714 && ! current_function_returns_pcc_struct
5715 && ! (current_function_returns_struct
&& ! optimize
))
5718 return_label
= gen_label_rtx ();
5720 return_label
= gen_label_rtx ();
5723 /* Initialize rtx used to return the value. */
5724 /* Do this before assign_parms so that we copy the struct value address
5725 before any library calls that assign parms might generate. */
5727 /* Decide whether to return the value in memory or in a register. */
5728 if (aggregate_value_p (DECL_RESULT (subr
)))
5730 /* Returning something that won't go in a register. */
5731 register rtx value_address
= 0;
5733 #ifdef PCC_STATIC_STRUCT_RETURN
5734 if (current_function_returns_pcc_struct
)
5736 int size
= int_size_in_bytes (TREE_TYPE (DECL_RESULT (subr
)));
5737 value_address
= assemble_static_space (size
);
5742 /* Expect to be passed the address of a place to store the value.
5743 If it is passed as an argument, assign_parms will take care of
5745 if (struct_value_incoming_rtx
)
5747 value_address
= gen_reg_rtx (Pmode
);
5748 emit_move_insn (value_address
, struct_value_incoming_rtx
);
5753 DECL_RTL (DECL_RESULT (subr
))
5754 = gen_rtx_MEM (DECL_MODE (DECL_RESULT (subr
)), value_address
);
5755 MEM_SET_IN_STRUCT_P (DECL_RTL (DECL_RESULT (subr
)),
5756 AGGREGATE_TYPE_P (TREE_TYPE
5761 else if (DECL_MODE (DECL_RESULT (subr
)) == VOIDmode
)
5762 /* If return mode is void, this decl rtl should not be used. */
5763 DECL_RTL (DECL_RESULT (subr
)) = 0;
5764 else if (parms_have_cleanups
|| current_function_instrument_entry_exit
)
5766 /* If function will end with cleanup code for parms,
5767 compute the return values into a pseudo reg,
5768 which we will copy into the true return register
5769 after the cleanups are done. */
5771 enum machine_mode mode
= DECL_MODE (DECL_RESULT (subr
));
5773 #ifdef PROMOTE_FUNCTION_RETURN
5774 tree type
= TREE_TYPE (DECL_RESULT (subr
));
5775 int unsignedp
= TREE_UNSIGNED (type
);
5777 mode
= promote_mode (type
, mode
, &unsignedp
, 1);
5780 DECL_RTL (DECL_RESULT (subr
)) = gen_reg_rtx (mode
);
5783 /* Scalar, returned in a register. */
5785 #ifdef FUNCTION_OUTGOING_VALUE
5786 DECL_RTL (DECL_RESULT (subr
))
5787 = FUNCTION_OUTGOING_VALUE (TREE_TYPE (DECL_RESULT (subr
)), subr
);
5789 DECL_RTL (DECL_RESULT (subr
))
5790 = FUNCTION_VALUE (TREE_TYPE (DECL_RESULT (subr
)), subr
);
5793 /* Mark this reg as the function's return value. */
5794 if (GET_CODE (DECL_RTL (DECL_RESULT (subr
))) == REG
)
5796 REG_FUNCTION_VALUE_P (DECL_RTL (DECL_RESULT (subr
))) = 1;
5797 /* Needed because we may need to move this to memory
5798 in case it's a named return value whose address is taken. */
5799 DECL_REGISTER (DECL_RESULT (subr
)) = 1;
5803 /* Initialize rtx for parameters and local variables.
5804 In some cases this requires emitting insns. */
5806 assign_parms (subr
, 0);
5808 /* Copy the static chain now if it wasn't a register. The delay is to
5809 avoid conflicts with the parameter passing registers. */
5811 if (SMALL_REGISTER_CLASSES
&& current_function_needs_context
)
5812 if (GET_CODE (static_chain_incoming_rtx
) != REG
)
5813 emit_move_insn (last_ptr
, static_chain_incoming_rtx
);
5815 /* The following was moved from init_function_start.
5816 The move is supposed to make sdb output more accurate. */
5817 /* Indicate the beginning of the function body,
5818 as opposed to parm setup. */
5819 emit_note (NULL_PTR
, NOTE_INSN_FUNCTION_BEG
);
5821 /* If doing stupid allocation, mark parms as born here. */
5823 if (GET_CODE (get_last_insn ()) != NOTE
)
5824 emit_note (NULL_PTR
, NOTE_INSN_DELETED
);
5825 parm_birth_insn
= get_last_insn ();
5829 for (i
= LAST_VIRTUAL_REGISTER
+ 1; i
< max_parm_reg
; i
++)
5830 use_variable (regno_reg_rtx
[i
]);
5832 if (current_function_internal_arg_pointer
!= virtual_incoming_args_rtx
)
5833 use_variable (current_function_internal_arg_pointer
);
5836 context_display
= 0;
5837 if (current_function_needs_context
)
5839 /* Fetch static chain values for containing functions. */
5840 tem
= decl_function_context (current_function_decl
);
5841 /* If not doing stupid register allocation copy the static chain
5842 pointer into a pseudo. If we have small register classes, copy
5843 the value from memory if static_chain_incoming_rtx is a REG. If
5844 we do stupid register allocation, we use the stack address
5846 if (tem
&& ! obey_regdecls
)
5848 /* If the static chain originally came in a register, put it back
5849 there, then move it out in the next insn. The reason for
5850 this peculiar code is to satisfy function integration. */
5851 if (SMALL_REGISTER_CLASSES
5852 && GET_CODE (static_chain_incoming_rtx
) == REG
)
5853 emit_move_insn (static_chain_incoming_rtx
, last_ptr
);
5854 last_ptr
= copy_to_reg (static_chain_incoming_rtx
);
5859 tree rtlexp
= make_node (RTL_EXPR
);
5861 RTL_EXPR_RTL (rtlexp
) = last_ptr
;
5862 context_display
= tree_cons (tem
, rtlexp
, context_display
);
5863 tem
= decl_function_context (tem
);
5866 /* Chain thru stack frames, assuming pointer to next lexical frame
5867 is found at the place we always store it. */
5868 #ifdef FRAME_GROWS_DOWNWARD
5869 last_ptr
= plus_constant (last_ptr
, - GET_MODE_SIZE (Pmode
));
5871 last_ptr
= copy_to_reg (gen_rtx_MEM (Pmode
,
5872 memory_address (Pmode
, last_ptr
)));
5874 /* If we are not optimizing, ensure that we know that this
5875 piece of context is live over the entire function. */
5877 save_expr_regs
= gen_rtx_EXPR_LIST (VOIDmode
, last_ptr
,
5882 if (current_function_instrument_entry_exit
)
5884 rtx fun
= DECL_RTL (current_function_decl
);
5885 if (GET_CODE (fun
) == MEM
)
5886 fun
= XEXP (fun
, 0);
5889 emit_library_call (profile_function_entry_libfunc
, 0, VOIDmode
, 2,
5891 expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS
,
5893 hard_frame_pointer_rtx
),
5897 /* After the display initializations is where the tail-recursion label
5898 should go, if we end up needing one. Ensure we have a NOTE here
5899 since some things (like trampolines) get placed before this. */
5900 tail_recursion_reentry
= emit_note (NULL_PTR
, NOTE_INSN_DELETED
);
5902 /* Evaluate now the sizes of any types declared among the arguments. */
5903 for (tem
= nreverse (get_pending_sizes ()); tem
; tem
= TREE_CHAIN (tem
))
5905 expand_expr (TREE_VALUE (tem
), const0_rtx
, VOIDmode
,
5906 EXPAND_MEMORY_USE_BAD
);
5907 /* Flush the queue in case this parameter declaration has
5912 /* Make sure there is a line number after the function entry setup code. */
5913 force_next_line_note ();
5916 /* Generate RTL for the end of the current function.
5917 FILENAME and LINE are the current position in the source file.
5919 It is up to language-specific callers to do cleanups for parameters--
5920 or else, supply 1 for END_BINDINGS and we will call expand_end_bindings. */
5923 expand_function_end (filename
, line
, end_bindings
)
5931 #ifdef TRAMPOLINE_TEMPLATE
5932 static rtx initial_trampoline
;
5935 #ifdef NON_SAVING_SETJMP
5936 /* Don't put any variables in registers if we call setjmp
5937 on a machine that fails to restore the registers. */
5938 if (NON_SAVING_SETJMP
&& current_function_calls_setjmp
)
5940 if (DECL_INITIAL (current_function_decl
) != error_mark_node
)
5941 setjmp_protect (DECL_INITIAL (current_function_decl
));
5943 setjmp_protect_args ();
5947 /* Save the argument pointer if a save area was made for it. */
5948 if (arg_pointer_save_area
)
5950 rtx x
= gen_move_insn (arg_pointer_save_area
, virtual_incoming_args_rtx
);
5951 emit_insn_before (x
, tail_recursion_reentry
);
5954 /* Initialize any trampolines required by this function. */
5955 for (link
= trampoline_list
; link
; link
= TREE_CHAIN (link
))
5957 tree function
= TREE_PURPOSE (link
);
5958 rtx context
= lookup_static_chain (function
);
5959 rtx tramp
= RTL_EXPR_RTL (TREE_VALUE (link
));
5960 #ifdef TRAMPOLINE_TEMPLATE
5965 #ifdef TRAMPOLINE_TEMPLATE
5966 /* First make sure this compilation has a template for
5967 initializing trampolines. */
5968 if (initial_trampoline
== 0)
5970 end_temporary_allocation ();
5972 = gen_rtx_MEM (BLKmode
, assemble_trampoline_template ());
5973 resume_temporary_allocation ();
5977 /* Generate insns to initialize the trampoline. */
5979 tramp
= round_trampoline_addr (XEXP (tramp
, 0));
5980 #ifdef TRAMPOLINE_TEMPLATE
5981 blktramp
= change_address (initial_trampoline
, BLKmode
, tramp
);
5982 emit_block_move (blktramp
, initial_trampoline
,
5983 GEN_INT (TRAMPOLINE_SIZE
),
5984 TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
5986 INITIALIZE_TRAMPOLINE (tramp
, XEXP (DECL_RTL (function
), 0), context
);
5990 /* Put those insns at entry to the containing function (this one). */
5991 emit_insns_before (seq
, tail_recursion_reentry
);
5994 /* If we are doing stack checking and this function makes calls,
5995 do a stack probe at the start of the function to ensure we have enough
5996 space for another stack frame. */
5997 if (flag_stack_check
&& ! STACK_CHECK_BUILTIN
)
6001 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
6002 if (GET_CODE (insn
) == CALL_INSN
)
6005 probe_stack_range (STACK_CHECK_PROTECT
,
6006 GEN_INT (STACK_CHECK_MAX_FRAME_SIZE
));
6009 emit_insns_before (seq
, tail_recursion_reentry
);
6014 /* Warn about unused parms if extra warnings were specified. */
6015 if (warn_unused
&& extra_warnings
)
6019 for (decl
= DECL_ARGUMENTS (current_function_decl
);
6020 decl
; decl
= TREE_CHAIN (decl
))
6021 if (! TREE_USED (decl
) && TREE_CODE (decl
) == PARM_DECL
6022 && DECL_NAME (decl
) && ! DECL_ARTIFICIAL (decl
))
6023 warning_with_decl (decl
, "unused parameter `%s'");
6026 /* Delete handlers for nonlocal gotos if nothing uses them. */
6027 if (nonlocal_goto_handler_slots
!= 0
6028 && ! current_function_has_nonlocal_label
)
6031 /* End any sequences that failed to be closed due to syntax errors. */
6032 while (in_sequence_p ())
6035 /* Outside function body, can't compute type's actual size
6036 until next function's body starts. */
6037 immediate_size_expand
--;
6039 /* If doing stupid register allocation,
6040 mark register parms as dying here. */
6045 for (i
= LAST_VIRTUAL_REGISTER
+ 1; i
< max_parm_reg
; i
++)
6046 use_variable (regno_reg_rtx
[i
]);
6048 /* Likewise for the regs of all the SAVE_EXPRs in the function. */
6050 for (tem
= save_expr_regs
; tem
; tem
= XEXP (tem
, 1))
6052 use_variable (XEXP (tem
, 0));
6053 use_variable_after (XEXP (tem
, 0), parm_birth_insn
);
6056 if (current_function_internal_arg_pointer
!= virtual_incoming_args_rtx
)
6057 use_variable (current_function_internal_arg_pointer
);
6060 clear_pending_stack_adjust ();
6061 do_pending_stack_adjust ();
6063 /* Mark the end of the function body.
6064 If control reaches this insn, the function can drop through
6065 without returning a value. */
6066 emit_note (NULL_PTR
, NOTE_INSN_FUNCTION_END
);
6068 /* Must mark the last line number note in the function, so that the test
6069 coverage code can avoid counting the last line twice. This just tells
6070 the code to ignore the immediately following line note, since there
6071 already exists a copy of this note somewhere above. This line number
6072 note is still needed for debugging though, so we can't delete it. */
6073 if (flag_test_coverage
)
6074 emit_note (NULL_PTR
, NOTE_REPEATED_LINE_NUMBER
);
6076 /* Output a linenumber for the end of the function.
6077 SDB depends on this. */
6078 emit_line_note_force (filename
, line
);
6080 /* Output the label for the actual return from the function,
6081 if one is expected. This happens either because a function epilogue
6082 is used instead of a return instruction, or because a return was done
6083 with a goto in order to run local cleanups, or because of pcc-style
6084 structure returning. */
6087 emit_label (return_label
);
6089 /* C++ uses this. */
6091 expand_end_bindings (0, 0, 0);
6093 /* Now handle any leftover exception regions that may have been
6094 created for the parameters. */
6096 rtx last
= get_last_insn ();
6099 expand_leftover_cleanups ();
6101 /* If the above emitted any code, may sure we jump around it. */
6102 if (last
!= get_last_insn ())
6104 label
= gen_label_rtx ();
6105 last
= emit_jump_insn_after (gen_jump (label
), last
);
6106 last
= emit_barrier_after (last
);
6111 if (current_function_instrument_entry_exit
)
6113 rtx fun
= DECL_RTL (current_function_decl
);
6114 if (GET_CODE (fun
) == MEM
)
6115 fun
= XEXP (fun
, 0);
6118 emit_library_call (profile_function_exit_libfunc
, 0, VOIDmode
, 2,
6120 expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS
,
6122 hard_frame_pointer_rtx
),
6126 /* If we had calls to alloca, and this machine needs
6127 an accurate stack pointer to exit the function,
6128 insert some code to save and restore the stack pointer. */
6129 #ifdef EXIT_IGNORE_STACK
6130 if (! EXIT_IGNORE_STACK
)
6132 if (current_function_calls_alloca
)
6136 emit_stack_save (SAVE_FUNCTION
, &tem
, parm_birth_insn
);
6137 emit_stack_restore (SAVE_FUNCTION
, tem
, NULL_RTX
);
6140 /* If scalar return value was computed in a pseudo-reg,
6141 copy that to the hard return register. */
6142 if (DECL_RTL (DECL_RESULT (current_function_decl
)) != 0
6143 && GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl
))) == REG
6144 && (REGNO (DECL_RTL (DECL_RESULT (current_function_decl
)))
6145 >= FIRST_PSEUDO_REGISTER
))
6147 rtx real_decl_result
;
6149 #ifdef FUNCTION_OUTGOING_VALUE
6151 = FUNCTION_OUTGOING_VALUE (TREE_TYPE (DECL_RESULT (current_function_decl
)),
6152 current_function_decl
);
6155 = FUNCTION_VALUE (TREE_TYPE (DECL_RESULT (current_function_decl
)),
6156 current_function_decl
);
6158 REG_FUNCTION_VALUE_P (real_decl_result
) = 1;
6159 /* If this is a BLKmode structure being returned in registers, then use
6160 the mode computed in expand_return. */
6161 if (GET_MODE (real_decl_result
) == BLKmode
)
6162 PUT_MODE (real_decl_result
,
6163 GET_MODE (DECL_RTL (DECL_RESULT (current_function_decl
))));
6164 emit_move_insn (real_decl_result
,
6165 DECL_RTL (DECL_RESULT (current_function_decl
)));
6166 emit_insn (gen_rtx_USE (VOIDmode
, real_decl_result
));
6168 /* The delay slot scheduler assumes that current_function_return_rtx
6169 holds the hard register containing the return value, not a temporary
6171 current_function_return_rtx
= real_decl_result
;
6174 /* If returning a structure, arrange to return the address of the value
6175 in a place where debuggers expect to find it.
6177 If returning a structure PCC style,
6178 the caller also depends on this value.
6179 And current_function_returns_pcc_struct is not necessarily set. */
6180 if (current_function_returns_struct
6181 || current_function_returns_pcc_struct
)
6183 rtx value_address
= XEXP (DECL_RTL (DECL_RESULT (current_function_decl
)), 0);
6184 tree type
= TREE_TYPE (DECL_RESULT (current_function_decl
));
6185 #ifdef FUNCTION_OUTGOING_VALUE
6187 = FUNCTION_OUTGOING_VALUE (build_pointer_type (type
),
6188 current_function_decl
);
6191 = FUNCTION_VALUE (build_pointer_type (type
),
6192 current_function_decl
);
6195 /* Mark this as a function return value so integrate will delete the
6196 assignment and USE below when inlining this function. */
6197 REG_FUNCTION_VALUE_P (outgoing
) = 1;
6199 emit_move_insn (outgoing
, value_address
);
6200 use_variable (outgoing
);
6203 /* If this is an implementation of __throw, do what's necessary to
6204 communicate between __builtin_eh_return and the epilogue. */
6205 expand_eh_return ();
6207 /* Output a return insn if we are using one.
6208 Otherwise, let the rtl chain end here, to drop through
6209 into the epilogue. */
6214 emit_jump_insn (gen_return ());
6219 /* Fix up any gotos that jumped out to the outermost
6220 binding level of the function.
6221 Must follow emitting RETURN_LABEL. */
6223 /* If you have any cleanups to do at this point,
6224 and they need to create temporary variables,
6225 then you will lose. */
6226 expand_fixups (get_insns ());
6229 /* These arrays record the INSN_UIDs of the prologue and epilogue insns. */
6231 static int *prologue
;
6232 static int *epilogue
;
6234 /* Create an array that records the INSN_UIDs of INSNS (either a sequence
6235 or a single insn). */
6237 #if defined (HAVE_prologue) || defined (HAVE_epilogue)
6239 record_insns (insns
)
6244 if (GET_CODE (insns
) == SEQUENCE
)
6246 int len
= XVECLEN (insns
, 0);
6247 vec
= (int *) oballoc ((len
+ 1) * sizeof (int));
6250 vec
[len
] = INSN_UID (XVECEXP (insns
, 0, len
));
6254 vec
= (int *) oballoc (2 * sizeof (int));
6255 vec
[0] = INSN_UID (insns
);
6261 /* Determine how many INSN_UIDs in VEC are part of INSN. */
6264 contains (insn
, vec
)
6270 if (GET_CODE (insn
) == INSN
6271 && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
6274 for (i
= XVECLEN (PATTERN (insn
), 0) - 1; i
>= 0; i
--)
6275 for (j
= 0; vec
[j
]; j
++)
6276 if (INSN_UID (XVECEXP (PATTERN (insn
), 0, i
)) == vec
[j
])
6282 for (j
= 0; vec
[j
]; j
++)
6283 if (INSN_UID (insn
) == vec
[j
])
6288 #endif /* HAVE_prologue || HAVE_epilogue */
6290 /* Generate the prologue and epilogue RTL if the machine supports it. Thread
6291 this into place with notes indicating where the prologue ends and where
6292 the epilogue begins. Update the basic block information when possible. */
6295 thread_prologue_and_epilogue_insns (f
)
6296 rtx f ATTRIBUTE_UNUSED
;
6298 #ifdef HAVE_prologue
6303 /* The first insn (a NOTE_INSN_DELETED) is followed by zero or more
6304 prologue insns and a NOTE_INSN_PROLOGUE_END. */
6305 emit_note_after (NOTE_INSN_PROLOGUE_END
, f
);
6306 seq
= gen_prologue ();
6307 head
= emit_insn_after (seq
, f
);
6309 /* Include the new prologue insns in the first block. Ignore them
6310 if they form a basic block unto themselves. */
6311 if (x_basic_block_head
&& n_basic_blocks
6312 && GET_CODE (BLOCK_HEAD (0)) != CODE_LABEL
)
6313 BLOCK_HEAD (0) = NEXT_INSN (f
);
6315 /* Retain a map of the prologue insns. */
6316 prologue
= record_insns (GET_CODE (seq
) == SEQUENCE
? seq
: head
);
6322 #ifdef HAVE_epilogue
6325 rtx insn
= get_last_insn ();
6326 rtx prev
= prev_nonnote_insn (insn
);
6328 /* If we end with a BARRIER, we don't need an epilogue. */
6329 if (! (prev
&& GET_CODE (prev
) == BARRIER
))
6335 /* The last basic block ends with a NOTE_INSN_EPILOGUE_BEG, the
6336 epilogue insns, the USE insns at the end of a function,
6337 the jump insn that returns, and then a BARRIER. */
6339 /* Move the USE insns at the end of a function onto a list. */
6341 && GET_CODE (prev
) == INSN
6342 && GET_CODE (PATTERN (prev
)) == USE
)
6345 prev
= prev_nonnote_insn (prev
);
6347 NEXT_INSN (PREV_INSN (tem
)) = NEXT_INSN (tem
);
6348 PREV_INSN (NEXT_INSN (tem
)) = PREV_INSN (tem
);
6351 NEXT_INSN (tem
) = first_use
;
6352 PREV_INSN (first_use
) = tem
;
6359 emit_barrier_after (insn
);
6361 seq
= gen_epilogue ();
6362 tail
= emit_jump_insn_after (seq
, insn
);
6364 /* Insert the USE insns immediately before the return insn, which
6365 must be the first instruction before the final barrier. */
6368 tem
= prev_nonnote_insn (get_last_insn ());
6369 NEXT_INSN (PREV_INSN (tem
)) = first_use
;
6370 PREV_INSN (first_use
) = PREV_INSN (tem
);
6371 PREV_INSN (tem
) = last_use
;
6372 NEXT_INSN (last_use
) = tem
;
6375 emit_note_after (NOTE_INSN_EPILOGUE_BEG
, insn
);
6377 /* Include the new epilogue insns in the last block. Ignore
6378 them if they form a basic block unto themselves. */
6379 if (x_basic_block_end
&& n_basic_blocks
6380 && GET_CODE (BLOCK_END (n_basic_blocks
- 1)) != JUMP_INSN
)
6381 BLOCK_END (n_basic_blocks
- 1) = tail
;
6383 /* Retain a map of the epilogue insns. */
6384 epilogue
= record_insns (GET_CODE (seq
) == SEQUENCE
? seq
: tail
);
6392 /* Reposition the prologue-end and epilogue-begin notes after instruction
6393 scheduling and delayed branch scheduling. */
6396 reposition_prologue_and_epilogue_notes (f
)
6397 rtx f ATTRIBUTE_UNUSED
;
6399 #if defined (HAVE_prologue) || defined (HAVE_epilogue)
6400 /* Reposition the prologue and epilogue notes. */
6408 register rtx insn
, note
= 0;
6410 /* Scan from the beginning until we reach the last prologue insn.
6411 We apparently can't depend on basic_block_{head,end} after
6413 for (len
= 0; prologue
[len
]; len
++)
6415 for (insn
= f
; len
&& insn
; insn
= NEXT_INSN (insn
))
6417 if (GET_CODE (insn
) == NOTE
)
6419 if (NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PROLOGUE_END
)
6422 else if ((len
-= contains (insn
, prologue
)) == 0)
6424 /* Find the prologue-end note if we haven't already, and
6425 move it to just after the last prologue insn. */
6428 for (note
= insn
; (note
= NEXT_INSN (note
));)
6429 if (GET_CODE (note
) == NOTE
6430 && NOTE_LINE_NUMBER (note
) == NOTE_INSN_PROLOGUE_END
)
6434 next
= NEXT_INSN (note
);
6435 prev
= PREV_INSN (note
);
6437 NEXT_INSN (prev
) = next
;
6439 PREV_INSN (next
) = prev
;
6441 /* Whether or not we can depend on BLOCK_HEAD,
6442 attempt to keep it up-to-date. */
6443 if (BLOCK_HEAD (0) == note
)
6444 BLOCK_HEAD (0) = next
;
6446 add_insn_after (note
, insn
);
6453 register rtx insn
, note
= 0;
6455 /* Scan from the end until we reach the first epilogue insn.
6456 We apparently can't depend on basic_block_{head,end} after
6458 for (len
= 0; epilogue
[len
]; len
++)
6460 for (insn
= get_last_insn (); len
&& insn
; insn
= PREV_INSN (insn
))
6462 if (GET_CODE (insn
) == NOTE
)
6464 if (NOTE_LINE_NUMBER (insn
) == NOTE_INSN_EPILOGUE_BEG
)
6467 else if ((len
-= contains (insn
, epilogue
)) == 0)
6469 /* Find the epilogue-begin note if we haven't already, and
6470 move it to just before the first epilogue insn. */
6473 for (note
= insn
; (note
= PREV_INSN (note
));)
6474 if (GET_CODE (note
) == NOTE
6475 && NOTE_LINE_NUMBER (note
) == NOTE_INSN_EPILOGUE_BEG
)
6478 next
= NEXT_INSN (note
);
6479 prev
= PREV_INSN (note
);
6481 NEXT_INSN (prev
) = next
;
6483 PREV_INSN (next
) = prev
;
6485 /* Whether or not we can depend on BLOCK_HEAD,
6486 attempt to keep it up-to-date. */
6488 && BLOCK_HEAD (n_basic_blocks
-1) == insn
)
6489 BLOCK_HEAD (n_basic_blocks
-1) = note
;
6491 add_insn_before (note
, insn
);
6496 #endif /* HAVE_prologue or HAVE_epilogue */