1 /* This file contains the definitions and documentation for the
2 Register Transfer Expressions (rtx's) that make up the
3 Register Transfer Language (rtl) used in the Back End of the GNU compiler.
4 Copyright (C) 1987, 1988, 1992, 1994, 1995, 1997, 1998, 1999, 2000, 2004,
6 Free Software Foundation, Inc.
8 This file is part of GCC.
10 GCC is free software; you can redistribute it and/or modify it under
11 the terms of the GNU General Public License as published by the Free
12 Software Foundation; either version 2, or (at your option) any later
15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 You should have received a copy of the GNU General Public License
21 along with GCC; see the file COPYING. If not, write to the Free
22 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
26 /* Expression definitions and descriptions for all targets are in this file.
27 Some will not be used for some targets.
29 The fields in the cpp macro call "DEF_RTL_EXPR()"
30 are used to create declarations in the C source of the compiler.
34 1. The internal name of the rtx used in the C source.
35 It is a tag in the enumeration "enum rtx_code" defined in "rtl.h".
36 By convention these are in UPPER_CASE.
38 2. The name of the rtx in the external ASCII format read by
39 read_rtx(), and printed by print_rtx().
40 These names are stored in rtx_name[].
41 By convention these are the internal (field 1) names in lower_case.
43 3. The print format, and type of each rtx->u.fld[] (field) in this rtx.
44 These formats are stored in rtx_format[].
45 The meaning of the formats is documented in front of this array in rtl.c
47 4. The class of the rtx. These are stored in rtx_class and are accessed
48 via the GET_RTX_CLASS macro. They are defined as follows:
51 an rtx code that can be used to represent a constant object
54 an rtx code that can be used to represent an object (e.g, REG, MEM)
56 an rtx code for a comparison (e.g, LT, GT)
58 an rtx code for a commutative comparison (e.g, EQ, NE, ORDERED)
60 an rtx code for a unary arithmetic expression (e.g, NEG, NOT)
62 an rtx code for a commutative binary operation (e.g,, PLUS, MULT)
64 an rtx code for a non-bitfield three input operation (IF_THEN_ELSE)
66 an rtx code for a non-commutative binary operation (e.g., MINUS, DIV)
68 an rtx code for a bit-field operation (ZERO_EXTRACT, SIGN_EXTRACT)
70 an rtx code for a machine insn (INSN, JUMP_INSN, CALL_INSN)
72 an rtx code for something that matches in insns (e.g, MATCH_DUP)
74 an rtx code for autoincrement addressing modes (e.g. POST_DEC)
78 All of the expressions that appear only in machine descriptions,
79 not in RTL used by the compiler itself, are at the end of the file. */
81 /* Unknown, or no such operation; the enumeration constant should have
83 DEF_RTL_EXPR(UNKNOWN, "UnKnown", "*", RTX_EXTRA)
85 /* ---------------------------------------------------------------------
86 Expressions used in constructing lists.
87 --------------------------------------------------------------------- */
89 /* a linked list of expressions */
90 DEF_RTL_EXPR(EXPR_LIST, "expr_list", "ee", RTX_EXTRA)
92 /* a linked list of instructions.
93 The insns are represented in print by their uids. */
94 DEF_RTL_EXPR(INSN_LIST, "insn_list", "ue", RTX_EXTRA)
96 /* SEQUENCE appears in the result of a `gen_...' function
97 for a DEFINE_EXPAND that wants to make several insns.
98 Its elements are the bodies of the insns that should be made.
99 `emit_insn' takes the SEQUENCE apart and makes separate insns. */
100 DEF_RTL_EXPR(SEQUENCE, "sequence", "E", RTX_EXTRA)
102 /* Refers to the address of its argument. This is only used in alias.c. */
103 DEF_RTL_EXPR(ADDRESS, "address", "e", RTX_MATCH)
105 /* ----------------------------------------------------------------------
106 Expression types used for things in the instruction chain.
108 All formats must start with "iuu" to handle the chain.
109 Each insn expression holds an rtl instruction and its semantics
110 during back-end processing.
111 See macros's in "rtl.h" for the meaning of each rtx->u.fld[].
113 ---------------------------------------------------------------------- */
115 /* An instruction that cannot jump. */
116 DEF_RTL_EXPR(INSN, "insn", "iuuBieie", RTX_INSN)
118 /* An instruction that can possibly jump.
119 Fields ( rtx->u.fld[] ) have exact same meaning as INSN's. */
120 DEF_RTL_EXPR(JUMP_INSN, "jump_insn", "iuuBieie0", RTX_INSN)
122 /* An instruction that can possibly call a subroutine
123 but which will not change which instruction comes next
124 in the current function.
125 Field ( rtx->u.fld[8] ) is CALL_INSN_FUNCTION_USAGE.
126 All other fields ( rtx->u.fld[] ) have exact same meaning as INSN's. */
127 DEF_RTL_EXPR(CALL_INSN, "call_insn", "iuuBieiee", RTX_INSN)
129 /* A marker that indicates that control will not flow through. */
130 DEF_RTL_EXPR(BARRIER, "barrier", "iuu00000", RTX_EXTRA)
132 /* Holds a label that is followed by instructions.
134 4: is used in jump.c for the use-count of the label.
135 5: is used in the sh backend.
136 6: is a number that is unique in the entire compilation.
137 7: is the user-given name of the label, if any. */
138 DEF_RTL_EXPR(CODE_LABEL, "code_label", "iuuB00is", RTX_EXTRA)
140 /* Say where in the code a source line starts, for symbol table's sake.
142 4: note-specific data
144 6: unique number if insn_note == note_insn_deleted_label. */
145 DEF_RTL_EXPR(NOTE, "note", "iuuB0ni", RTX_EXTRA)
147 /* ----------------------------------------------------------------------
148 Top level constituents of INSN, JUMP_INSN and CALL_INSN.
149 ---------------------------------------------------------------------- */
151 /* Conditionally execute code.
152 Operand 0 is the condition that if true, the code is executed.
153 Operand 1 is the code to be executed (typically a SET).
155 Semantics are that there are no side effects if the condition
156 is false. This pattern is created automatically by the if_convert
157 pass run after reload or by target-specific splitters. */
158 DEF_RTL_EXPR(COND_EXEC, "cond_exec", "ee", RTX_EXTRA)
160 /* Several operations to be done in parallel (perhaps under COND_EXEC). */
161 DEF_RTL_EXPR(PARALLEL, "parallel", "E", RTX_EXTRA)
163 #ifdef USE_MAPPED_LOCATION
164 /* A string that is passed through to the assembler as input.
165 One can obviously pass comments through by using the
166 assembler comment syntax.
167 These occur in an insn all by themselves as the PATTERN.
168 They also appear inside an ASM_OPERANDS
169 as a convenient way to hold a string. */
170 DEF_RTL_EXPR(ASM_INPUT, "asm_input", "si", RTX_EXTRA)
172 /* An assembler instruction with operands.
173 1st operand is the instruction template.
174 2nd operand is the constraint for the output.
175 3rd operand is the number of the output this expression refers to.
176 When an insn stores more than one value, a separate ASM_OPERANDS
177 is made for each output; this integer distinguishes them.
178 4th is a vector of values of input operands.
179 5th is a vector of modes and constraints for the input operands.
180 Each element is an ASM_INPUT containing a constraint string
181 and whose mode indicates the mode of the input operand.
182 6th is the source line number. */
183 DEF_RTL_EXPR(ASM_OPERANDS, "asm_operands", "ssiEEi", RTX_EXTRA)
185 /* A string that is passed through to the assembler as input.
186 One can obviously pass comments through by using the
187 assembler comment syntax.
188 These occur in an insn all by themselves as the PATTERN.
189 They also appear inside an ASM_OPERANDS
190 as a convenient way to hold a string. */
191 DEF_RTL_EXPR(ASM_INPUT, "asm_input", "ssi", RTX_EXTRA)
193 /* An assembler instruction with operands.
194 1st operand is the instruction template.
195 2nd operand is the constraint for the output.
196 3rd operand is the number of the output this expression refers to.
197 When an insn stores more than one value, a separate ASM_OPERANDS
198 is made for each output; this integer distinguishes them.
199 4th is a vector of values of input operands.
200 5th is a vector of modes and constraints for the input operands.
201 Each element is an ASM_INPUT containing a constraint string
202 and whose mode indicates the mode of the input operand.
203 6th is the name of the containing source file.
204 7th is the source line number. */
205 DEF_RTL_EXPR(ASM_OPERANDS, "asm_operands", "ssiEEsi", RTX_EXTRA)
208 /* A machine-specific operation.
209 1st operand is a vector of operands being used by the operation so that
210 any needed reloads can be done.
211 2nd operand is a unique value saying which of a number of machine-specific
212 operations is to be performed.
213 (Note that the vector must be the first operand because of the way that
214 genrecog.c record positions within an insn.)
216 UNSPEC can occur all by itself in a PATTERN, as a component of a PARALLEL,
217 or inside an expression.
218 UNSPEC by itself or as a component of a PARALLEL
219 is currently considered not deletable.
221 FIXME: Replace all uses of UNSPEC that appears by itself or as a component
222 of a PARALLEL with USE.
224 DEF_RTL_EXPR(UNSPEC, "unspec", "Ei", RTX_EXTRA)
226 /* Similar, but a volatile operation and one which may trap. */
227 DEF_RTL_EXPR(UNSPEC_VOLATILE, "unspec_volatile", "Ei", RTX_EXTRA)
229 /* Vector of addresses, stored as full words. */
230 /* Each element is a LABEL_REF to a CODE_LABEL whose address we want. */
231 DEF_RTL_EXPR(ADDR_VEC, "addr_vec", "E", RTX_EXTRA)
233 /* Vector of address differences X0 - BASE, X1 - BASE, ...
234 First operand is BASE; the vector contains the X's.
235 The machine mode of this rtx says how much space to leave
236 for each difference and is adjusted by branch shortening if
237 CASE_VECTOR_SHORTEN_MODE is defined.
238 The third and fourth operands store the target labels with the
239 minimum and maximum addresses respectively.
240 The fifth operand stores flags for use by branch shortening.
241 Set at the start of shorten_branches:
242 min_align: the minimum alignment for any of the target labels.
243 base_after_vec: true iff BASE is after the ADDR_DIFF_VEC.
244 min_after_vec: true iff minimum addr target label is after the ADDR_DIFF_VEC.
245 max_after_vec: true iff maximum addr target label is after the ADDR_DIFF_VEC.
246 min_after_base: true iff minimum address target label is after BASE.
247 max_after_base: true iff maximum address target label is after BASE.
248 Set by the actual branch shortening process:
249 offset_unsigned: true iff offsets have to be treated as unsigned.
250 scale: scaling that is necessary to make offsets fit into the mode.
252 The third, fourth and fifth operands are only valid when
253 CASE_VECTOR_SHORTEN_MODE is defined, and only in an optimizing
256 DEF_RTL_EXPR(ADDR_DIFF_VEC, "addr_diff_vec", "eEee0", RTX_EXTRA)
258 /* Memory prefetch, with attributes supported on some targets.
259 Operand 1 is the address of the memory to fetch.
260 Operand 2 is 1 for a write access, 0 otherwise.
261 Operand 3 is the level of temporal locality; 0 means there is no
262 temporal locality and 1, 2, and 3 are for increasing levels of temporal
265 The attributes specified by operands 2 and 3 are ignored for targets
266 whose prefetch instructions do not support them. */
267 DEF_RTL_EXPR(PREFETCH, "prefetch", "eee", RTX_EXTRA)
269 /* ----------------------------------------------------------------------
270 At the top level of an instruction (perhaps under PARALLEL).
271 ---------------------------------------------------------------------- */
274 Operand 1 is the location (REG, MEM, PC, CC0 or whatever) assigned to.
275 Operand 2 is the value stored there.
276 ALL assignment must use SET.
277 Instructions that do multiple assignments must use multiple SET,
279 DEF_RTL_EXPR(SET, "set", "ee", RTX_EXTRA)
281 /* Indicate something is used in a way that we don't want to explain.
282 For example, subroutine calls will use the register
283 in which the static chain is passed.
285 USE can not appear as an operand of other rtx except for PARALLEL.
286 USE is not deletable, as it indicates that the operand
287 is used in some unknown way. */
288 DEF_RTL_EXPR(USE, "use", "e", RTX_EXTRA)
290 /* Indicate something is clobbered in a way that we don't want to explain.
291 For example, subroutine calls will clobber some physical registers
292 (the ones that are by convention not saved).
294 CLOBBER can not appear as an operand of other rtx except for PARALLEL.
295 CLOBBER of a hard register appearing by itself (not within PARALLEL)
296 is considered undeletable before reload. */
297 DEF_RTL_EXPR(CLOBBER, "clobber", "e", RTX_EXTRA)
299 /* Call a subroutine.
300 Operand 1 is the address to call.
301 Operand 2 is the number of arguments. */
303 DEF_RTL_EXPR(CALL, "call", "ee", RTX_EXTRA)
305 /* Return from a subroutine. */
307 DEF_RTL_EXPR(RETURN, "return", "", RTX_EXTRA)
310 Operand 1 is the condition.
311 Operand 2 is the trap code.
312 For an unconditional trap, make the condition (const_int 1). */
313 DEF_RTL_EXPR(TRAP_IF, "trap_if", "ee", RTX_EXTRA)
315 /* Placeholder for _Unwind_Resume before we know if a function call
316 or a branch is needed. Operand 1 is the exception region from
317 which control is flowing. */
318 DEF_RTL_EXPR(RESX, "resx", "i", RTX_EXTRA)
320 /* ----------------------------------------------------------------------
321 Primitive values for use in expressions.
322 ---------------------------------------------------------------------- */
324 /* numeric integer constant */
325 DEF_RTL_EXPR(CONST_INT, "const_int", "w", RTX_CONST_OBJ)
327 /* numeric floating point constant.
328 Operands hold the value. They are all 'w' and there may be from 2 to 6;
330 DEF_RTL_EXPR(CONST_DOUBLE, "const_double", CONST_DOUBLE_FORMAT, RTX_CONST_OBJ)
332 /* Describes a vector constant. */
333 DEF_RTL_EXPR(CONST_VECTOR, "const_vector", "E", RTX_CONST_OBJ)
335 /* String constant. Used for attributes in machine descriptions and
336 for special cases in DWARF2 debug output. NOT used for source-
337 language string constants. */
338 DEF_RTL_EXPR(CONST_STRING, "const_string", "s", RTX_OBJ)
340 /* This is used to encapsulate an expression whose value is constant
341 (such as the sum of a SYMBOL_REF and a CONST_INT) so that it will be
342 recognized as a constant operand rather than by arithmetic instructions. */
344 DEF_RTL_EXPR(CONST, "const", "e", RTX_CONST_OBJ)
346 /* program counter. Ordinary jumps are represented
347 by a SET whose first operand is (PC). */
348 DEF_RTL_EXPR(PC, "pc", "", RTX_OBJ)
350 /* Used in the cselib routines to describe a value. Objects of this
351 kind are only allocated in cselib.c, in an alloc pool instead of
352 in GC memory. The only operand of a VALUE is a cselib_val_struct. */
353 DEF_RTL_EXPR(VALUE, "value", "0", RTX_OBJ)
355 /* A register. The "operand" is the register number, accessed with
356 the REGNO macro. If this number is less than FIRST_PSEUDO_REGISTER
357 than a hardware register is being referred to. The second operand
358 holds the original register number - this will be different for a
359 pseudo register that got turned into a hard register. The third
360 operand points to a reg_attrs structure.
361 This rtx needs to have as many (or more) fields as a MEM, since we
362 can change REG rtx's into MEMs during reload. */
363 DEF_RTL_EXPR(REG, "reg", "i00", RTX_OBJ)
365 /* A scratch register. This represents a register used only within a
366 single insn. It will be turned into a REG during register allocation
367 or reload unless the constraint indicates that the register won't be
368 needed, in which case it can remain a SCRATCH. This code is
369 marked as having one operand so it can be turned into a REG. */
370 DEF_RTL_EXPR(SCRATCH, "scratch", "0", RTX_OBJ)
372 /* One word of a multi-word value.
373 The first operand is the complete value; the second says which word.
374 The WORDS_BIG_ENDIAN flag controls whether word number 0
375 (as numbered in a SUBREG) is the most or least significant word.
377 This is also used to refer to a value in a different machine mode.
378 For example, it can be used to refer to a SImode value as if it were
379 Qimode, or vice versa. Then the word number is always 0. */
380 DEF_RTL_EXPR(SUBREG, "subreg", "ei", RTX_EXTRA)
382 /* This one-argument rtx is used for move instructions
383 that are guaranteed to alter only the low part of a destination.
384 Thus, (SET (SUBREG:HI (REG...)) (MEM:HI ...))
385 has an unspecified effect on the high part of REG,
386 but (SET (STRICT_LOW_PART (SUBREG:HI (REG...))) (MEM:HI ...))
387 is guaranteed to alter only the bits of REG that are in HImode.
389 The actual instruction used is probably the same in both cases,
390 but the register constraints may be tighter when STRICT_LOW_PART
393 DEF_RTL_EXPR(STRICT_LOW_PART, "strict_low_part", "e", RTX_EXTRA)
395 /* (CONCAT a b) represents the virtual concatenation of a and b
396 to make a value that has as many bits as a and b put together.
397 This is used for complex values. Normally it appears only
398 in DECL_RTLs and during RTL generation, but not in the insn chain. */
399 DEF_RTL_EXPR(CONCAT, "concat", "ee", RTX_OBJ)
401 /* (CONCATN [a1 a2 ... an]) represents the virtual concatenation of
402 all An to make a value. This is an extension of CONCAT to larger
403 number of components. Like CONCAT, it should not appear in the
404 insn chain. Every element of the CONCATN is the same size. */
405 DEF_RTL_EXPR(CONCATN, "concatn", "E", RTX_OBJ)
407 /* A memory location; operand is the address. The second operand is the
408 alias set to which this MEM belongs. We use `0' instead of `w' for this
409 field so that the field need not be specified in machine descriptions. */
410 DEF_RTL_EXPR(MEM, "mem", "e0", RTX_OBJ)
412 /* Reference to an assembler label in the code for this function.
413 The operand is a CODE_LABEL found in the insn chain. */
414 DEF_RTL_EXPR(LABEL_REF, "label_ref", "u", RTX_CONST_OBJ)
416 /* Reference to a named label:
417 Operand 0: label name
418 Operand 1: flags (see SYMBOL_FLAG_* in rtl.h)
419 Operand 2: tree from which this symbol is derived, or null.
420 This is either a DECL node, or some kind of constant. */
421 DEF_RTL_EXPR(SYMBOL_REF, "symbol_ref", "s00", RTX_CONST_OBJ)
423 /* The condition code register is represented, in our imagination,
424 as a register holding a value that can be compared to zero.
425 In fact, the machine has already compared them and recorded the
426 results; but instructions that look at the condition code
427 pretend to be looking at the entire value and comparing it. */
428 DEF_RTL_EXPR(CC0, "cc0", "", RTX_OBJ)
430 /* ----------------------------------------------------------------------
431 Expressions for operators in an rtl pattern
432 ---------------------------------------------------------------------- */
434 /* if_then_else. This is used in representing ordinary
435 conditional jump instructions.
440 DEF_RTL_EXPR(IF_THEN_ELSE, "if_then_else", "eee", RTX_TERNARY)
442 /* Comparison, produces a condition code result. */
443 DEF_RTL_EXPR(COMPARE, "compare", "ee", RTX_BIN_ARITH)
446 DEF_RTL_EXPR(PLUS, "plus", "ee", RTX_COMM_ARITH)
448 /* Operand 0 minus operand 1. */
449 DEF_RTL_EXPR(MINUS, "minus", "ee", RTX_BIN_ARITH)
451 /* Minus operand 0. */
452 DEF_RTL_EXPR(NEG, "neg", "e", RTX_UNARY)
454 DEF_RTL_EXPR(MULT, "mult", "ee", RTX_COMM_ARITH)
456 /* Operand 0 divided by operand 1. */
457 DEF_RTL_EXPR(DIV, "div", "ee", RTX_BIN_ARITH)
458 /* Remainder of operand 0 divided by operand 1. */
459 DEF_RTL_EXPR(MOD, "mod", "ee", RTX_BIN_ARITH)
461 /* Unsigned divide and remainder. */
462 DEF_RTL_EXPR(UDIV, "udiv", "ee", RTX_BIN_ARITH)
463 DEF_RTL_EXPR(UMOD, "umod", "ee", RTX_BIN_ARITH)
465 /* Bitwise operations. */
466 DEF_RTL_EXPR(AND, "and", "ee", RTX_COMM_ARITH)
467 DEF_RTL_EXPR(IOR, "ior", "ee", RTX_COMM_ARITH)
468 DEF_RTL_EXPR(XOR, "xor", "ee", RTX_COMM_ARITH)
469 DEF_RTL_EXPR(NOT, "not", "e", RTX_UNARY)
472 0: value to be shifted.
473 1: number of bits. */
474 DEF_RTL_EXPR(ASHIFT, "ashift", "ee", RTX_BIN_ARITH) /* shift left */
475 DEF_RTL_EXPR(ROTATE, "rotate", "ee", RTX_BIN_ARITH) /* rotate left */
476 DEF_RTL_EXPR(ASHIFTRT, "ashiftrt", "ee", RTX_BIN_ARITH) /* arithmetic shift right */
477 DEF_RTL_EXPR(LSHIFTRT, "lshiftrt", "ee", RTX_BIN_ARITH) /* logical shift right */
478 DEF_RTL_EXPR(ROTATERT, "rotatert", "ee", RTX_BIN_ARITH) /* rotate right */
480 /* Minimum and maximum values of two operands. We need both signed and
481 unsigned forms. (We cannot use MIN for SMIN because it conflicts
482 with a macro of the same name.) The signed variants should be used
483 with floating point. Further, if both operands are zeros, or if either
484 operand is NaN, then it is unspecified which of the two operands is
485 returned as the result. */
487 DEF_RTL_EXPR(SMIN, "smin", "ee", RTX_COMM_ARITH)
488 DEF_RTL_EXPR(SMAX, "smax", "ee", RTX_COMM_ARITH)
489 DEF_RTL_EXPR(UMIN, "umin", "ee", RTX_COMM_ARITH)
490 DEF_RTL_EXPR(UMAX, "umax", "ee", RTX_COMM_ARITH)
492 /* These unary operations are used to represent incrementation
493 and decrementation as they occur in memory addresses.
494 The amount of increment or decrement are not represented
495 because they can be understood from the machine-mode of the
496 containing MEM. These operations exist in only two cases:
497 1. pushes onto the stack.
498 2. created automatically by the life_analysis pass in flow.c. */
499 DEF_RTL_EXPR(PRE_DEC, "pre_dec", "e", RTX_AUTOINC)
500 DEF_RTL_EXPR(PRE_INC, "pre_inc", "e", RTX_AUTOINC)
501 DEF_RTL_EXPR(POST_DEC, "post_dec", "e", RTX_AUTOINC)
502 DEF_RTL_EXPR(POST_INC, "post_inc", "e", RTX_AUTOINC)
504 /* These binary operations are used to represent generic address
505 side-effects in memory addresses, except for simple incrementation
506 or decrementation which use the above operations. They are
507 created automatically by the life_analysis pass in flow.c.
508 The first operand is a REG which is used as the address.
509 The second operand is an expression that is assigned to the
510 register, either before (PRE_MODIFY) or after (POST_MODIFY)
511 evaluating the address.
512 Currently, the compiler can only handle second operands of the
513 form (plus (reg) (reg)) and (plus (reg) (const_int)), where
514 the first operand of the PLUS has to be the same register as
515 the first operand of the *_MODIFY. */
516 DEF_RTL_EXPR(PRE_MODIFY, "pre_modify", "ee", RTX_AUTOINC)
517 DEF_RTL_EXPR(POST_MODIFY, "post_modify", "ee", RTX_AUTOINC)
519 /* Comparison operations. The ordered comparisons exist in two
520 flavors, signed and unsigned. */
521 DEF_RTL_EXPR(NE, "ne", "ee", RTX_COMM_COMPARE)
522 DEF_RTL_EXPR(EQ, "eq", "ee", RTX_COMM_COMPARE)
523 DEF_RTL_EXPR(GE, "ge", "ee", RTX_COMPARE)
524 DEF_RTL_EXPR(GT, "gt", "ee", RTX_COMPARE)
525 DEF_RTL_EXPR(LE, "le", "ee", RTX_COMPARE)
526 DEF_RTL_EXPR(LT, "lt", "ee", RTX_COMPARE)
527 DEF_RTL_EXPR(GEU, "geu", "ee", RTX_COMPARE)
528 DEF_RTL_EXPR(GTU, "gtu", "ee", RTX_COMPARE)
529 DEF_RTL_EXPR(LEU, "leu", "ee", RTX_COMPARE)
530 DEF_RTL_EXPR(LTU, "ltu", "ee", RTX_COMPARE)
532 /* Additional floating point unordered comparison flavors. */
533 DEF_RTL_EXPR(UNORDERED, "unordered", "ee", RTX_COMM_COMPARE)
534 DEF_RTL_EXPR(ORDERED, "ordered", "ee", RTX_COMM_COMPARE)
536 /* These are equivalent to unordered or ... */
537 DEF_RTL_EXPR(UNEQ, "uneq", "ee", RTX_COMM_COMPARE)
538 DEF_RTL_EXPR(UNGE, "unge", "ee", RTX_COMPARE)
539 DEF_RTL_EXPR(UNGT, "ungt", "ee", RTX_COMPARE)
540 DEF_RTL_EXPR(UNLE, "unle", "ee", RTX_COMPARE)
541 DEF_RTL_EXPR(UNLT, "unlt", "ee", RTX_COMPARE)
543 /* This is an ordered NE, ie !UNEQ, ie false for NaN. */
544 DEF_RTL_EXPR(LTGT, "ltgt", "ee", RTX_COMM_COMPARE)
546 /* Represents the result of sign-extending the sole operand.
547 The machine modes of the operand and of the SIGN_EXTEND expression
548 determine how much sign-extension is going on. */
549 DEF_RTL_EXPR(SIGN_EXTEND, "sign_extend", "e", RTX_UNARY)
551 /* Similar for zero-extension (such as unsigned short to int). */
552 DEF_RTL_EXPR(ZERO_EXTEND, "zero_extend", "e", RTX_UNARY)
554 /* Similar but here the operand has a wider mode. */
555 DEF_RTL_EXPR(TRUNCATE, "truncate", "e", RTX_UNARY)
557 /* Similar for extending floating-point values (such as SFmode to DFmode). */
558 DEF_RTL_EXPR(FLOAT_EXTEND, "float_extend", "e", RTX_UNARY)
559 DEF_RTL_EXPR(FLOAT_TRUNCATE, "float_truncate", "e", RTX_UNARY)
561 /* Conversion of fixed point operand to floating point value. */
562 DEF_RTL_EXPR(FLOAT, "float", "e", RTX_UNARY)
564 /* With fixed-point machine mode:
565 Conversion of floating point operand to fixed point value.
566 Value is defined only when the operand's value is an integer.
567 With floating-point machine mode (and operand with same mode):
568 Operand is rounded toward zero to produce an integer value
569 represented in floating point. */
570 DEF_RTL_EXPR(FIX, "fix", "e", RTX_UNARY)
572 /* Conversion of unsigned fixed point operand to floating point value. */
573 DEF_RTL_EXPR(UNSIGNED_FLOAT, "unsigned_float", "e", RTX_UNARY)
575 /* With fixed-point machine mode:
576 Conversion of floating point operand to *unsigned* fixed point value.
577 Value is defined only when the operand's value is an integer. */
578 DEF_RTL_EXPR(UNSIGNED_FIX, "unsigned_fix", "e", RTX_UNARY)
581 DEF_RTL_EXPR(ABS, "abs", "e", RTX_UNARY)
584 DEF_RTL_EXPR(SQRT, "sqrt", "e", RTX_UNARY)
587 DEF_RTL_EXPR(BSWAP, "bswap", "e", RTX_UNARY)
589 /* Find first bit that is set.
590 Value is 1 + number of trailing zeros in the arg.,
592 DEF_RTL_EXPR(FFS, "ffs", "e", RTX_UNARY)
594 /* Count leading zeros. */
595 DEF_RTL_EXPR(CLZ, "clz", "e", RTX_UNARY)
597 /* Count trailing zeros. */
598 DEF_RTL_EXPR(CTZ, "ctz", "e", RTX_UNARY)
600 /* Population count (number of 1 bits). */
601 DEF_RTL_EXPR(POPCOUNT, "popcount", "e", RTX_UNARY)
603 /* Population parity (number of 1 bits modulo 2). */
604 DEF_RTL_EXPR(PARITY, "parity", "e", RTX_UNARY)
606 /* Reference to a signed bit-field of specified size and position.
607 Operand 0 is the memory unit (usually SImode or QImode) which
608 contains the field's first bit. Operand 1 is the width, in bits.
609 Operand 2 is the number of bits in the memory unit before the
610 first bit of this field.
611 If BITS_BIG_ENDIAN is defined, the first bit is the msb and
612 operand 2 counts from the msb of the memory unit.
613 Otherwise, the first bit is the lsb and operand 2 counts from
614 the lsb of the memory unit.
615 This kind of expression can not appear as an lvalue in RTL. */
616 DEF_RTL_EXPR(SIGN_EXTRACT, "sign_extract", "eee", RTX_BITFIELD_OPS)
618 /* Similar for unsigned bit-field.
619 But note! This kind of expression _can_ appear as an lvalue. */
620 DEF_RTL_EXPR(ZERO_EXTRACT, "zero_extract", "eee", RTX_BITFIELD_OPS)
622 /* For RISC machines. These save memory when splitting insns. */
624 /* HIGH are the high-order bits of a constant expression. */
625 DEF_RTL_EXPR(HIGH, "high", "e", RTX_CONST_OBJ)
627 /* LO_SUM is the sum of a register and the low-order bits
628 of a constant expression. */
629 DEF_RTL_EXPR(LO_SUM, "lo_sum", "ee", RTX_OBJ)
631 /* Describes a merge operation between two vector values.
632 Operands 0 and 1 are the vectors to be merged, operand 2 is a bitmask
633 that specifies where the parts of the result are taken from. Set bits
634 indicate operand 0, clear bits indicate operand 1. The parts are defined
635 by the mode of the vectors. */
636 DEF_RTL_EXPR(VEC_MERGE, "vec_merge", "eee", RTX_TERNARY)
638 /* Describes an operation that selects parts of a vector.
639 Operands 0 is the source vector, operand 1 is a PARALLEL that contains
640 a CONST_INT for each of the subparts of the result vector, giving the
641 number of the source subpart that should be stored into it. */
642 DEF_RTL_EXPR(VEC_SELECT, "vec_select", "ee", RTX_BIN_ARITH)
644 /* Describes a vector concat operation. Operands 0 and 1 are the source
645 vectors, the result is a vector that is as long as operands 0 and 1
646 combined and is the concatenation of the two source vectors. */
647 DEF_RTL_EXPR(VEC_CONCAT, "vec_concat", "ee", RTX_BIN_ARITH)
649 /* Describes an operation that converts a small vector into a larger one by
650 duplicating the input values. The output vector mode must have the same
651 submodes as the input vector mode, and the number of output parts must be
652 an integer multiple of the number of input parts. */
653 DEF_RTL_EXPR(VEC_DUPLICATE, "vec_duplicate", "e", RTX_UNARY)
655 /* Addition with signed saturation */
656 DEF_RTL_EXPR(SS_PLUS, "ss_plus", "ee", RTX_COMM_ARITH)
658 /* Addition with unsigned saturation */
659 DEF_RTL_EXPR(US_PLUS, "us_plus", "ee", RTX_COMM_ARITH)
661 /* Operand 0 minus operand 1, with signed saturation. */
662 DEF_RTL_EXPR(SS_MINUS, "ss_minus", "ee", RTX_BIN_ARITH)
664 /* Negation with signed saturation. */
665 DEF_RTL_EXPR(SS_NEG, "ss_neg", "e", RTX_UNARY)
667 /* Absolute value with signed saturation. */
668 DEF_RTL_EXPR(SS_ABS, "ss_abs", "e", RTX_UNARY)
670 /* Shift left with signed saturation. */
671 DEF_RTL_EXPR(SS_ASHIFT, "ss_ashift", "ee", RTX_BIN_ARITH)
673 /* Operand 0 minus operand 1, with unsigned saturation. */
674 DEF_RTL_EXPR(US_MINUS, "us_minus", "ee", RTX_BIN_ARITH)
676 /* Signed saturating truncate. */
677 DEF_RTL_EXPR(SS_TRUNCATE, "ss_truncate", "e", RTX_UNARY)
679 /* Unsigned saturating truncate. */
680 DEF_RTL_EXPR(US_TRUNCATE, "us_truncate", "e", RTX_UNARY)
682 /* Information about the variable and its location. */
683 /* Changed 'te' to 'tei'; the 'i' field is for recording
684 initialization status of variables. */
685 DEF_RTL_EXPR(VAR_LOCATION, "var_location", "tei", RTX_EXTRA)
687 /* All expressions from this point forward appear only in machine
689 #ifdef GENERATOR_FILE
691 /* Include a secondary machine-description file at this point. */
692 DEF_RTL_EXPR(INCLUDE, "include", "s", RTX_EXTRA)
694 /* Pattern-matching operators: */
696 /* Use the function named by the second arg (the string)
697 as a predicate; if matched, store the structure that was matched
698 in the operand table at index specified by the first arg (the integer).
699 If the second arg is the null string, the structure is just stored.
701 A third string argument indicates to the register allocator restrictions
702 on where the operand can be allocated.
704 If the target needs no restriction on any instruction this field should
707 The string is prepended by:
708 '=' to indicate the operand is only written to.
709 '+' to indicate the operand is both read and written to.
711 Each character in the string represents an allocable class for an operand.
712 'g' indicates the operand can be any valid class.
713 'i' indicates the operand can be immediate (in the instruction) data.
714 'r' indicates the operand can be in a register.
715 'm' indicates the operand can be in memory.
716 'o' a subset of the 'm' class. Those memory addressing modes that
717 can be offset at compile time (have a constant added to them).
719 Other characters indicate target dependent operand classes and
720 are described in each target's machine description.
722 For instructions with more than one operand, sets of classes can be
723 separated by a comma to indicate the appropriate multi-operand constraints.
724 There must be a 1 to 1 correspondence between these sets of classes in
725 all operands for an instruction.
727 DEF_RTL_EXPR(MATCH_OPERAND, "match_operand", "iss", RTX_MATCH)
729 /* Match a SCRATCH or a register. When used to generate rtl, a
730 SCRATCH is generated. As for MATCH_OPERAND, the mode specifies
731 the desired mode and the first argument is the operand number.
732 The second argument is the constraint. */
733 DEF_RTL_EXPR(MATCH_SCRATCH, "match_scratch", "is", RTX_MATCH)
735 /* Apply a predicate, AND match recursively the operands of the rtx.
736 Operand 0 is the operand-number, as in match_operand.
737 Operand 1 is a predicate to apply (as a string, a function name).
738 Operand 2 is a vector of expressions, each of which must match
739 one subexpression of the rtx this construct is matching. */
740 DEF_RTL_EXPR(MATCH_OPERATOR, "match_operator", "isE", RTX_MATCH)
742 /* Match a PARALLEL of arbitrary length. The predicate is applied
743 to the PARALLEL and the initial expressions in the PARALLEL are matched.
744 Operand 0 is the operand-number, as in match_operand.
745 Operand 1 is a predicate to apply to the PARALLEL.
746 Operand 2 is a vector of expressions, each of which must match the
747 corresponding element in the PARALLEL. */
748 DEF_RTL_EXPR(MATCH_PARALLEL, "match_parallel", "isE", RTX_MATCH)
750 /* Match only something equal to what is stored in the operand table
751 at the index specified by the argument. Use with MATCH_OPERAND. */
752 DEF_RTL_EXPR(MATCH_DUP, "match_dup", "i", RTX_MATCH)
754 /* Match only something equal to what is stored in the operand table
755 at the index specified by the argument. Use with MATCH_OPERATOR. */
756 DEF_RTL_EXPR(MATCH_OP_DUP, "match_op_dup", "iE", RTX_MATCH)
758 /* Match only something equal to what is stored in the operand table
759 at the index specified by the argument. Use with MATCH_PARALLEL. */
760 DEF_RTL_EXPR(MATCH_PAR_DUP, "match_par_dup", "iE", RTX_MATCH)
762 /* Appears only in define_predicate/define_special_predicate
763 expressions. Evaluates true only if the operand has an RTX code
764 from the set given by the argument (a comma-separated list). If the
765 second argument is present and nonempty, it is a sequence of digits
766 and/or letters which indicates the subexpression to test, using the
767 same syntax as genextract/genrecog's location strings: 0-9 for
768 XEXP (op, n), a-z for XVECEXP (op, 0, n); each character applies to
769 the result of the one before it. */
770 DEF_RTL_EXPR(MATCH_CODE, "match_code", "ss", RTX_MATCH)
772 /* Appears only in define_predicate/define_special_predicate
773 expressions. The argument is a C expression to be injected at this
774 point in the predicate formula. */
775 DEF_RTL_EXPR(MATCH_TEST, "match_test", "s", RTX_MATCH)
777 /* Insn (and related) definitions. */
779 /* Definition of the pattern for one kind of instruction.
781 0: names this instruction.
782 If the name is the null string, the instruction is in the
783 machine description just to be recognized, and will never be emitted by
784 the tree to rtl expander.
786 2: is a string which is a C expression
787 giving an additional condition for recognizing this pattern.
788 A null string means no extra condition.
789 3: is the action to execute if this pattern is matched.
790 If this assembler code template starts with a * then it is a fragment of
791 C code to run to decide on a template to use. Otherwise, it is the
793 4: optionally, a vector of attributes for this insn.
795 DEF_RTL_EXPR(DEFINE_INSN, "define_insn", "sEsTV", RTX_EXTRA)
797 /* Definition of a peephole optimization.
798 1st operand: vector of insn patterns to match
799 2nd operand: C expression that must be true
800 3rd operand: template or C code to produce assembler output.
801 4: optionally, a vector of attributes for this insn.
803 This form is deprecated; use define_peephole2 instead. */
804 DEF_RTL_EXPR(DEFINE_PEEPHOLE, "define_peephole", "EsTV", RTX_EXTRA)
806 /* Definition of a split operation.
807 1st operand: insn pattern to match
808 2nd operand: C expression that must be true
809 3rd operand: vector of insn patterns to place into a SEQUENCE
810 4th operand: optionally, some C code to execute before generating the
811 insns. This might, for example, create some RTX's and store them in
812 elements of `recog_data.operand' for use by the vector of
814 (`operands' is an alias here for `recog_data.operand'). */
815 DEF_RTL_EXPR(DEFINE_SPLIT, "define_split", "EsES", RTX_EXTRA)
817 /* Definition of an insn and associated split.
818 This is the concatenation, with a few modifications, of a define_insn
819 and a define_split which share the same pattern.
821 0: names this instruction.
822 If the name is the null string, the instruction is in the
823 machine description just to be recognized, and will never be emitted by
824 the tree to rtl expander.
826 2: is a string which is a C expression
827 giving an additional condition for recognizing this pattern.
828 A null string means no extra condition.
829 3: is the action to execute if this pattern is matched.
830 If this assembler code template starts with a * then it is a fragment of
831 C code to run to decide on a template to use. Otherwise, it is the
833 4: C expression that must be true for split. This may start with "&&"
834 in which case the split condition is the logical and of the insn
835 condition and what follows the "&&" of this operand.
836 5: vector of insn patterns to place into a SEQUENCE
837 6: optionally, some C code to execute before generating the
838 insns. This might, for example, create some RTX's and store them in
839 elements of `recog_data.operand' for use by the vector of
841 (`operands' is an alias here for `recog_data.operand').
842 7: optionally, a vector of attributes for this insn. */
843 DEF_RTL_EXPR(DEFINE_INSN_AND_SPLIT, "define_insn_and_split", "sEsTsESV", RTX_EXTRA)
845 /* Definition of an RTL peephole operation.
846 Follows the same arguments as define_split. */
847 DEF_RTL_EXPR(DEFINE_PEEPHOLE2, "define_peephole2", "EsES", RTX_EXTRA)
849 /* Define how to generate multiple insns for a standard insn name.
850 1st operand: the insn name.
851 2nd operand: vector of insn-patterns.
852 Use match_operand to substitute an element of `recog_data.operand'.
853 3rd operand: C expression that must be true for this to be available.
854 This may not test any operands.
855 4th operand: Extra C code to execute before generating the insns.
856 This might, for example, create some RTX's and store them in
857 elements of `recog_data.operand' for use by the vector of
859 (`operands' is an alias here for `recog_data.operand'). */
860 DEF_RTL_EXPR(DEFINE_EXPAND, "define_expand", "sEss", RTX_EXTRA)
862 /* Define a requirement for delay slots.
863 1st operand: Condition involving insn attributes that, if true,
864 indicates that the insn requires the number of delay slots
866 2nd operand: Vector whose length is the three times the number of delay
868 Each entry gives three conditions, each involving attributes.
869 The first must be true for an insn to occupy that delay slot
870 location. The second is true for all insns that can be
871 annulled if the branch is true and the third is true for all
872 insns that can be annulled if the branch is false.
874 Multiple DEFINE_DELAYs may be present. They indicate differing
875 requirements for delay slots. */
876 DEF_RTL_EXPR(DEFINE_DELAY, "define_delay", "eE", RTX_EXTRA)
878 /* Define attribute computation for `asm' instructions. */
879 DEF_RTL_EXPR(DEFINE_ASM_ATTRIBUTES, "define_asm_attributes", "V", RTX_EXTRA)
881 /* Definition of a conditional execution meta operation. Automatically
882 generates new instances of DEFINE_INSN, selected by having attribute
883 "predicable" true. The new pattern will contain a COND_EXEC and the
884 predicate at top-level.
887 0: The predicate pattern. The top-level form should match a
888 relational operator. Operands should have only one alternative.
889 1: A C expression giving an additional condition for recognizing
890 the generated pattern.
891 2: A template or C code to produce assembler output. */
892 DEF_RTL_EXPR(DEFINE_COND_EXEC, "define_cond_exec", "Ess", RTX_EXTRA)
894 /* Definition of an operand predicate. The difference between
895 DEFINE_PREDICATE and DEFINE_SPECIAL_PREDICATE is that genrecog will
896 not warn about a match_operand with no mode if it has a predicate
897 defined with DEFINE_SPECIAL_PREDICATE.
900 0: The name of the predicate.
901 1: A boolean expression which computes whether or not the predicate
902 matches. This expression can use IOR, AND, NOT, MATCH_OPERAND,
903 MATCH_CODE, and MATCH_TEST. It must be specific enough that genrecog
904 can calculate the set of RTX codes that can possibly match.
905 2: A C function body which must return true for the predicate to match.
906 Optional. Use this when the test is too complicated to fit into a
907 match_test expression. */
908 DEF_RTL_EXPR(DEFINE_PREDICATE, "define_predicate", "ses", RTX_EXTRA)
909 DEF_RTL_EXPR(DEFINE_SPECIAL_PREDICATE, "define_special_predicate", "ses", RTX_EXTRA)
911 /* Definition of a register operand constraint. This simply maps the
912 constraint string to a register class.
915 0: The name of the constraint (often, but not always, a single letter).
916 1: A C expression which evaluates to the appropriate register class for
917 this constraint. If this is not just a constant, it should look only
918 at -m switches and the like.
919 2: A docstring for this constraint, in Texinfo syntax; not currently
920 used, in future will be incorporated into the manual's list of
921 machine-specific operand constraints. */
922 DEF_RTL_EXPR(DEFINE_REGISTER_CONSTRAINT, "define_register_constraint", "sss", RTX_EXTRA)
924 /* Definition of a non-register operand constraint. These look at the
925 operand and decide whether it fits the constraint.
927 DEFINE_CONSTRAINT gets no special treatment if it fails to match.
928 It is appropriate for constant-only constraints, and most others.
930 DEFINE_MEMORY_CONSTRAINT tells reload that this constraint can be made
931 to match, if it doesn't already, by converting the operand to the form
932 (mem (reg X)) where X is a base register. It is suitable for constraints
933 that describe a subset of all memory references.
935 DEFINE_ADDRESS_CONSTRAINT tells reload that this constraint can be made
936 to match, if it doesn't already, by converting the operand to the form
937 (reg X) where X is a base register. It is suitable for constraints that
938 describe a subset of all address references.
940 When in doubt, use plain DEFINE_CONSTRAINT.
943 0: The name of the constraint (often, but not always, a single letter).
944 1: A docstring for this constraint, in Texinfo syntax; not currently
945 used, in future will be incorporated into the manual's list of
946 machine-specific operand constraints.
947 2: A boolean expression which computes whether or not the constraint
948 matches. It should follow the same rules as a define_predicate
949 expression, including the bit about specifying the set of RTX codes
950 that could possibly match. MATCH_TEST subexpressions may make use of
952 `op' - the RTL object defining the operand.
953 `mode' - the mode of `op'.
954 `ival' - INTVAL(op), if op is a CONST_INT.
955 `hval' - CONST_DOUBLE_HIGH(op), if op is an integer CONST_DOUBLE.
956 `lval' - CONST_DOUBLE_LOW(op), if op is an integer CONST_DOUBLE.
957 `rval' - CONST_DOUBLE_REAL_VALUE(op), if op is a floating-point
959 Do not use ival/hval/lval/rval if op is not the appropriate kind of
961 DEF_RTL_EXPR(DEFINE_CONSTRAINT, "define_constraint", "sse", RTX_EXTRA)
962 DEF_RTL_EXPR(DEFINE_MEMORY_CONSTRAINT, "define_memory_constraint", "sse", RTX_EXTRA)
963 DEF_RTL_EXPR(DEFINE_ADDRESS_CONSTRAINT, "define_address_constraint", "sse", RTX_EXTRA)
966 /* Constructions for CPU pipeline description described by NDFAs. */
968 /* (define_cpu_unit string [string]) describes cpu functional
969 units (separated by comma).
971 1st operand: Names of cpu functional units.
972 2nd operand: Name of automaton (see comments for DEFINE_AUTOMATON).
974 All define_reservations, define_cpu_units, and
975 define_query_cpu_units should have unique names which may not be
977 DEF_RTL_EXPR(DEFINE_CPU_UNIT, "define_cpu_unit", "sS", RTX_EXTRA)
979 /* (define_query_cpu_unit string [string]) describes cpu functional
980 units analogously to define_cpu_unit. The reservation of such
981 units can be queried for automaton state. */
982 DEF_RTL_EXPR(DEFINE_QUERY_CPU_UNIT, "define_query_cpu_unit", "sS", RTX_EXTRA)
984 /* (exclusion_set string string) means that each CPU functional unit
985 in the first string can not be reserved simultaneously with any
986 unit whose name is in the second string and vise versa. CPU units
987 in the string are separated by commas. For example, it is useful
988 for description CPU with fully pipelined floating point functional
989 unit which can execute simultaneously only single floating point
990 insns or only double floating point insns. All CPU functional
991 units in a set should belong to the same automaton. */
992 DEF_RTL_EXPR(EXCLUSION_SET, "exclusion_set", "ss", RTX_EXTRA)
994 /* (presence_set string string) means that each CPU functional unit in
995 the first string can not be reserved unless at least one of pattern
996 of units whose names are in the second string is reserved. This is
997 an asymmetric relation. CPU units or unit patterns in the strings
998 are separated by commas. Pattern is one unit name or unit names
999 separated by white-spaces.
1001 For example, it is useful for description that slot1 is reserved
1002 after slot0 reservation for a VLIW processor. We could describe it
1003 by the following construction
1005 (presence_set "slot1" "slot0")
1007 Or slot1 is reserved only after slot0 and unit b0 reservation. In
1008 this case we could write
1010 (presence_set "slot1" "slot0 b0")
1012 All CPU functional units in a set should belong to the same
1014 DEF_RTL_EXPR(PRESENCE_SET, "presence_set", "ss", RTX_EXTRA)
1016 /* (final_presence_set string string) is analogous to `presence_set'.
1017 The difference between them is when checking is done. When an
1018 instruction is issued in given automaton state reflecting all
1019 current and planned unit reservations, the automaton state is
1020 changed. The first state is a source state, the second one is a
1021 result state. Checking for `presence_set' is done on the source
1022 state reservation, checking for `final_presence_set' is done on the
1023 result reservation. This construction is useful to describe a
1024 reservation which is actually two subsequent reservations. For
1027 (presence_set "slot1" "slot0")
1029 the following insn will be never issued (because slot1 requires
1030 slot0 which is absent in the source state).
1032 (define_reservation "insn_and_nop" "slot0 + slot1")
1034 but it can be issued if we use analogous `final_presence_set'. */
1035 DEF_RTL_EXPR(FINAL_PRESENCE_SET, "final_presence_set", "ss", RTX_EXTRA)
1037 /* (absence_set string string) means that each CPU functional unit in
1038 the first string can be reserved only if each pattern of units
1039 whose names are in the second string is not reserved. This is an
1040 asymmetric relation (actually exclusion set is analogous to this
1041 one but it is symmetric). CPU units or unit patterns in the string
1042 are separated by commas. Pattern is one unit name or unit names
1043 separated by white-spaces.
1045 For example, it is useful for description that slot0 can not be
1046 reserved after slot1 or slot2 reservation for a VLIW processor. We
1047 could describe it by the following construction
1049 (absence_set "slot2" "slot0, slot1")
1051 Or slot2 can not be reserved if slot0 and unit b0 are reserved or
1052 slot1 and unit b1 are reserved . In this case we could write
1054 (absence_set "slot2" "slot0 b0, slot1 b1")
1056 All CPU functional units in a set should to belong the same
1058 DEF_RTL_EXPR(ABSENCE_SET, "absence_set", "ss", RTX_EXTRA)
1060 /* (final_absence_set string string) is analogous to `absence_set' but
1061 checking is done on the result (state) reservation. See comments
1062 for `final_presence_set'. */
1063 DEF_RTL_EXPR(FINAL_ABSENCE_SET, "final_absence_set", "ss", RTX_EXTRA)
1065 /* (define_bypass number out_insn_names in_insn_names) names bypass
1066 with given latency (the first number) from insns given by the first
1067 string (see define_insn_reservation) into insns given by the second
1068 string. Insn names in the strings are separated by commas. The
1069 third operand is optional name of function which is additional
1070 guard for the bypass. The function will get the two insns as
1071 parameters. If the function returns zero the bypass will be
1072 ignored for this case. Additional guard is necessary to recognize
1073 complicated bypasses, e.g. when consumer is load address. */
1074 DEF_RTL_EXPR(DEFINE_BYPASS, "define_bypass", "issS", RTX_EXTRA)
1076 /* (define_automaton string) describes names of automata generated and
1077 used for pipeline hazards recognition. The names are separated by
1078 comma. Actually it is possibly to generate the single automaton
1079 but unfortunately it can be very large. If we use more one
1080 automata, the summary size of the automata usually is less than the
1081 single one. The automaton name is used in define_cpu_unit and
1082 define_query_cpu_unit. All automata should have unique names. */
1083 DEF_RTL_EXPR(DEFINE_AUTOMATON, "define_automaton", "s", RTX_EXTRA)
1085 /* (automata_option string) describes option for generation of
1086 automata. Currently there are the following options:
1088 o "no-minimization" which makes no minimization of automata. This
1089 is only worth to do when we are debugging the description and
1090 need to look more accurately at reservations of states.
1092 o "time" which means printing additional time statistics about
1093 generation of automata.
1095 o "v" which means generation of file describing the result
1096 automata. The file has suffix `.dfa' and can be used for the
1097 description verification and debugging.
1099 o "w" which means generation of warning instead of error for
1100 non-critical errors.
1102 o "ndfa" which makes nondeterministic finite state automata.
1104 o "progress" which means output of a progress bar showing how many
1105 states were generated so far for automaton being processed. */
1106 DEF_RTL_EXPR(AUTOMATA_OPTION, "automata_option", "s", RTX_EXTRA)
1108 /* (define_reservation string string) names reservation (the first
1109 string) of cpu functional units (the 2nd string). Sometimes unit
1110 reservations for different insns contain common parts. In such
1111 case, you can describe common part and use its name (the 1st
1112 parameter) in regular expression in define_insn_reservation. All
1113 define_reservations, define_cpu_units, and define_query_cpu_units
1114 should have unique names which may not be "nothing". */
1115 DEF_RTL_EXPR(DEFINE_RESERVATION, "define_reservation", "ss", RTX_EXTRA)
1117 /* (define_insn_reservation name default_latency condition regexpr)
1118 describes reservation of cpu functional units (the 3nd operand) for
1119 instruction which is selected by the condition (the 2nd parameter).
1120 The first parameter is used for output of debugging information.
1121 The reservations are described by a regular expression according
1122 the following syntax:
1124 regexp = regexp "," oneof
1127 oneof = oneof "|" allof
1130 allof = allof "+" repeat
1133 repeat = element "*" number
1136 element = cpu_function_unit_name
1142 1. "," is used for describing start of the next cycle in
1145 2. "|" is used for describing the reservation described by the
1146 first regular expression *or* the reservation described by the
1147 second regular expression *or* etc.
1149 3. "+" is used for describing the reservation described by the
1150 first regular expression *and* the reservation described by the
1151 second regular expression *and* etc.
1153 4. "*" is used for convenience and simply means sequence in
1154 which the regular expression are repeated NUMBER times with
1155 cycle advancing (see ",").
1157 5. cpu functional unit name which means its reservation.
1159 6. reservation name -- see define_reservation.
1161 7. string "nothing" means no units reservation. */
1163 DEF_RTL_EXPR(DEFINE_INSN_RESERVATION, "define_insn_reservation", "sies", RTX_EXTRA)
1165 /* Expressions used for insn attributes. */
1167 /* Definition of an insn attribute.
1168 1st operand: name of the attribute
1169 2nd operand: comma-separated list of possible attribute values
1170 3rd operand: expression for the default value of the attribute. */
1171 DEF_RTL_EXPR(DEFINE_ATTR, "define_attr", "sse", RTX_EXTRA)
1173 /* Marker for the name of an attribute. */
1174 DEF_RTL_EXPR(ATTR, "attr", "s", RTX_EXTRA)
1176 /* For use in the last (optional) operand of DEFINE_INSN or DEFINE_PEEPHOLE and
1177 in DEFINE_ASM_INSN to specify an attribute to assign to insns matching that
1180 (set_attr "name" "value") is equivalent to
1181 (set (attr "name") (const_string "value")) */
1182 DEF_RTL_EXPR(SET_ATTR, "set_attr", "ss", RTX_EXTRA)
1184 /* In the last operand of DEFINE_INSN and DEFINE_PEEPHOLE, this can be used to
1185 specify that attribute values are to be assigned according to the
1186 alternative matched.
1188 The following three expressions are equivalent:
1190 (set (attr "att") (cond [(eq_attrq "alternative" "1") (const_string "a1")
1191 (eq_attrq "alternative" "2") (const_string "a2")]
1192 (const_string "a3")))
1193 (set_attr_alternative "att" [(const_string "a1") (const_string "a2")
1194 (const_string "a3")])
1195 (set_attr "att" "a1,a2,a3")
1197 DEF_RTL_EXPR(SET_ATTR_ALTERNATIVE, "set_attr_alternative", "sE", RTX_EXTRA)
1199 /* A conditional expression true if the value of the specified attribute of
1200 the current insn equals the specified value. The first operand is the
1201 attribute name and the second is the comparison value. */
1202 DEF_RTL_EXPR(EQ_ATTR, "eq_attr", "ss", RTX_EXTRA)
1204 /* A special case of the above representing a set of alternatives. The first
1205 operand is bitmap of the set, the second one is the default value. */
1206 DEF_RTL_EXPR(EQ_ATTR_ALT, "eq_attr_alt", "ii", RTX_EXTRA)
1208 /* A conditional expression which is true if the specified flag is
1209 true for the insn being scheduled in reorg.
1211 genattr.c defines the following flags which can be tested by
1212 (attr_flag "foo") expressions in eligible_for_delay.
1214 forward, backward, very_likely, likely, very_unlikely, and unlikely. */
1216 DEF_RTL_EXPR (ATTR_FLAG, "attr_flag", "s", RTX_EXTRA)
1218 /* General conditional. The first operand is a vector composed of pairs of
1219 expressions. The first element of each pair is evaluated, in turn.
1220 The value of the conditional is the second expression of the first pair
1221 whose first expression evaluates nonzero. If none of the expressions is
1222 true, the second operand will be used as the value of the conditional. */
1223 DEF_RTL_EXPR(COND, "cond", "Ee", RTX_EXTRA)
1225 #endif /* GENERATOR_FILE */