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1.1 root 1: /* Definitions for code generation pass of GNU compiler.
2: Copyright (C) 1987, 1991 Free Software Foundation, Inc.
3:
4: This file is part of GNU CC.
5:
6: GNU CC is free software; you can redistribute it and/or modify
7: it under the terms of the GNU General Public License as published by
8: the Free Software Foundation; either version 2, or (at your option)
9: any later version.
10:
11: GNU CC is distributed in the hope that it will be useful,
12: but WITHOUT ANY WARRANTY; without even the implied warranty of
13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: GNU General Public License for more details.
15:
16: You should have received a copy of the GNU General Public License
17: along with GNU CC; see the file COPYING. If not, write to
18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
19:
20:
21: #ifndef __STDC__
22: #ifndef const
23: #define const
24: #endif
25: #endif
26:
27: /* The default branch cost is 1. */
28: #ifndef BRANCH_COST
29: #define BRANCH_COST 1
30: #endif
31:
1.1.1.4 ! root 32: /* The default is that we do not promote the mode of an object. */
! 33: #ifndef PROMOTE_MODE
! 34: #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)
! 35: #endif
! 36:
1.1 root 37: /* Macros to access the slots of a QUEUED rtx.
38: Here rather than in rtl.h because only the expansion pass
39: should ever encounter a QUEUED. */
40:
41: /* The variable for which an increment is queued. */
42: #define QUEUED_VAR(P) XEXP (P, 0)
43: /* If the increment has been emitted, this is the insn
44: that does the increment. It is zero before the increment is emitted. */
45: #define QUEUED_INSN(P) XEXP (P, 1)
46: /* If a pre-increment copy has been generated, this is the copy
47: (it is a temporary reg). Zero if no copy made yet. */
48: #define QUEUED_COPY(P) XEXP (P, 2)
49: /* This is the body to use for the insn to do the increment.
50: It is used to emit the increment. */
51: #define QUEUED_BODY(P) XEXP (P, 3)
52: /* Next QUEUED in the queue. */
53: #define QUEUED_NEXT(P) XEXP (P, 4)
54:
55: /* This is the 4th arg to `expand_expr'.
56: EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
57: EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
58: EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
59: is a constant that is not a legitimate address. */
60: enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
61: EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER};
62:
63: /* List of labels that must never be deleted. */
64: extern rtx forced_labels;
65:
66: /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
67: So we can mark them all live at the end of the function, if stupid. */
68: extern rtx save_expr_regs;
69:
70: extern int current_function_calls_alloca;
71: extern int current_function_outgoing_args_size;
72:
73: /* This is the offset from the arg pointer to the place where the first
74: anonymous arg can be found, if there is one. */
75: extern rtx current_function_arg_offset_rtx;
76:
77: /* This is nonzero if the current function uses the constant pool. */
78: extern int current_function_uses_const_pool;
79:
80: /* This is nonzero if the current function uses pic_offset_table_rtx. */
81: extern int current_function_uses_pic_offset_table;
82:
83: /* The arg pointer hard register, or the pseudo into which it was copied. */
84: extern rtx current_function_internal_arg_pointer;
85:
86: /* Nonzero means stack pops must not be deferred, and deferred stack
87: pops must not be output. It is nonzero inside a function call,
88: inside a conditional expression, inside a statement expression,
89: and in other cases as well. */
90: extern int inhibit_defer_pop;
91:
92: /* Number of function calls seen so far in current function. */
93:
94: extern int function_call_count;
95:
96: /* RTX for stack slot that holds the current handler for nonlocal gotos.
97: Zero when function does not have nonlocal labels. */
98:
99: extern rtx nonlocal_goto_handler_slot;
100:
101: /* RTX for stack slot that holds the stack pointer value to restore
102: for a nonlocal goto.
103: Zero when function does not have nonlocal labels. */
104:
105: extern rtx nonlocal_goto_stack_level;
106:
107: /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
108: (labels to which there can be nonlocal gotos from nested functions)
109: in this function. */
110:
111: #ifdef TREE_CODE /* Don't lose if tree.h not included. */
112: extern tree nonlocal_labels;
113: #endif
114:
115: #define NO_DEFER_POP (inhibit_defer_pop += 1)
116: #define OK_DEFER_POP (inhibit_defer_pop -= 1)
117:
118: /* Number of units that we should eventually pop off the stack.
119: These are the arguments to function calls that have already returned. */
120: extern int pending_stack_adjust;
121:
122: /* A list of all cleanups which belong to the arguments of
123: function calls being expanded by expand_call. */
124: #ifdef TREE_CODE /* Don't lose if tree.h not included. */
125: extern tree cleanups_this_call;
126: #endif
127:
128: #ifdef TREE_CODE /* Don't lose if tree.h not included. */
129: /* Structure to record the size of a sequence of arguments
130: as the sum of a tree-expression and a constant. */
131:
132: struct args_size
133: {
134: int constant;
135: tree var;
136: };
137: #endif
138:
139: /* Add the value of the tree INC to the `struct args_size' TO. */
140:
141: #define ADD_PARM_SIZE(TO, INC) \
142: { tree inc = (INC); \
143: if (TREE_CODE (inc) == INTEGER_CST) \
144: (TO).constant += TREE_INT_CST_LOW (inc); \
145: else if ((TO).var == 0) \
146: (TO).var = inc; \
147: else \
148: (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
149:
150: #define SUB_PARM_SIZE(TO, DEC) \
151: { tree dec = (DEC); \
152: if (TREE_CODE (dec) == INTEGER_CST) \
153: (TO).constant -= TREE_INT_CST_LOW (dec); \
154: else if ((TO).var == 0) \
155: (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
156: else \
157: (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
158:
159: /* Convert the implicit sum in a `struct args_size' into an rtx. */
160: #define ARGS_SIZE_RTX(SIZE) \
1.1.1.4 ! root 161: ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
1.1 root 162: : expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
163: size_int ((SIZE).constant)), \
1.1.1.4 ! root 164: NULL_RTX, VOIDmode, 0))
1.1 root 165:
166: /* Convert the implicit sum in a `struct args_size' into a tree. */
167: #define ARGS_SIZE_TREE(SIZE) \
168: ((SIZE).var == 0 ? size_int ((SIZE).constant) \
169: : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
170:
171: /* Supply a default definition for FUNCTION_ARG_PADDING:
1.1.1.4 ! root 172: usually pad upward, but pad short args downward on
1.1 root 173: big-endian machines. */
174:
175: enum direction {none, upward, downward}; /* Value has this type. */
176:
177: #ifndef FUNCTION_ARG_PADDING
178: #if BYTES_BIG_ENDIAN
179: #define FUNCTION_ARG_PADDING(MODE, TYPE) \
180: (((MODE) == BLKmode \
181: ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
182: && int_size_in_bytes (TYPE) < PARM_BOUNDARY / BITS_PER_UNIT) \
183: : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
184: ? downward : upward)
185: #else
186: #define FUNCTION_ARG_PADDING(MODE, TYPE) upward
187: #endif
188: #endif
189:
190: /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
191: FUNCTION_ARG_PADDING, which also pads the length, handle any needed
192: alignment. */
193:
194: #ifndef FUNCTION_ARG_BOUNDARY
195: #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
196: #endif
197:
198: /* Nonzero if we do not know how to pass TYPE solely in registers.
199: We cannot do so in the following cases:
200:
201: - if the type has variable size
202: - if the type is marked as addressable (it is required to be constructed
203: into the stack)
204: - if the padding and mode of the type is such that a copy into a register
205: would put it into the wrong part of the register
206: - when STRICT_ALIGNMENT and the type is BLKmode and is is not
207: aligned to a boundary corresponding to what can be loaded into a
208: register. */
209:
210: #define MUST_PASS_IN_STACK_BAD_ALIGN(MODE,TYPE) \
1.1.1.2 root 211: (STRICT_ALIGNMENT && MODE == BLKmode \
1.1 root 212: && TYPE_ALIGN (TYPE) < (BIGGEST_ALIGNMENT < BITS_PER_WORD \
213: ? BIGGEST_ALIGNMENT : BITS_PER_WORD))
214:
215: /* Which padding can't be supported depends on the byte endianness. */
216:
217: /* A value in a register is implicitly padded at the most significant end.
218: On a big-endian machine, that is the lower end in memory.
219: So a value padded in memory at the upper end can't go in a register.
220: For a little-endian machine, the reverse is true. */
221:
222: #if BYTES_BIG_ENDIAN
223: #define MUST_PASS_IN_STACK_BAD_PADDING upward
224: #else
225: #define MUST_PASS_IN_STACK_BAD_PADDING downward
226: #endif
227:
228: #define MUST_PASS_IN_STACK(MODE,TYPE) \
229: ((TYPE) != 0 \
230: && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
231: || TREE_ADDRESSABLE (TYPE) \
232: || ((MODE) == BLKmode \
233: && (FUNCTION_ARG_PADDING (MODE, TYPE) \
234: == MUST_PASS_IN_STACK_BAD_PADDING)) \
235: || MUST_PASS_IN_STACK_BAD_ALIGN (MODE, TYPE)))
236:
237: /* Nonzero if type TYPE should be returned in memory
238: (even though its mode is not BLKmode).
239: Most machines can use the following default definition. */
240:
241: #ifndef RETURN_IN_MEMORY
242: #define RETURN_IN_MEMORY(TYPE) 0
243: #endif
244:
245: /* Optabs are tables saying how to generate insn bodies
246: for various machine modes and numbers of operands.
247: Each optab applies to one operation.
248: For example, add_optab applies to addition.
249:
250: The insn_code slot is the enum insn_code that says how to
251: generate an insn for this operation on a particular machine mode.
252: It is CODE_FOR_nothing if there is no such insn on the target machine.
253:
254: The `lib_call' slot is the name of the library function that
255: can be used to perform the operation.
256:
257: A few optabs, such as move_optab and cmp_optab, are used
258: by special code. */
259:
260: /* Everything that uses expr.h needs to define enum insn_code
261: but we don't list it in the Makefile dependencies just for that. */
262: #include "insn-codes.h"
263:
264: typedef struct optab
265: {
266: enum rtx_code code;
267: struct {
268: enum insn_code insn_code;
269: rtx libfunc;
270: } handlers [NUM_MACHINE_MODES];
271: } * optab;
272:
273: /* Given an enum insn_code, access the function to construct
274: the body of that kind of insn. */
275: #ifdef FUNCTION_CONVERSION_BUG
276: /* Some compilers fail to convert a function properly to a
277: pointer-to-function when used as an argument.
278: So produce the pointer-to-function directly.
279: Luckily, these compilers seem to work properly when you
280: call the pointer-to-function. */
281: #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
282: #else
283: #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
284: #endif
285:
286: extern rtx (*const insn_gen_function[]) ();
287:
288: extern optab add_optab;
289: extern optab sub_optab;
1.1.1.3 root 290: extern optab smul_optab; /* Signed and floating-point multiply */
1.1 root 291: extern optab smul_widen_optab; /* Signed multiply with result
292: one machine mode wider than args */
293: extern optab umul_widen_optab;
294: extern optab sdiv_optab; /* Signed divide */
295: extern optab sdivmod_optab; /* Signed divide-and-remainder in one */
296: extern optab udiv_optab;
297: extern optab udivmod_optab;
298: extern optab smod_optab; /* Signed remainder */
299: extern optab umod_optab;
300: extern optab flodiv_optab; /* Optab for floating divide. */
301: extern optab ftrunc_optab; /* Convert float to integer in float fmt */
302: extern optab and_optab; /* Logical and */
303: extern optab ior_optab; /* Logical or */
304: extern optab xor_optab; /* Logical xor */
305: extern optab ashl_optab; /* Arithmetic shift left */
306: extern optab ashr_optab; /* Arithmetic shift right */
307: extern optab lshl_optab; /* Logical shift left */
308: extern optab lshr_optab; /* Logical shift right */
309: extern optab rotl_optab; /* Rotate left */
310: extern optab rotr_optab; /* Rotate right */
1.1.1.3 root 311: extern optab smin_optab; /* Signed and floating-point minimum value */
312: extern optab smax_optab; /* Signed and floating-point maximum value */
1.1 root 313: extern optab umin_optab; /* Unsigned minimum value */
314: extern optab umax_optab; /* Unsigned maximum value */
315:
316: extern optab mov_optab; /* Move instruction. */
317: extern optab movstrict_optab; /* Move, preserving high part of register. */
318:
319: extern optab cmp_optab; /* Compare insn; two operands. */
320: extern optab tst_optab; /* tst insn; compare one operand against 0 */
321:
322: /* Unary operations */
323: extern optab neg_optab; /* Negation */
324: extern optab abs_optab; /* Abs value */
325: extern optab one_cmpl_optab; /* Bitwise not */
326: extern optab ffs_optab; /* Find first bit set */
1.1.1.2 root 327: extern optab sqrt_optab; /* Square root */
1.1.1.4 ! root 328: extern optab sin_optab; /* Sine */
! 329: extern optab cos_optab; /* Cosine */
1.1.1.3 root 330: extern optab strlen_optab; /* String length */
1.1 root 331:
332: /* Passed to expand_binop and expand_unop to say which options to try to use
333: if the requested operation can't be open-coded on the requisite mode.
334: Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
335: Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
336: OPTAB_MUST_WIDEN says try widening and don't try anything else. */
337:
338: enum optab_methods
339: {
340: OPTAB_DIRECT,
341: OPTAB_LIB,
342: OPTAB_WIDEN,
343: OPTAB_LIB_WIDEN,
344: OPTAB_MUST_WIDEN
345: };
346:
347: /* SYMBOL_REF rtx's for the library functions that are called
348: implicitly and not via optabs. */
349:
350: extern rtx extendsfdf2_libfunc;
1.1.1.4 ! root 351: extern rtx extendsfxf2_libfunc;
! 352: extern rtx extendsftf2_libfunc;
! 353: extern rtx extenddfxf2_libfunc;
! 354: extern rtx extenddftf2_libfunc;
! 355:
1.1 root 356: extern rtx truncdfsf2_libfunc;
1.1.1.4 ! root 357: extern rtx truncxfsf2_libfunc;
! 358: extern rtx trunctfsf2_libfunc;
! 359: extern rtx truncxfdf2_libfunc;
! 360: extern rtx trunctfdf2_libfunc;
! 361:
1.1 root 362: extern rtx memcpy_libfunc;
363: extern rtx bcopy_libfunc;
364: extern rtx memcmp_libfunc;
365: extern rtx bcmp_libfunc;
366: extern rtx memset_libfunc;
367: extern rtx bzero_libfunc;
1.1.1.4 ! root 368:
1.1 root 369: extern rtx eqsf2_libfunc;
370: extern rtx nesf2_libfunc;
371: extern rtx gtsf2_libfunc;
372: extern rtx gesf2_libfunc;
373: extern rtx ltsf2_libfunc;
374: extern rtx lesf2_libfunc;
1.1.1.4 ! root 375:
1.1 root 376: extern rtx eqdf2_libfunc;
377: extern rtx nedf2_libfunc;
378: extern rtx gtdf2_libfunc;
379: extern rtx gedf2_libfunc;
380: extern rtx ltdf2_libfunc;
381: extern rtx ledf2_libfunc;
1.1.1.4 ! root 382:
! 383: extern rtx eqxf2_libfunc;
! 384: extern rtx nexf2_libfunc;
! 385: extern rtx gtxf2_libfunc;
! 386: extern rtx gexf2_libfunc;
! 387: extern rtx ltxf2_libfunc;
! 388: extern rtx lexf2_libfunc;
! 389:
! 390: extern rtx eqtf2_libfunc;
! 391: extern rtx netf2_libfunc;
! 392: extern rtx gttf2_libfunc;
! 393: extern rtx getf2_libfunc;
! 394: extern rtx lttf2_libfunc;
! 395: extern rtx letf2_libfunc;
! 396:
1.1 root 397: extern rtx floatsisf_libfunc;
1.1.1.4 ! root 398: extern rtx floatdisf_libfunc;
! 399: extern rtx floattisf_libfunc;
! 400:
1.1 root 401: extern rtx floatsidf_libfunc;
1.1.1.4 ! root 402: extern rtx floatdidf_libfunc;
! 403: extern rtx floattidf_libfunc;
! 404:
! 405: extern rtx floatsixf_libfunc;
! 406: extern rtx floatdixf_libfunc;
! 407: extern rtx floattixf_libfunc;
! 408:
! 409: extern rtx floatsitf_libfunc;
! 410: extern rtx floatditf_libfunc;
! 411: extern rtx floattitf_libfunc;
! 412:
1.1 root 413: extern rtx fixsfsi_libfunc;
414: extern rtx fixsfdi_libfunc;
1.1.1.4 ! root 415: extern rtx fixsfti_libfunc;
! 416:
1.1 root 417: extern rtx fixdfsi_libfunc;
418: extern rtx fixdfdi_libfunc;
1.1.1.4 ! root 419: extern rtx fixdfti_libfunc;
! 420:
! 421: extern rtx fixxfsi_libfunc;
! 422: extern rtx fixxfdi_libfunc;
! 423: extern rtx fixxfti_libfunc;
! 424:
! 425: extern rtx fixtfsi_libfunc;
! 426: extern rtx fixtfdi_libfunc;
! 427: extern rtx fixtfti_libfunc;
! 428:
1.1 root 429: extern rtx fixunssfsi_libfunc;
430: extern rtx fixunssfdi_libfunc;
1.1.1.4 ! root 431: extern rtx fixunssfti_libfunc;
! 432:
1.1 root 433: extern rtx fixunsdfsi_libfunc;
434: extern rtx fixunsdfdi_libfunc;
1.1.1.4 ! root 435: extern rtx fixunsdfti_libfunc;
! 436:
! 437: extern rtx fixunsxfsi_libfunc;
! 438: extern rtx fixunsxfdi_libfunc;
! 439: extern rtx fixunsxfti_libfunc;
! 440:
! 441: extern rtx fixunstfsi_libfunc;
! 442: extern rtx fixunstfdi_libfunc;
! 443: extern rtx fixunstfti_libfunc;
1.1 root 444:
445: typedef rtx (*rtxfun) ();
446:
447: /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
448: gives the gen_function to make a branch to test that condition. */
449:
450: extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
451:
452: /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
453: gives the insn code to make a store-condition insn
454: to test that condition. */
455:
456: extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
457:
458: /* Expand a binary operation given optab and rtx operands. */
459: extern rtx expand_binop ();
460:
461: /* Expand a binary operation with both signed and unsigned forms. */
462: extern rtx sign_expand_binop ();
463:
464: /* Expand a unary arithmetic operation given optab rtx operand. */
465: extern rtx expand_unop ();
466:
1.1.1.4 ! root 467: /* Expand the complex absolute value operation. */
! 468: extern rtx expand_complex_abs ();
! 469:
1.1 root 470: /* Arguments MODE, RTX: return an rtx for the negation of that value.
471: May emit insns. */
472: extern rtx negate_rtx ();
473:
474: /* Expand a logical AND operation. */
475: extern rtx expand_and ();
476:
477: /* Emit a store-flag operation. */
478: extern rtx emit_store_flag ();
479:
480: /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
481: extern rtx label_rtx ();
482:
483: /* Given a JUMP_INSN, return a description of the test being made. */
484: extern rtx get_condition ();
485:
486: /* Return the INSN_CODE to use for an extend operation. */
487: extern enum insn_code can_extend_p ();
488:
489: /* Initialize the tables that control conversion between fixed and
490: floating values. */
491: extern void init_fixtab ();
492: extern void init_floattab ();
493:
494: /* Generate code for a FIX_EXPR. */
495: extern void expand_fix ();
496:
497: /* Generate code for a FLOAT_EXPR. */
498: extern void expand_float ();
499:
500: /* Create but don't emit one rtl instruction to add one rtx into another.
501: Modes must match; operands must meet the operation's predicates.
502: Likewise for subtraction and for just copying.
503: These do not call protect_from_queue; caller must do so. */
504: extern rtx gen_add2_insn ();
505: extern rtx gen_sub2_insn ();
506: extern rtx gen_move_insn ();
507:
508: /* Emit one rtl instruction to store zero in specified rtx. */
509: extern void emit_clr_insn ();
510:
511: /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
512: extern void emit_0_to_1_insn ();
513:
514: /* Emit one rtl insn to compare two rtx's. */
515: extern void emit_cmp_insn ();
516:
1.1.1.3 root 517: /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
1.1 root 518: extern rtx compare_from_rtx ();
519:
520: /* Emit some rtl insns to move data between rtx's, converting machine modes.
521: Both modes must be floating or both fixed. */
522: extern void convert_move ();
523:
524: /* Convert an rtx to specified machine mode and return the result. */
525: extern rtx convert_to_mode ();
526:
527: /* Emit code to push some arguments and call a library routine,
528: storing the value in a specified place. Calling sequence is
529: complicated. */
530: extern void emit_library_call ();
531:
532: /* Given an rtx that may include add and multiply operations,
533: generate them as insns and return a pseudo-reg containing the value.
534: Useful after calling expand_expr with 1 as sum_ok. */
535: extern rtx force_operand ();
536:
537: /* Return an rtx for the size in bytes of the value of an expr. */
538: extern rtx expr_size ();
539:
540: extern rtx lookup_static_chain ();
541:
542: /* Return an rtx like arg but sans any constant terms.
543: Returns the original rtx if it has no constant terms.
544: The constant terms are added and stored via a second arg. */
545: extern rtx eliminate_constant_term ();
546:
547: /* Convert arg to a valid memory address for specified machine mode,
548: by emitting insns to perform arithmetic if nec. */
549: extern rtx memory_address ();
550:
551: /* Like `memory_address' but pretent `flag_force_addr' is 0. */
552: extern rtx memory_address_noforce ();
553:
554: /* Return a memory reference like MEMREF, but with its mode changed
555: to MODE and its address changed to ADDR.
556: (VOIDmode means don't change the mode.
557: NULL for ADDR means don't change the address.) */
558: extern rtx change_address ();
559:
560: /* Return a memory reference like MEMREF, but which is known to have a
561: valid address. */
562:
563: extern rtx validize_mem ();
564:
565: /* Convert a stack slot address ADDR valid in function FNDECL
566: into an address valid in this function (using a static chain). */
567: extern rtx fix_lexical_addr ();
568:
569: /* Return the address of the trampoline for entering nested fn FUNCTION. */
570: extern rtx trampoline_address ();
571:
572: /* Assemble the static constant template for function entry trampolines. */
573: extern rtx assemble_trampoline_template ();
574:
575: /* Return 1 if two rtx's are equivalent in structure and elements. */
576: extern int rtx_equal_p ();
577:
578: /* Given rtx, return new rtx whose address won't be affected by
579: any side effects. It has been copied to a new temporary reg. */
580: extern rtx stabilize ();
581:
582: /* Given an rtx, copy all regs it refers to into new temps
583: and return a modified copy that refers to the new temps. */
584: extern rtx copy_all_regs ();
585:
586: /* Copy given rtx to a new temp reg and return that. */
587: extern rtx copy_to_reg ();
588:
589: /* Like copy_to_reg but always make the reg Pmode. */
590: extern rtx copy_addr_to_reg ();
591:
592: /* Like copy_to_reg but always make the reg the specified mode MODE. */
593: extern rtx copy_to_mode_reg ();
594:
595: /* Copy given rtx to given temp reg and return that. */
596: extern rtx copy_to_suggested_reg ();
597:
598: /* Copy a value to a register if it isn't already a register.
599: Args are mode (in case value is a constant) and the value. */
600: extern rtx force_reg ();
601:
602: /* Return given rtx, copied into a new temp reg if it was in memory. */
603: extern rtx force_not_mem ();
604:
605: /* Remove some bytes from the stack. An rtx says how many. */
606: extern void adjust_stack ();
607:
608: /* Add some bytes to the stack. An rtx says how many. */
609: extern void anti_adjust_stack ();
610:
1.1.1.3 root 611: /* This enum is used for the following two functions. */
612: enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
613:
614: /* Save the stack pointer at the specified level. */
615: extern void emit_stack_save ();
616:
617: /* Restore the stack pointer from a save area of the specified level. */
618: extern void emit_stack_restore ();
619:
1.1 root 620: /* Allocate some space on the stack dynamically and return its address. An rtx
621: says how many bytes. */
622: extern rtx allocate_dynamic_stack_space ();
623:
624: /* Emit code to copy function value to a new temp reg and return that reg. */
625: extern rtx function_value ();
626:
627: /* Return an rtx that refers to the value returned by a function
628: in its original home. This becomes invalid if any more code is emitted. */
629: extern rtx hard_function_value ();
630:
631: /* Return an rtx that refers to the value returned by a library call
632: in its original home. This becomes invalid if any more code is emitted. */
633: extern rtx hard_libcall_value ();
634:
635: /* Emit code to copy function value to a specified place. */
636: extern void copy_function_value ();
637:
638: /* Given an rtx, return an rtx for a value rounded up to a multiple
639: of STACK_BOUNDARY / BITS_PER_UNIT. */
640: extern rtx round_push ();
641:
642: /* Push a block of length SIZE (perhaps variable)
643: and return an rtx to address the beginning of the block. */
644: extern rtx push_block ();
645:
646: /* Generate code for computing expression EXP,
647: and storing the value into TARGET.
648: If SUGGEST_REG is nonzero, copy the value through a register
649: and return that register, if that is possible. */
650: extern rtx store_expr ();
651:
652: extern rtx prepare_call_address ();
653: extern rtx expand_call ();
654: extern void emit_call_1 ();
655:
656: extern void emit_block_move ();
657: extern void emit_push_insn ();
658: extern void use_regs ();
659: extern void move_block_to_reg ();
660:
661: extern rtx store_bit_field ();
662: extern rtx extract_bit_field ();
663: extern rtx expand_shift ();
664: extern rtx expand_mult ();
665: extern rtx expand_divmod ();
666: extern rtx expand_mult_add ();
667: extern rtx expand_stmt_expr ();
668: extern rtx emit_no_conflict_block ();
669: extern void emit_libcall_block ();
670:
671: extern void jumpifnot ();
672: extern void jumpif ();
673: extern void do_jump ();
674:
675: extern rtx assemble_static_space ();
676:
677: extern void locate_and_pad_parm ();
678:
679: extern rtx expand_inline_function ();
680:
681: /* Hook called by expand_expr for language-specific tree codes.
682: It is up to the language front end to install a hook
683: if it has any such codes that expand_expr needs to know about. */
684: extern rtx (*lang_expand_expr) ();
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