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 3, 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 COPYING3. If not see
22 <http://www.gnu.org/licenses/>. */
25 /* Expression definitions and descriptions for all targets are in this file.
26 Some will not be used for some targets.
28 The fields in the cpp macro call "DEF_RTL_EXPR()"
29 are used to create declarations in the C source of the compiler.
33 1. The internal name of the rtx used in the C source.
34 It is a tag in the enumeration "enum rtx_code" defined in "rtl.h".
35 By convention these are in UPPER_CASE.
37 2. The name of the rtx in the external ASCII format read by
38 read_rtx(), and printed by print_rtx().
39 These names are stored in rtx_name[].
40 By convention these are the internal (field 1) names in lower_case.
42 3. The print format, and type of each rtx->u.fld[] (field) in this rtx.
43 These formats are stored in rtx_format[].
44 The meaning of the formats is documented in front of this array in rtl.c
46 4. The class of the rtx. These are stored in rtx_class and are accessed
47 via the GET_RTX_CLASS macro. They are defined as follows:
50 an rtx code that can be used to represent a constant object
53 an rtx code that can be used to represent an object (e.g, REG, MEM)
55 an rtx code for a comparison (e.g, LT, GT)
57 an rtx code for a commutative comparison (e.g, EQ, NE, ORDERED)
59 an rtx code for a unary arithmetic expression (e.g, NEG, NOT)
61 an rtx code for a commutative binary operation (e.g,, PLUS, MULT)
63 an rtx code for a non-bitfield three input operation (IF_THEN_ELSE)
65 an rtx code for a non-commutative binary operation (e.g., MINUS, DIV)
67 an rtx code for a bit-field operation (ZERO_EXTRACT, SIGN_EXTRACT)
69 an rtx code for a machine insn (INSN, JUMP_INSN, CALL_INSN)
71 an rtx code for something that matches in insns (e.g, MATCH_DUP)
73 an rtx code for autoincrement addressing modes (e.g. POST_DEC)
77 All of the expressions that appear only in machine descriptions,
78 not in RTL used by the compiler itself, are at the end of the file. */
80 /* Unknown, or no such operation; the enumeration constant should have
82 DEF_RTL_EXPR(UNKNOWN, "UnKnown", "*", RTX_EXTRA)
84 /* ---------------------------------------------------------------------
85 Expressions used in constructing lists.
86 --------------------------------------------------------------------- */
88 /* a linked list of expressions */
89 DEF_RTL_EXPR(EXPR_LIST, "expr_list", "ee", RTX_EXTRA)
91 /* a linked list of instructions.
92 The insns are represented in print by their uids. */
93 DEF_RTL_EXPR(INSN_LIST, "insn_list", "ue", RTX_EXTRA)
95 /* SEQUENCE appears in the result of a `gen_...' function
96 for a DEFINE_EXPAND that wants to make several insns.
97 Its elements are the bodies of the insns that should be made.
98 `emit_insn' takes the SEQUENCE apart and makes separate insns. */
99 DEF_RTL_EXPR(SEQUENCE, "sequence", "E", RTX_EXTRA)
101 /* Refers to the address of its argument. This is only used in alias.c. */
102 DEF_RTL_EXPR(ADDRESS, "address", "e", RTX_MATCH)
104 /* ----------------------------------------------------------------------
105 Expression types used for things in the instruction chain.
107 All formats must start with "iuu" to handle the chain.
108 Each insn expression holds an rtl instruction and its semantics
109 during back-end processing.
110 See macros's in "rtl.h" for the meaning of each rtx->u.fld[].
112 ---------------------------------------------------------------------- */
114 /* An instruction that cannot jump. */
115 DEF_RTL_EXPR(INSN, "insn", "iuuBieie", RTX_INSN)
117 /* An instruction that can possibly jump.
118 Fields ( rtx->u.fld[] ) have exact same meaning as INSN's. */
119 DEF_RTL_EXPR(JUMP_INSN, "jump_insn", "iuuBieie0", RTX_INSN)
121 /* An instruction that can possibly call a subroutine
122 but which will not change which instruction comes next
123 in the current function.
124 Field ( rtx->u.fld[8] ) is CALL_INSN_FUNCTION_USAGE.
125 All other fields ( rtx->u.fld[] ) have exact same meaning as INSN's. */
126 DEF_RTL_EXPR(CALL_INSN, "call_insn", "iuuBieiee", RTX_INSN)
128 /* A marker that indicates that control will not flow through. */
129 DEF_RTL_EXPR(BARRIER, "barrier", "iuu00000", RTX_EXTRA)
131 /* Holds a label that is followed by instructions.
133 4: is used in jump.c for the use-count of the label.
134 5: is used in the sh backend.
135 6: is a number that is unique in the entire compilation.
136 7: is the user-given name of the label, if any. */
137 DEF_RTL_EXPR(CODE_LABEL, "code_label", "iuuB00is", RTX_EXTRA)
139 /* Say where in the code a source line starts, for symbol table's sake.
141 4: note-specific data
143 6: unique number if insn_note == note_insn_deleted_label. */
144 DEF_RTL_EXPR(NOTE, "note", "iuuB0ni", RTX_EXTRA)
146 /* ----------------------------------------------------------------------
147 Top level constituents of INSN, JUMP_INSN and CALL_INSN.
148 ---------------------------------------------------------------------- */
150 /* Conditionally execute code.
151 Operand 0 is the condition that if true, the code is executed.
152 Operand 1 is the code to be executed (typically a SET).
154 Semantics are that there are no side effects if the condition
155 is false. This pattern is created automatically by the if_convert
156 pass run after reload or by target-specific splitters. */
157 DEF_RTL_EXPR(COND_EXEC, "cond_exec", "ee", RTX_EXTRA)
159 /* Several operations to be done in parallel (perhaps under COND_EXEC). */
160 DEF_RTL_EXPR(PARALLEL, "parallel", "E", RTX_EXTRA)
162 /* A string that is passed through to the assembler as input.
163 One can obviously pass comments through by using the
164 assembler comment syntax.
165 These occur in an insn all by themselves as the PATTERN.
166 They also appear inside an ASM_OPERANDS
167 as a convenient way to hold a string. */
168 DEF_RTL_EXPR(ASM_INPUT, "asm_input", "si", RTX_EXTRA)
170 /* An assembler instruction with operands.
171 1st operand is the instruction template.
172 2nd operand is the constraint for the output.
173 3rd operand is the number of the output this expression refers to.
174 When an insn stores more than one value, a separate ASM_OPERANDS
175 is made for each output; this integer distinguishes them.
176 4th is a vector of values of input operands.
177 5th is a vector of modes and constraints for the input operands.
178 Each element is an ASM_INPUT containing a constraint string
179 and whose mode indicates the mode of the input operand.
180 6th is the source line number. */
181 DEF_RTL_EXPR(ASM_OPERANDS, "asm_operands", "ssiEEi", RTX_EXTRA)
183 /* A machine-specific operation.
184 1st operand is a vector of operands being used by the operation so that
185 any needed reloads can be done.
186 2nd operand is a unique value saying which of a number of machine-specific
187 operations is to be performed.
188 (Note that the vector must be the first operand because of the way that
189 genrecog.c record positions within an insn.)
191 UNSPEC can occur all by itself in a PATTERN, as a component of a PARALLEL,
192 or inside an expression.
193 UNSPEC by itself or as a component of a PARALLEL
194 is currently considered not deletable.
196 FIXME: Replace all uses of UNSPEC that appears by itself or as a component
197 of a PARALLEL with USE.
199 DEF_RTL_EXPR(UNSPEC, "unspec", "Ei", RTX_EXTRA)
201 /* Similar, but a volatile operation and one which may trap. */
202 DEF_RTL_EXPR(UNSPEC_VOLATILE, "unspec_volatile", "Ei", RTX_EXTRA)
204 /* Vector of addresses, stored as full words. */
205 /* Each element is a LABEL_REF to a CODE_LABEL whose address we want. */
206 DEF_RTL_EXPR(ADDR_VEC, "addr_vec", "E", RTX_EXTRA)
208 /* Vector of address differences X0 - BASE, X1 - BASE, ...
209 First operand is BASE; the vector contains the X's.
210 The machine mode of this rtx says how much space to leave
211 for each difference and is adjusted by branch shortening if
212 CASE_VECTOR_SHORTEN_MODE is defined.
213 The third and fourth operands store the target labels with the
214 minimum and maximum addresses respectively.
215 The fifth operand stores flags for use by branch shortening.
216 Set at the start of shorten_branches:
217 min_align: the minimum alignment for any of the target labels.
218 base_after_vec: true iff BASE is after the ADDR_DIFF_VEC.
219 min_after_vec: true iff minimum addr target label is after the ADDR_DIFF_VEC.
220 max_after_vec: true iff maximum addr target label is after the ADDR_DIFF_VEC.
221 min_after_base: true iff minimum address target label is after BASE.
222 max_after_base: true iff maximum address target label is after BASE.
223 Set by the actual branch shortening process:
224 offset_unsigned: true iff offsets have to be treated as unsigned.
225 scale: scaling that is necessary to make offsets fit into the mode.
227 The third, fourth and fifth operands are only valid when
228 CASE_VECTOR_SHORTEN_MODE is defined, and only in an optimizing
231 DEF_RTL_EXPR(ADDR_DIFF_VEC, "addr_diff_vec", "eEee0", RTX_EXTRA)
233 /* Memory prefetch, with attributes supported on some targets.
234 Operand 1 is the address of the memory to fetch.
235 Operand 2 is 1 for a write access, 0 otherwise.
236 Operand 3 is the level of temporal locality; 0 means there is no
237 temporal locality and 1, 2, and 3 are for increasing levels of temporal
240 The attributes specified by operands 2 and 3 are ignored for targets
241 whose prefetch instructions do not support them. */
242 DEF_RTL_EXPR(PREFETCH, "prefetch", "eee", RTX_EXTRA)
244 /* ----------------------------------------------------------------------
245 At the top level of an instruction (perhaps under PARALLEL).
246 ---------------------------------------------------------------------- */
249 Operand 1 is the location (REG, MEM, PC, CC0 or whatever) assigned to.
250 Operand 2 is the value stored there.
251 ALL assignment must use SET.
252 Instructions that do multiple assignments must use multiple SET,
254 DEF_RTL_EXPR(SET, "set", "ee", RTX_EXTRA)
256 /* Indicate something is used in a way that we don't want to explain.
257 For example, subroutine calls will use the register
258 in which the static chain is passed.
260 USE can not appear as an operand of other rtx except for PARALLEL.
261 USE is not deletable, as it indicates that the operand
262 is used in some unknown way. */
263 DEF_RTL_EXPR(USE, "use", "e", RTX_EXTRA)
265 /* Indicate something is clobbered in a way that we don't want to explain.
266 For example, subroutine calls will clobber some physical registers
267 (the ones that are by convention not saved).
269 CLOBBER can not appear as an operand of other rtx except for PARALLEL.
270 CLOBBER of a hard register appearing by itself (not within PARALLEL)
271 is considered undeletable before reload. */
272 DEF_RTL_EXPR(CLOBBER, "clobber", "e", RTX_EXTRA)
274 /* Call a subroutine.
275 Operand 1 is the address to call.
276 Operand 2 is the number of arguments. */
278 DEF_RTL_EXPR(CALL, "call", "ee", RTX_EXTRA)
280 /* Return from a subroutine. */
282 DEF_RTL_EXPR(RETURN, "return", "", RTX_EXTRA)
285 Operand 1 is the condition.
286 Operand 2 is the trap code.
287 For an unconditional trap, make the condition (const_int 1). */
288 DEF_RTL_EXPR(TRAP_IF, "trap_if", "ee", RTX_EXTRA)
290 /* Placeholder for _Unwind_Resume before we know if a function call
291 or a branch is needed. Operand 1 is the exception region from
292 which control is flowing. */
293 DEF_RTL_EXPR(RESX, "resx", "i", RTX_EXTRA)
295 /* ----------------------------------------------------------------------
296 Primitive values for use in expressions.
297 ---------------------------------------------------------------------- */
299 /* numeric integer constant */
300 DEF_RTL_EXPR(CONST_INT, "const_int", "w", RTX_CONST_OBJ)
302 /* fixed-point constant */
303 DEF_RTL_EXPR(CONST_FIXED, "const_fixed", "www", RTX_CONST_OBJ)
305 /* numeric floating point constant.
306 Operands hold the value. They are all 'w' and there may be from 2 to 6;
308 DEF_RTL_EXPR(CONST_DOUBLE, "const_double", CONST_DOUBLE_FORMAT, RTX_CONST_OBJ)
310 /* Describes a vector constant. */
311 DEF_RTL_EXPR(CONST_VECTOR, "const_vector", "E", RTX_CONST_OBJ)
313 /* String constant. Used for attributes in machine descriptions and
314 for special cases in DWARF2 debug output. NOT used for source-
315 language string constants. */
316 DEF_RTL_EXPR(CONST_STRING, "const_string", "s", RTX_OBJ)
318 /* This is used to encapsulate an expression whose value is constant
319 (such as the sum of a SYMBOL_REF and a CONST_INT) so that it will be
320 recognized as a constant operand rather than by arithmetic instructions. */
322 DEF_RTL_EXPR(CONST, "const", "e", RTX_CONST_OBJ)
324 /* program counter. Ordinary jumps are represented
325 by a SET whose first operand is (PC). */
326 DEF_RTL_EXPR(PC, "pc", "", RTX_OBJ)
328 /* Used in the cselib routines to describe a value. Objects of this
329 kind are only allocated in cselib.c, in an alloc pool instead of
330 in GC memory. The only operand of a VALUE is a cselib_val_struct. */
331 DEF_RTL_EXPR(VALUE, "value", "0", RTX_OBJ)
333 /* A register. The "operand" is the register number, accessed with
334 the REGNO macro. If this number is less than FIRST_PSEUDO_REGISTER
335 than a hardware register is being referred to. The second operand
336 holds the original register number - this will be different for a
337 pseudo register that got turned into a hard register. The third
338 operand points to a reg_attrs structure.
339 This rtx needs to have as many (or more) fields as a MEM, since we
340 can change REG rtx's into MEMs during reload. */
341 DEF_RTL_EXPR(REG, "reg", "i00", RTX_OBJ)
343 /* A scratch register. This represents a register used only within a
344 single insn. It will be turned into a REG during register allocation
345 or reload unless the constraint indicates that the register won't be
346 needed, in which case it can remain a SCRATCH. This code is
347 marked as having one operand so it can be turned into a REG. */
348 DEF_RTL_EXPR(SCRATCH, "scratch", "0", RTX_OBJ)
350 /* A reference to a part of another value. The first operand is the
351 complete value and the second is the byte offset of the selected part. */
352 DEF_RTL_EXPR(SUBREG, "subreg", "ei", RTX_EXTRA)
354 /* This one-argument rtx is used for move instructions
355 that are guaranteed to alter only the low part of a destination.
356 Thus, (SET (SUBREG:HI (REG...)) (MEM:HI ...))
357 has an unspecified effect on the high part of REG,
358 but (SET (STRICT_LOW_PART (SUBREG:HI (REG...))) (MEM:HI ...))
359 is guaranteed to alter only the bits of REG that are in HImode.
361 The actual instruction used is probably the same in both cases,
362 but the register constraints may be tighter when STRICT_LOW_PART
365 DEF_RTL_EXPR(STRICT_LOW_PART, "strict_low_part", "e", RTX_EXTRA)
367 /* (CONCAT a b) represents the virtual concatenation of a and b
368 to make a value that has as many bits as a and b put together.
369 This is used for complex values. Normally it appears only
370 in DECL_RTLs and during RTL generation, but not in the insn chain. */
371 DEF_RTL_EXPR(CONCAT, "concat", "ee", RTX_OBJ)
373 /* (CONCATN [a1 a2 ... an]) represents the virtual concatenation of
374 all An to make a value. This is an extension of CONCAT to larger
375 number of components. Like CONCAT, it should not appear in the
376 insn chain. Every element of the CONCATN is the same size. */
377 DEF_RTL_EXPR(CONCATN, "concatn", "E", RTX_OBJ)
379 /* A memory location; operand is the address. The second operand is the
380 alias set to which this MEM belongs. We use `0' instead of `w' for this
381 field so that the field need not be specified in machine descriptions. */
382 DEF_RTL_EXPR(MEM, "mem", "e0", RTX_OBJ)
384 /* Reference to an assembler label in the code for this function.
385 The operand is a CODE_LABEL found in the insn chain. */
386 DEF_RTL_EXPR(LABEL_REF, "label_ref", "u", RTX_CONST_OBJ)
388 /* Reference to a named label:
389 Operand 0: label name
390 Operand 1: flags (see SYMBOL_FLAG_* in rtl.h)
391 Operand 2: tree from which this symbol is derived, or null.
392 This is either a DECL node, or some kind of constant. */
393 DEF_RTL_EXPR(SYMBOL_REF, "symbol_ref", "s00", RTX_CONST_OBJ)
395 /* The condition code register is represented, in our imagination,
396 as a register holding a value that can be compared to zero.
397 In fact, the machine has already compared them and recorded the
398 results; but instructions that look at the condition code
399 pretend to be looking at the entire value and comparing it. */
400 DEF_RTL_EXPR(CC0, "cc0", "", RTX_OBJ)
402 /* ----------------------------------------------------------------------
403 Expressions for operators in an rtl pattern
404 ---------------------------------------------------------------------- */
406 /* if_then_else. This is used in representing ordinary
407 conditional jump instructions.
412 DEF_RTL_EXPR(IF_THEN_ELSE, "if_then_else", "eee", RTX_TERNARY)
414 /* Comparison, produces a condition code result. */
415 DEF_RTL_EXPR(COMPARE, "compare", "ee", RTX_BIN_ARITH)
418 DEF_RTL_EXPR(PLUS, "plus", "ee", RTX_COMM_ARITH)
420 /* Operand 0 minus operand 1. */
421 DEF_RTL_EXPR(MINUS, "minus", "ee", RTX_BIN_ARITH)
423 /* Minus operand 0. */
424 DEF_RTL_EXPR(NEG, "neg", "e", RTX_UNARY)
426 DEF_RTL_EXPR(MULT, "mult", "ee", RTX_COMM_ARITH)
428 /* Multiplication with signed saturation */
429 DEF_RTL_EXPR(SS_MULT, "ss_mult", "ee", RTX_COMM_ARITH)
430 /* Multiplication with unsigned saturation */
431 DEF_RTL_EXPR(US_MULT, "us_mult", "ee", RTX_COMM_ARITH)
433 /* Operand 0 divided by operand 1. */
434 DEF_RTL_EXPR(DIV, "div", "ee", RTX_BIN_ARITH)
435 /* Division with signed saturation */
436 DEF_RTL_EXPR(SS_DIV, "ss_div", "ee", RTX_BIN_ARITH)
437 /* Division with unsigned saturation */
438 DEF_RTL_EXPR(US_DIV, "us_div", "ee", RTX_BIN_ARITH)
440 /* Remainder of operand 0 divided by operand 1. */
441 DEF_RTL_EXPR(MOD, "mod", "ee", RTX_BIN_ARITH)
443 /* Unsigned divide and remainder. */
444 DEF_RTL_EXPR(UDIV, "udiv", "ee", RTX_BIN_ARITH)
445 DEF_RTL_EXPR(UMOD, "umod", "ee", RTX_BIN_ARITH)
447 /* Bitwise operations. */
448 DEF_RTL_EXPR(AND, "and", "ee", RTX_COMM_ARITH)
449 DEF_RTL_EXPR(IOR, "ior", "ee", RTX_COMM_ARITH)
450 DEF_RTL_EXPR(XOR, "xor", "ee", RTX_COMM_ARITH)
451 DEF_RTL_EXPR(NOT, "not", "e", RTX_UNARY)
454 0: value to be shifted.
455 1: number of bits. */
456 DEF_RTL_EXPR(ASHIFT, "ashift", "ee", RTX_BIN_ARITH) /* shift left */
457 DEF_RTL_EXPR(ROTATE, "rotate", "ee", RTX_BIN_ARITH) /* rotate left */
458 DEF_RTL_EXPR(ASHIFTRT, "ashiftrt", "ee", RTX_BIN_ARITH) /* arithmetic shift right */
459 DEF_RTL_EXPR(LSHIFTRT, "lshiftrt", "ee", RTX_BIN_ARITH) /* logical shift right */
460 DEF_RTL_EXPR(ROTATERT, "rotatert", "ee", RTX_BIN_ARITH) /* rotate right */
462 /* Minimum and maximum values of two operands. We need both signed and
463 unsigned forms. (We cannot use MIN for SMIN because it conflicts
464 with a macro of the same name.) The signed variants should be used
465 with floating point. Further, if both operands are zeros, or if either
466 operand is NaN, then it is unspecified which of the two operands is
467 returned as the result. */
469 DEF_RTL_EXPR(SMIN, "smin", "ee", RTX_COMM_ARITH)
470 DEF_RTL_EXPR(SMAX, "smax", "ee", RTX_COMM_ARITH)
471 DEF_RTL_EXPR(UMIN, "umin", "ee", RTX_COMM_ARITH)
472 DEF_RTL_EXPR(UMAX, "umax", "ee", RTX_COMM_ARITH)
474 /* These unary operations are used to represent incrementation
475 and decrementation as they occur in memory addresses.
476 The amount of increment or decrement are not represented
477 because they can be understood from the machine-mode of the
478 containing MEM. These operations exist in only two cases:
479 1. pushes onto the stack.
480 2. created automatically by the life_analysis pass in flow.c. */
481 DEF_RTL_EXPR(PRE_DEC, "pre_dec", "e", RTX_AUTOINC)
482 DEF_RTL_EXPR(PRE_INC, "pre_inc", "e", RTX_AUTOINC)
483 DEF_RTL_EXPR(POST_DEC, "post_dec", "e", RTX_AUTOINC)
484 DEF_RTL_EXPR(POST_INC, "post_inc", "e", RTX_AUTOINC)
486 /* These binary operations are used to represent generic address
487 side-effects in memory addresses, except for simple incrementation
488 or decrementation which use the above operations. They are
489 created automatically by the life_analysis pass in flow.c.
490 The first operand is a REG which is used as the address.
491 The second operand is an expression that is assigned to the
492 register, either before (PRE_MODIFY) or after (POST_MODIFY)
493 evaluating the address.
494 Currently, the compiler can only handle second operands of the
495 form (plus (reg) (reg)) and (plus (reg) (const_int)), where
496 the first operand of the PLUS has to be the same register as
497 the first operand of the *_MODIFY. */
498 DEF_RTL_EXPR(PRE_MODIFY, "pre_modify", "ee", RTX_AUTOINC)
499 DEF_RTL_EXPR(POST_MODIFY, "post_modify", "ee", RTX_AUTOINC)
501 /* Comparison operations. The ordered comparisons exist in two
502 flavors, signed and unsigned. */
503 DEF_RTL_EXPR(NE, "ne", "ee", RTX_COMM_COMPARE)
504 DEF_RTL_EXPR(EQ, "eq", "ee", RTX_COMM_COMPARE)
505 DEF_RTL_EXPR(GE, "ge", "ee", RTX_COMPARE)
506 DEF_RTL_EXPR(GT, "gt", "ee", RTX_COMPARE)
507 DEF_RTL_EXPR(LE, "le", "ee", RTX_COMPARE)
508 DEF_RTL_EXPR(LT, "lt", "ee", RTX_COMPARE)
509 DEF_RTL_EXPR(GEU, "geu", "ee", RTX_COMPARE)
510 DEF_RTL_EXPR(GTU, "gtu", "ee", RTX_COMPARE)
511 DEF_RTL_EXPR(LEU, "leu", "ee", RTX_COMPARE)
512 DEF_RTL_EXPR(LTU, "ltu", "ee", RTX_COMPARE)
514 /* Additional floating point unordered comparison flavors. */
515 DEF_RTL_EXPR(UNORDERED, "unordered", "ee", RTX_COMM_COMPARE)
516 DEF_RTL_EXPR(ORDERED, "ordered", "ee", RTX_COMM_COMPARE)
518 /* These are equivalent to unordered or ... */
519 DEF_RTL_EXPR(UNEQ, "uneq", "ee", RTX_COMM_COMPARE)
520 DEF_RTL_EXPR(UNGE, "unge", "ee", RTX_COMPARE)
521 DEF_RTL_EXPR(UNGT, "ungt", "ee", RTX_COMPARE)
522 DEF_RTL_EXPR(UNLE, "unle", "ee", RTX_COMPARE)
523 DEF_RTL_EXPR(UNLT, "unlt", "ee", RTX_COMPARE)
525 /* This is an ordered NE, ie !UNEQ, ie false for NaN. */
526 DEF_RTL_EXPR(LTGT, "ltgt", "ee", RTX_COMM_COMPARE)
528 /* Represents the result of sign-extending the sole operand.
529 The machine modes of the operand and of the SIGN_EXTEND expression
530 determine how much sign-extension is going on. */
531 DEF_RTL_EXPR(SIGN_EXTEND, "sign_extend", "e", RTX_UNARY)
533 /* Similar for zero-extension (such as unsigned short to int). */
534 DEF_RTL_EXPR(ZERO_EXTEND, "zero_extend", "e", RTX_UNARY)
536 /* Similar but here the operand has a wider mode. */
537 DEF_RTL_EXPR(TRUNCATE, "truncate", "e", RTX_UNARY)
539 /* Similar for extending floating-point values (such as SFmode to DFmode). */
540 DEF_RTL_EXPR(FLOAT_EXTEND, "float_extend", "e", RTX_UNARY)
541 DEF_RTL_EXPR(FLOAT_TRUNCATE, "float_truncate", "e", RTX_UNARY)
543 /* Conversion of fixed point operand to floating point value. */
544 DEF_RTL_EXPR(FLOAT, "float", "e", RTX_UNARY)
546 /* With fixed-point machine mode:
547 Conversion of floating point operand to fixed point value.
548 Value is defined only when the operand's value is an integer.
549 With floating-point machine mode (and operand with same mode):
550 Operand is rounded toward zero to produce an integer value
551 represented in floating point. */
552 DEF_RTL_EXPR(FIX, "fix", "e", RTX_UNARY)
554 /* Conversion of unsigned fixed point operand to floating point value. */
555 DEF_RTL_EXPR(UNSIGNED_FLOAT, "unsigned_float", "e", RTX_UNARY)
557 /* With fixed-point machine mode:
558 Conversion of floating point operand to *unsigned* fixed point value.
559 Value is defined only when the operand's value is an integer. */
560 DEF_RTL_EXPR(UNSIGNED_FIX, "unsigned_fix", "e", RTX_UNARY)
562 /* Conversions involving fractional fixed-point types without saturation,
564 fractional to fractional (of different precision),
565 signed integer to fractional,
566 fractional to signed integer,
567 floating point to fractional,
568 fractional to floating point.
569 NOTE: fractional can be either signed or unsigned for conversions. */
570 DEF_RTL_EXPR(FRACT_CONVERT, "fract_convert", "e", RTX_UNARY)
572 /* Conversions involving fractional fixed-point types and unsigned integer
573 without saturation, including:
574 unsigned integer to fractional,
575 fractional to unsigned integer.
576 NOTE: fractional can be either signed or unsigned for conversions. */
577 DEF_RTL_EXPR(UNSIGNED_FRACT_CONVERT, "unsigned_fract_convert", "e", RTX_UNARY)
579 /* Conversions involving fractional fixed-point types with saturation,
581 fractional to fractional (of different precision),
582 signed integer to fractional,
583 floating point to fractional.
584 NOTE: fractional can be either signed or unsigned for conversions. */
585 DEF_RTL_EXPR(SAT_FRACT, "sat_fract", "e", RTX_UNARY)
587 /* Conversions involving fractional fixed-point types and unsigned integer
588 with saturation, including:
589 unsigned integer to fractional.
590 NOTE: fractional can be either signed or unsigned for conversions. */
591 DEF_RTL_EXPR(UNSIGNED_SAT_FRACT, "unsigned_sat_fract", "e", RTX_UNARY)
594 DEF_RTL_EXPR(ABS, "abs", "e", RTX_UNARY)
597 DEF_RTL_EXPR(SQRT, "sqrt", "e", RTX_UNARY)
600 DEF_RTL_EXPR(BSWAP, "bswap", "e", RTX_UNARY)
602 /* Find first bit that is set.
603 Value is 1 + number of trailing zeros in the arg.,
605 DEF_RTL_EXPR(FFS, "ffs", "e", RTX_UNARY)
607 /* Count leading zeros. */
608 DEF_RTL_EXPR(CLZ, "clz", "e", RTX_UNARY)
610 /* Count trailing zeros. */
611 DEF_RTL_EXPR(CTZ, "ctz", "e", RTX_UNARY)
613 /* Population count (number of 1 bits). */
614 DEF_RTL_EXPR(POPCOUNT, "popcount", "e", RTX_UNARY)
616 /* Population parity (number of 1 bits modulo 2). */
617 DEF_RTL_EXPR(PARITY, "parity", "e", RTX_UNARY)
619 /* Reference to a signed bit-field of specified size and position.
620 Operand 0 is the memory unit (usually SImode or QImode) which
621 contains the field's first bit. Operand 1 is the width, in bits.
622 Operand 2 is the number of bits in the memory unit before the
623 first bit of this field.
624 If BITS_BIG_ENDIAN is defined, the first bit is the msb and
625 operand 2 counts from the msb of the memory unit.
626 Otherwise, the first bit is the lsb and operand 2 counts from
627 the lsb of the memory unit.
628 This kind of expression can not appear as an lvalue in RTL. */
629 DEF_RTL_EXPR(SIGN_EXTRACT, "sign_extract", "eee", RTX_BITFIELD_OPS)
631 /* Similar for unsigned bit-field.
632 But note! This kind of expression _can_ appear as an lvalue. */
633 DEF_RTL_EXPR(ZERO_EXTRACT, "zero_extract", "eee", RTX_BITFIELD_OPS)
635 /* For RISC machines. These save memory when splitting insns. */
637 /* HIGH are the high-order bits of a constant expression. */
638 DEF_RTL_EXPR(HIGH, "high", "e", RTX_CONST_OBJ)
640 /* LO_SUM is the sum of a register and the low-order bits
641 of a constant expression. */
642 DEF_RTL_EXPR(LO_SUM, "lo_sum", "ee", RTX_OBJ)
644 /* Describes a merge operation between two vector values.
645 Operands 0 and 1 are the vectors to be merged, operand 2 is a bitmask
646 that specifies where the parts of the result are taken from. Set bits
647 indicate operand 0, clear bits indicate operand 1. The parts are defined
648 by the mode of the vectors. */
649 DEF_RTL_EXPR(VEC_MERGE, "vec_merge", "eee", RTX_TERNARY)
651 /* Describes an operation that selects parts of a vector.
652 Operands 0 is the source vector, operand 1 is a PARALLEL that contains
653 a CONST_INT for each of the subparts of the result vector, giving the
654 number of the source subpart that should be stored into it. */
655 DEF_RTL_EXPR(VEC_SELECT, "vec_select", "ee", RTX_BIN_ARITH)
657 /* Describes a vector concat operation. Operands 0 and 1 are the source
658 vectors, the result is a vector that is as long as operands 0 and 1
659 combined and is the concatenation of the two source vectors. */
660 DEF_RTL_EXPR(VEC_CONCAT, "vec_concat", "ee", RTX_BIN_ARITH)
662 /* Describes an operation that converts a small vector into a larger one by
663 duplicating the input values. The output vector mode must have the same
664 submodes as the input vector mode, and the number of output parts must be
665 an integer multiple of the number of input parts. */
666 DEF_RTL_EXPR(VEC_DUPLICATE, "vec_duplicate", "e", RTX_UNARY)
668 /* Addition with signed saturation */
669 DEF_RTL_EXPR(SS_PLUS, "ss_plus", "ee", RTX_COMM_ARITH)
671 /* Addition with unsigned saturation */
672 DEF_RTL_EXPR(US_PLUS, "us_plus", "ee", RTX_COMM_ARITH)
674 /* Operand 0 minus operand 1, with signed saturation. */
675 DEF_RTL_EXPR(SS_MINUS, "ss_minus", "ee", RTX_BIN_ARITH)
677 /* Negation with signed saturation. */
678 DEF_RTL_EXPR(SS_NEG, "ss_neg", "e", RTX_UNARY)
679 /* Negation with unsigned saturation. */
680 DEF_RTL_EXPR(US_NEG, "us_neg", "e", RTX_UNARY)
682 /* Absolute value with signed saturation. */
683 DEF_RTL_EXPR(SS_ABS, "ss_abs", "e", RTX_UNARY)
685 /* Shift left with signed saturation. */
686 DEF_RTL_EXPR(SS_ASHIFT, "ss_ashift", "ee", RTX_BIN_ARITH)
688 /* Shift left with unsigned saturation. */
689 DEF_RTL_EXPR(US_ASHIFT, "us_ashift", "ee", RTX_BIN_ARITH)
691 /* Operand 0 minus operand 1, with unsigned saturation. */
692 DEF_RTL_EXPR(US_MINUS, "us_minus", "ee", RTX_BIN_ARITH)
694 /* Signed saturating truncate. */
695 DEF_RTL_EXPR(SS_TRUNCATE, "ss_truncate", "e", RTX_UNARY)
697 /* Unsigned saturating truncate. */
698 DEF_RTL_EXPR(US_TRUNCATE, "us_truncate", "e", RTX_UNARY)
700 /* Information about the variable and its location. */
701 /* Changed 'te' to 'tei'; the 'i' field is for recording
702 initialization status of variables. */
703 DEF_RTL_EXPR(VAR_LOCATION, "var_location", "tei", RTX_EXTRA)
705 /* All expressions from this point forward appear only in machine
707 #ifdef GENERATOR_FILE
709 /* Include a secondary machine-description file at this point. */
710 DEF_RTL_EXPR(INCLUDE, "include", "s", RTX_EXTRA)
712 /* Pattern-matching operators: */
714 /* Use the function named by the second arg (the string)
715 as a predicate; if matched, store the structure that was matched
716 in the operand table at index specified by the first arg (the integer).
717 If the second arg is the null string, the structure is just stored.
719 A third string argument indicates to the register allocator restrictions
720 on where the operand can be allocated.
722 If the target needs no restriction on any instruction this field should
725 The string is prepended by:
726 '=' to indicate the operand is only written to.
727 '+' to indicate the operand is both read and written to.
729 Each character in the string represents an allocable class for an operand.
730 'g' indicates the operand can be any valid class.
731 'i' indicates the operand can be immediate (in the instruction) data.
732 'r' indicates the operand can be in a register.
733 'm' indicates the operand can be in memory.
734 'o' a subset of the 'm' class. Those memory addressing modes that
735 can be offset at compile time (have a constant added to them).
737 Other characters indicate target dependent operand classes and
738 are described in each target's machine description.
740 For instructions with more than one operand, sets of classes can be
741 separated by a comma to indicate the appropriate multi-operand constraints.
742 There must be a 1 to 1 correspondence between these sets of classes in
743 all operands for an instruction.
745 DEF_RTL_EXPR(MATCH_OPERAND, "match_operand", "iss", RTX_MATCH)
747 /* Match a SCRATCH or a register. When used to generate rtl, a
748 SCRATCH is generated. As for MATCH_OPERAND, the mode specifies
749 the desired mode and the first argument is the operand number.
750 The second argument is the constraint. */
751 DEF_RTL_EXPR(MATCH_SCRATCH, "match_scratch", "is", RTX_MATCH)
753 /* Apply a predicate, AND match recursively the operands of the rtx.
754 Operand 0 is the operand-number, as in match_operand.
755 Operand 1 is a predicate to apply (as a string, a function name).
756 Operand 2 is a vector of expressions, each of which must match
757 one subexpression of the rtx this construct is matching. */
758 DEF_RTL_EXPR(MATCH_OPERATOR, "match_operator", "isE", RTX_MATCH)
760 /* Match a PARALLEL of arbitrary length. The predicate is applied
761 to the PARALLEL and the initial expressions in the PARALLEL are matched.
762 Operand 0 is the operand-number, as in match_operand.
763 Operand 1 is a predicate to apply to the PARALLEL.
764 Operand 2 is a vector of expressions, each of which must match the
765 corresponding element in the PARALLEL. */
766 DEF_RTL_EXPR(MATCH_PARALLEL, "match_parallel", "isE", RTX_MATCH)
768 /* Match only something equal to what is stored in the operand table
769 at the index specified by the argument. Use with MATCH_OPERAND. */
770 DEF_RTL_EXPR(MATCH_DUP, "match_dup", "i", RTX_MATCH)
772 /* Match only something equal to what is stored in the operand table
773 at the index specified by the argument. Use with MATCH_OPERATOR. */
774 DEF_RTL_EXPR(MATCH_OP_DUP, "match_op_dup", "iE", RTX_MATCH)
776 /* Match only something equal to what is stored in the operand table
777 at the index specified by the argument. Use with MATCH_PARALLEL. */
778 DEF_RTL_EXPR(MATCH_PAR_DUP, "match_par_dup", "iE", RTX_MATCH)
780 /* Appears only in define_predicate/define_special_predicate
781 expressions. Evaluates true only if the operand has an RTX code
782 from the set given by the argument (a comma-separated list). If the
783 second argument is present and nonempty, it is a sequence of digits
784 and/or letters which indicates the subexpression to test, using the
785 same syntax as genextract/genrecog's location strings: 0-9 for
786 XEXP (op, n), a-z for XVECEXP (op, 0, n); each character applies to
787 the result of the one before it. */
788 DEF_RTL_EXPR(MATCH_CODE, "match_code", "ss", RTX_MATCH)
790 /* Appears only in define_predicate/define_special_predicate
791 expressions. The argument is a C expression to be injected at this
792 point in the predicate formula. */
793 DEF_RTL_EXPR(MATCH_TEST, "match_test", "s", RTX_MATCH)
795 /* Insn (and related) definitions. */
797 /* Definition of the pattern for one kind of instruction.
799 0: names this instruction.
800 If the name is the null string, the instruction is in the
801 machine description just to be recognized, and will never be emitted by
802 the tree to rtl expander.
804 2: is a string which is a C expression
805 giving an additional condition for recognizing this pattern.
806 A null string means no extra condition.
807 3: is the action to execute if this pattern is matched.
808 If this assembler code template starts with a * then it is a fragment of
809 C code to run to decide on a template to use. Otherwise, it is the
811 4: optionally, a vector of attributes for this insn.
813 DEF_RTL_EXPR(DEFINE_INSN, "define_insn", "sEsTV", RTX_EXTRA)
815 /* Definition of a peephole optimization.
816 1st operand: vector of insn patterns to match
817 2nd operand: C expression that must be true
818 3rd operand: template or C code to produce assembler output.
819 4: optionally, a vector of attributes for this insn.
821 This form is deprecated; use define_peephole2 instead. */
822 DEF_RTL_EXPR(DEFINE_PEEPHOLE, "define_peephole", "EsTV", RTX_EXTRA)
824 /* Definition of a split operation.
825 1st operand: insn pattern to match
826 2nd operand: C expression that must be true
827 3rd operand: vector of insn patterns to place into a SEQUENCE
828 4th operand: optionally, some C code to execute before generating the
829 insns. This might, for example, create some RTX's and store them in
830 elements of `recog_data.operand' for use by the vector of
832 (`operands' is an alias here for `recog_data.operand'). */
833 DEF_RTL_EXPR(DEFINE_SPLIT, "define_split", "EsES", RTX_EXTRA)
835 /* Definition of an insn and associated split.
836 This is the concatenation, with a few modifications, of a define_insn
837 and a define_split which share the same pattern.
839 0: names this instruction.
840 If the name is the null string, the instruction is in the
841 machine description just to be recognized, and will never be emitted by
842 the tree to rtl expander.
844 2: is a string which is a C expression
845 giving an additional condition for recognizing this pattern.
846 A null string means no extra condition.
847 3: is the action to execute if this pattern is matched.
848 If this assembler code template starts with a * then it is a fragment of
849 C code to run to decide on a template to use. Otherwise, it is the
851 4: C expression that must be true for split. This may start with "&&"
852 in which case the split condition is the logical and of the insn
853 condition and what follows the "&&" of this operand.
854 5: vector of insn patterns to place into a SEQUENCE
855 6: optionally, some C code to execute before generating the
856 insns. 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 7: optionally, a vector of attributes for this insn. */
861 DEF_RTL_EXPR(DEFINE_INSN_AND_SPLIT, "define_insn_and_split", "sEsTsESV", RTX_EXTRA)
863 /* Definition of an RTL peephole operation.
864 Follows the same arguments as define_split. */
865 DEF_RTL_EXPR(DEFINE_PEEPHOLE2, "define_peephole2", "EsES", RTX_EXTRA)
867 /* Define how to generate multiple insns for a standard insn name.
868 1st operand: the insn name.
869 2nd operand: vector of insn-patterns.
870 Use match_operand to substitute an element of `recog_data.operand'.
871 3rd operand: C expression that must be true for this to be available.
872 This may not test any operands.
873 4th operand: Extra C code to execute before generating the insns.
874 This might, for example, create some RTX's and store them in
875 elements of `recog_data.operand' for use by the vector of
877 (`operands' is an alias here for `recog_data.operand'). */
878 DEF_RTL_EXPR(DEFINE_EXPAND, "define_expand", "sEss", RTX_EXTRA)
880 /* Define a requirement for delay slots.
881 1st operand: Condition involving insn attributes that, if true,
882 indicates that the insn requires the number of delay slots
884 2nd operand: Vector whose length is the three times the number of delay
886 Each entry gives three conditions, each involving attributes.
887 The first must be true for an insn to occupy that delay slot
888 location. The second is true for all insns that can be
889 annulled if the branch is true and the third is true for all
890 insns that can be annulled if the branch is false.
892 Multiple DEFINE_DELAYs may be present. They indicate differing
893 requirements for delay slots. */
894 DEF_RTL_EXPR(DEFINE_DELAY, "define_delay", "eE", RTX_EXTRA)
896 /* Define attribute computation for `asm' instructions. */
897 DEF_RTL_EXPR(DEFINE_ASM_ATTRIBUTES, "define_asm_attributes", "V", RTX_EXTRA)
899 /* Definition of a conditional execution meta operation. Automatically
900 generates new instances of DEFINE_INSN, selected by having attribute
901 "predicable" true. The new pattern will contain a COND_EXEC and the
902 predicate at top-level.
905 0: The predicate pattern. The top-level form should match a
906 relational operator. Operands should have only one alternative.
907 1: A C expression giving an additional condition for recognizing
908 the generated pattern.
909 2: A template or C code to produce assembler output. */
910 DEF_RTL_EXPR(DEFINE_COND_EXEC, "define_cond_exec", "Ess", RTX_EXTRA)
912 /* Definition of an operand predicate. The difference between
913 DEFINE_PREDICATE and DEFINE_SPECIAL_PREDICATE is that genrecog will
914 not warn about a match_operand with no mode if it has a predicate
915 defined with DEFINE_SPECIAL_PREDICATE.
918 0: The name of the predicate.
919 1: A boolean expression which computes whether or not the predicate
920 matches. This expression can use IOR, AND, NOT, MATCH_OPERAND,
921 MATCH_CODE, and MATCH_TEST. It must be specific enough that genrecog
922 can calculate the set of RTX codes that can possibly match.
923 2: A C function body which must return true for the predicate to match.
924 Optional. Use this when the test is too complicated to fit into a
925 match_test expression. */
926 DEF_RTL_EXPR(DEFINE_PREDICATE, "define_predicate", "ses", RTX_EXTRA)
927 DEF_RTL_EXPR(DEFINE_SPECIAL_PREDICATE, "define_special_predicate", "ses", RTX_EXTRA)
929 /* Definition of a register operand constraint. This simply maps the
930 constraint string to a register class.
933 0: The name of the constraint (often, but not always, a single letter).
934 1: A C expression which evaluates to the appropriate register class for
935 this constraint. If this is not just a constant, it should look only
936 at -m switches and the like.
937 2: A docstring for this constraint, in Texinfo syntax; not currently
938 used, in future will be incorporated into the manual's list of
939 machine-specific operand constraints. */
940 DEF_RTL_EXPR(DEFINE_REGISTER_CONSTRAINT, "define_register_constraint", "sss", RTX_EXTRA)
942 /* Definition of a non-register operand constraint. These look at the
943 operand and decide whether it fits the constraint.
945 DEFINE_CONSTRAINT gets no special treatment if it fails to match.
946 It is appropriate for constant-only constraints, and most others.
948 DEFINE_MEMORY_CONSTRAINT tells reload that this constraint can be made
949 to match, if it doesn't already, by converting the operand to the form
950 (mem (reg X)) where X is a base register. It is suitable for constraints
951 that describe a subset of all memory references.
953 DEFINE_ADDRESS_CONSTRAINT tells reload that this constraint can be made
954 to match, if it doesn't already, by converting the operand to the form
955 (reg X) where X is a base register. It is suitable for constraints that
956 describe a subset of all address references.
958 When in doubt, use plain DEFINE_CONSTRAINT.
961 0: The name of the constraint (often, but not always, a single letter).
962 1: A docstring for this constraint, in Texinfo syntax; not currently
963 used, in future will be incorporated into the manual's list of
964 machine-specific operand constraints.
965 2: A boolean expression which computes whether or not the constraint
966 matches. It should follow the same rules as a define_predicate
967 expression, including the bit about specifying the set of RTX codes
968 that could possibly match. MATCH_TEST subexpressions may make use of
970 `op' - the RTL object defining the operand.
971 `mode' - the mode of `op'.
972 `ival' - INTVAL(op), if op is a CONST_INT.
973 `hval' - CONST_DOUBLE_HIGH(op), if op is an integer CONST_DOUBLE.
974 `lval' - CONST_DOUBLE_LOW(op), if op is an integer CONST_DOUBLE.
975 `rval' - CONST_DOUBLE_REAL_VALUE(op), if op is a floating-point
977 Do not use ival/hval/lval/rval if op is not the appropriate kind of
979 DEF_RTL_EXPR(DEFINE_CONSTRAINT, "define_constraint", "sse", RTX_EXTRA)
980 DEF_RTL_EXPR(DEFINE_MEMORY_CONSTRAINT, "define_memory_constraint", "sse", RTX_EXTRA)
981 DEF_RTL_EXPR(DEFINE_ADDRESS_CONSTRAINT, "define_address_constraint", "sse", RTX_EXTRA)
984 /* Constructions for CPU pipeline description described by NDFAs. */
986 /* (define_cpu_unit string [string]) describes cpu functional
987 units (separated by comma).
989 1st operand: Names of cpu functional units.
990 2nd operand: Name of automaton (see comments for DEFINE_AUTOMATON).
992 All define_reservations, define_cpu_units, and
993 define_query_cpu_units should have unique names which may not be
995 DEF_RTL_EXPR(DEFINE_CPU_UNIT, "define_cpu_unit", "sS", RTX_EXTRA)
997 /* (define_query_cpu_unit string [string]) describes cpu functional
998 units analogously to define_cpu_unit. The reservation of such
999 units can be queried for automaton state. */
1000 DEF_RTL_EXPR(DEFINE_QUERY_CPU_UNIT, "define_query_cpu_unit", "sS", RTX_EXTRA)
1002 /* (exclusion_set string string) means that each CPU functional unit
1003 in the first string can not be reserved simultaneously with any
1004 unit whose name is in the second string and vise versa. CPU units
1005 in the string are separated by commas. For example, it is useful
1006 for description CPU with fully pipelined floating point functional
1007 unit which can execute simultaneously only single floating point
1008 insns or only double floating point insns. All CPU functional
1009 units in a set should belong to the same automaton. */
1010 DEF_RTL_EXPR(EXCLUSION_SET, "exclusion_set", "ss", RTX_EXTRA)
1012 /* (presence_set string string) means that each CPU functional unit in
1013 the first string can not be reserved unless at least one of pattern
1014 of units whose names are in the second string is reserved. This is
1015 an asymmetric relation. CPU units or unit patterns in the strings
1016 are separated by commas. Pattern is one unit name or unit names
1017 separated by white-spaces.
1019 For example, it is useful for description that slot1 is reserved
1020 after slot0 reservation for a VLIW processor. We could describe it
1021 by the following construction
1023 (presence_set "slot1" "slot0")
1025 Or slot1 is reserved only after slot0 and unit b0 reservation. In
1026 this case we could write
1028 (presence_set "slot1" "slot0 b0")
1030 All CPU functional units in a set should belong to the same
1032 DEF_RTL_EXPR(PRESENCE_SET, "presence_set", "ss", RTX_EXTRA)
1034 /* (final_presence_set string string) is analogous to `presence_set'.
1035 The difference between them is when checking is done. When an
1036 instruction is issued in given automaton state reflecting all
1037 current and planned unit reservations, the automaton state is
1038 changed. The first state is a source state, the second one is a
1039 result state. Checking for `presence_set' is done on the source
1040 state reservation, checking for `final_presence_set' is done on the
1041 result reservation. This construction is useful to describe a
1042 reservation which is actually two subsequent reservations. For
1045 (presence_set "slot1" "slot0")
1047 the following insn will be never issued (because slot1 requires
1048 slot0 which is absent in the source state).
1050 (define_reservation "insn_and_nop" "slot0 + slot1")
1052 but it can be issued if we use analogous `final_presence_set'. */
1053 DEF_RTL_EXPR(FINAL_PRESENCE_SET, "final_presence_set", "ss", RTX_EXTRA)
1055 /* (absence_set string string) means that each CPU functional unit in
1056 the first string can be reserved only if each pattern of units
1057 whose names are in the second string is not reserved. This is an
1058 asymmetric relation (actually exclusion set is analogous to this
1059 one but it is symmetric). CPU units or unit patterns in the string
1060 are separated by commas. Pattern is one unit name or unit names
1061 separated by white-spaces.
1063 For example, it is useful for description that slot0 can not be
1064 reserved after slot1 or slot2 reservation for a VLIW processor. We
1065 could describe it by the following construction
1067 (absence_set "slot2" "slot0, slot1")
1069 Or slot2 can not be reserved if slot0 and unit b0 are reserved or
1070 slot1 and unit b1 are reserved . In this case we could write
1072 (absence_set "slot2" "slot0 b0, slot1 b1")
1074 All CPU functional units in a set should to belong the same
1076 DEF_RTL_EXPR(ABSENCE_SET, "absence_set", "ss", RTX_EXTRA)
1078 /* (final_absence_set string string) is analogous to `absence_set' but
1079 checking is done on the result (state) reservation. See comments
1080 for `final_presence_set'. */
1081 DEF_RTL_EXPR(FINAL_ABSENCE_SET, "final_absence_set", "ss", RTX_EXTRA)
1083 /* (define_bypass number out_insn_names in_insn_names) names bypass
1084 with given latency (the first number) from insns given by the first
1085 string (see define_insn_reservation) into insns given by the second
1086 string. Insn names in the strings are separated by commas. The
1087 third operand is optional name of function which is additional
1088 guard for the bypass. The function will get the two insns as
1089 parameters. If the function returns zero the bypass will be
1090 ignored for this case. Additional guard is necessary to recognize
1091 complicated bypasses, e.g. when consumer is load address. If there
1092 are more one bypass with the same output and input insns, the
1093 chosen bypass is the first bypass with a guard in description whose
1094 guard function returns nonzero. If there is no such bypass, then
1095 bypass without the guard function is chosen. */
1096 DEF_RTL_EXPR(DEFINE_BYPASS, "define_bypass", "issS", RTX_EXTRA)
1098 /* (define_automaton string) describes names of automata generated and
1099 used for pipeline hazards recognition. The names are separated by
1100 comma. Actually it is possibly to generate the single automaton
1101 but unfortunately it can be very large. If we use more one
1102 automata, the summary size of the automata usually is less than the
1103 single one. The automaton name is used in define_cpu_unit and
1104 define_query_cpu_unit. All automata should have unique names. */
1105 DEF_RTL_EXPR(DEFINE_AUTOMATON, "define_automaton", "s", RTX_EXTRA)
1107 /* (automata_option string) describes option for generation of
1108 automata. Currently there are the following options:
1110 o "no-minimization" which makes no minimization of automata. This
1111 is only worth to do when we are debugging the description and
1112 need to look more accurately at reservations of states.
1114 o "time" which means printing additional time statistics about
1115 generation of automata.
1117 o "v" which means generation of file describing the result
1118 automata. The file has suffix `.dfa' and can be used for the
1119 description verification and debugging.
1121 o "w" which means generation of warning instead of error for
1122 non-critical errors.
1124 o "ndfa" which makes nondeterministic finite state automata.
1126 o "progress" which means output of a progress bar showing how many
1127 states were generated so far for automaton being processed. */
1128 DEF_RTL_EXPR(AUTOMATA_OPTION, "automata_option", "s", RTX_EXTRA)
1130 /* (define_reservation string string) names reservation (the first
1131 string) of cpu functional units (the 2nd string). Sometimes unit
1132 reservations for different insns contain common parts. In such
1133 case, you can describe common part and use its name (the 1st
1134 parameter) in regular expression in define_insn_reservation. All
1135 define_reservations, define_cpu_units, and define_query_cpu_units
1136 should have unique names which may not be "nothing". */
1137 DEF_RTL_EXPR(DEFINE_RESERVATION, "define_reservation", "ss", RTX_EXTRA)
1139 /* (define_insn_reservation name default_latency condition regexpr)
1140 describes reservation of cpu functional units (the 3nd operand) for
1141 instruction which is selected by the condition (the 2nd parameter).
1142 The first parameter is used for output of debugging information.
1143 The reservations are described by a regular expression according
1144 the following syntax:
1146 regexp = regexp "," oneof
1149 oneof = oneof "|" allof
1152 allof = allof "+" repeat
1155 repeat = element "*" number
1158 element = cpu_function_unit_name
1164 1. "," is used for describing start of the next cycle in
1167 2. "|" is used for describing the reservation described by the
1168 first regular expression *or* the reservation described by the
1169 second regular expression *or* etc.
1171 3. "+" is used for describing the reservation described by the
1172 first regular expression *and* the reservation described by the
1173 second regular expression *and* etc.
1175 4. "*" is used for convenience and simply means sequence in
1176 which the regular expression are repeated NUMBER times with
1177 cycle advancing (see ",").
1179 5. cpu functional unit name which means its reservation.
1181 6. reservation name -- see define_reservation.
1183 7. string "nothing" means no units reservation. */
1185 DEF_RTL_EXPR(DEFINE_INSN_RESERVATION, "define_insn_reservation", "sies", RTX_EXTRA)
1187 /* Expressions used for insn attributes. */
1189 /* Definition of an insn attribute.
1190 1st operand: name of the attribute
1191 2nd operand: comma-separated list of possible attribute values
1192 3rd operand: expression for the default value of the attribute. */
1193 DEF_RTL_EXPR(DEFINE_ATTR, "define_attr", "sse", RTX_EXTRA)
1195 /* Marker for the name of an attribute. */
1196 DEF_RTL_EXPR(ATTR, "attr", "s", RTX_EXTRA)
1198 /* For use in the last (optional) operand of DEFINE_INSN or DEFINE_PEEPHOLE and
1199 in DEFINE_ASM_INSN to specify an attribute to assign to insns matching that
1202 (set_attr "name" "value") is equivalent to
1203 (set (attr "name") (const_string "value")) */
1204 DEF_RTL_EXPR(SET_ATTR, "set_attr", "ss", RTX_EXTRA)
1206 /* In the last operand of DEFINE_INSN and DEFINE_PEEPHOLE, this can be used to
1207 specify that attribute values are to be assigned according to the
1208 alternative matched.
1210 The following three expressions are equivalent:
1212 (set (attr "att") (cond [(eq_attrq "alternative" "1") (const_string "a1")
1213 (eq_attrq "alternative" "2") (const_string "a2")]
1214 (const_string "a3")))
1215 (set_attr_alternative "att" [(const_string "a1") (const_string "a2")
1216 (const_string "a3")])
1217 (set_attr "att" "a1,a2,a3")
1219 DEF_RTL_EXPR(SET_ATTR_ALTERNATIVE, "set_attr_alternative", "sE", RTX_EXTRA)
1221 /* A conditional expression true if the value of the specified attribute of
1222 the current insn equals the specified value. The first operand is the
1223 attribute name and the second is the comparison value. */
1224 DEF_RTL_EXPR(EQ_ATTR, "eq_attr", "ss", RTX_EXTRA)
1226 /* A special case of the above representing a set of alternatives. The first
1227 operand is bitmap of the set, the second one is the default value. */
1228 DEF_RTL_EXPR(EQ_ATTR_ALT, "eq_attr_alt", "ii", RTX_EXTRA)
1230 /* A conditional expression which is true if the specified flag is
1231 true for the insn being scheduled in reorg.
1233 genattr.c defines the following flags which can be tested by
1234 (attr_flag "foo") expressions in eligible_for_delay.
1236 forward, backward, very_likely, likely, very_unlikely, and unlikely. */
1238 DEF_RTL_EXPR (ATTR_FLAG, "attr_flag", "s", RTX_EXTRA)
1240 /* General conditional. The first operand is a vector composed of pairs of
1241 expressions. The first element of each pair is evaluated, in turn.
1242 The value of the conditional is the second expression of the first pair
1243 whose first expression evaluates nonzero. If none of the expressions is
1244 true, the second operand will be used as the value of the conditional. */
1245 DEF_RTL_EXPR(COND, "cond", "Ee", RTX_EXTRA)
1247 #endif /* GENERATOR_FILE */
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