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e8bbfc4e | 1 | /* Definitions for code generation pass of GNU compiler. |
aeee4812 | 2 | Copyright (C) 1987-2023 Free Software Foundation, Inc. |
e8bbfc4e | 3 | |
1322177d | 4 | This file is part of GCC. |
e8bbfc4e | 5 | |
1322177d LB |
6 | GCC is free software; you can redistribute it and/or modify it under |
7 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 8 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 9 | version. |
e8bbfc4e | 10 | |
1322177d LB |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
e8bbfc4e RK |
15 | |
16 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
e8bbfc4e | 19 | |
78528714 JQ |
20 | #ifndef GCC_EXPR_H |
21 | #define GCC_EXPR_H | |
22 | ||
e8bbfc4e | 23 | /* This is the 4th arg to `expand_expr'. |
8403445a | 24 | EXPAND_STACK_PARM means we are possibly expanding a call param onto |
0cc1b879 | 25 | the stack. |
e8bbfc4e RK |
26 | EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx. |
27 | EXPAND_INITIALIZER is similar but also record any labels on forced_labels. | |
28 | EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address | |
99b5da08 | 29 | is a constant that is not a legitimate address. |
017e1b43 RH |
30 | EXPAND_WRITE means we are only going to write to the resulting rtx. |
31 | EXPAND_MEMORY means we are interested in a memory result, even if | |
4c437f02 BE |
32 | the memory is constant and we could have propagated a constant value, |
33 | or the memory is unaligned on a STRICT_ALIGNMENT target. */ | |
0cc1b879 | 34 | enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM, |
017e1b43 RH |
35 | EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE, |
36 | EXPAND_MEMORY}; | |
e8bbfc4e | 37 | |
5c7a310f MM |
38 | /* Prevent the compiler from deferring stack pops. See |
39 | inhibit_defer_pop for more information. */ | |
40 | #define NO_DEFER_POP (inhibit_defer_pop += 1) | |
41 | ||
42 | /* Allow the compiler to defer stack pops. See inhibit_defer_pop for | |
43 | more information. */ | |
44 | #define OK_DEFER_POP (inhibit_defer_pop -= 1) | |
e8bbfc4e | 45 | \f |
8e7aa1f9 MM |
46 | /* This structure is used to pass around information about exploded |
47 | unary, binary and trinary expressions between expand_expr_real_1 and | |
48 | friends. */ | |
49 | typedef struct separate_ops | |
50 | { | |
51 | enum tree_code code; | |
25efe060 | 52 | location_t location; |
8e7aa1f9 MM |
53 | tree type; |
54 | tree op0, op1, op2; | |
8e7aa1f9 | 55 | } *sepops; |
12e74c9e | 56 | \f |
b8698a0f | 57 | /* This is run during target initialization to set up which modes can be |
b5deb7b6 SL |
58 | used directly in memory and to initialize the block move optab. */ |
59 | extern void init_expr_target (void); | |
12e74c9e RK |
60 | |
61 | /* This is run at the start of compiling a function. */ | |
502b8322 | 62 | extern void init_expr (void); |
12e74c9e | 63 | |
e8bbfc4e RK |
64 | /* Emit some rtl insns to move data between rtx's, converting machine modes. |
65 | Both modes must be floating or both fixed. */ | |
502b8322 | 66 | extern void convert_move (rtx, rtx, int); |
e8bbfc4e RK |
67 | |
68 | /* Convert an rtx to specified machine mode and return the result. */ | |
ef4bddc2 | 69 | extern rtx convert_to_mode (machine_mode, rtx, int); |
e8bbfc4e | 70 | |
3fad11c9 | 71 | /* Convert an rtx to MODE from OLDMODE and return the result. */ |
ac4c8f53 RS |
72 | extern rtx convert_modes (machine_mode mode, machine_mode oldmode, |
73 | rtx x, int unsignedp); | |
74 | ||
75 | /* Variant of convert_modes for ABI parameter passing/return. */ | |
76 | extern rtx convert_float_to_wider_int (machine_mode mode, machine_mode fmode, | |
77 | rtx x); | |
78 | ||
79 | /* Variant of convert_modes for ABI parameter passing/return. */ | |
80 | extern rtx convert_wider_int_to_float (machine_mode mode, machine_mode imode, | |
81 | rtx x); | |
3fad11c9 | 82 | |
ee516de9 EB |
83 | /* Expand a call to memcpy or memmove or memcmp, and return the result. */ |
84 | extern rtx emit_block_op_via_libcall (enum built_in_function, rtx, rtx, rtx, | |
85 | bool); | |
86 | ||
cb3e0eac | 87 | inline rtx |
ee516de9 EB |
88 | emit_block_copy_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false) |
89 | { | |
90 | return emit_block_op_via_libcall (BUILT_IN_MEMCPY, dst, src, size, tailcall); | |
91 | } | |
92 | ||
cb3e0eac | 93 | inline rtx |
ee516de9 EB |
94 | emit_block_move_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false) |
95 | { | |
96 | return emit_block_op_via_libcall (BUILT_IN_MEMMOVE, dst, src, size, tailcall); | |
97 | } | |
98 | ||
cb3e0eac | 99 | inline rtx |
ee516de9 EB |
100 | emit_block_comp_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false) |
101 | { | |
102 | return emit_block_op_via_libcall (BUILT_IN_MEMCMP, dst, src, size, tailcall); | |
103 | } | |
44bb111a | 104 | |
ee516de9 | 105 | /* Emit code to move a block Y to a block X. */ |
44bb111a RH |
106 | enum block_op_methods |
107 | { | |
108 | BLOCK_OP_NORMAL, | |
8403445a | 109 | BLOCK_OP_NO_LIBCALL, |
8148fe65 JJ |
110 | BLOCK_OP_CALL_PARM, |
111 | /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */ | |
fdd33254 ML |
112 | BLOCK_OP_TAILCALL, |
113 | /* Like BLOCK_OP_NO_LIBCALL, but instead of emitting a libcall return | |
114 | pc_rtx to indicate nothing has been emitted and let the caller handle | |
115 | it. */ | |
116 | BLOCK_OP_NO_LIBCALL_RET | |
44bb111a RH |
117 | }; |
118 | ||
985b3a68 | 119 | typedef rtx (*by_pieces_constfn) (void *, void *, HOST_WIDE_INT, |
e5e164ef | 120 | fixed_size_mode); |
985b3a68 L |
121 | |
122 | /* The second pointer passed to by_pieces_constfn. */ | |
123 | struct by_pieces_prev | |
124 | { | |
125 | rtx data; | |
e5e164ef | 126 | fixed_size_mode mode; |
985b3a68 | 127 | }; |
36b85e43 | 128 | |
502b8322 | 129 | extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods); |
079a182e | 130 | extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods, |
3918b108 JH |
131 | unsigned int, HOST_WIDE_INT, |
132 | unsigned HOST_WIDE_INT, | |
82bb7d4e | 133 | unsigned HOST_WIDE_INT, |
db91c7cf ML |
134 | unsigned HOST_WIDE_INT, |
135 | bool bail_out_libcall = false, | |
03a9b90a AS |
136 | bool *is_move_done = NULL, |
137 | bool might_overlap = false); | |
36b85e43 BS |
138 | extern rtx emit_block_cmp_hints (rtx, rtx, rtx, tree, rtx, bool, |
139 | by_pieces_constfn, void *); | |
28ed065e | 140 | extern bool emit_storent_insn (rtx to, rtx from); |
12e74c9e RK |
141 | |
142 | /* Copy all or part of a value X into registers starting at REGNO. | |
143 | The number of registers to be filled is NREGS. */ | |
ef4bddc2 | 144 | extern void move_block_to_reg (int, rtx, int, machine_mode); |
12e74c9e RK |
145 | |
146 | /* Copy all or part of a BLKmode value X out of registers starting at REGNO. | |
147 | The number of registers to be filled is NREGS. */ | |
502b8322 | 148 | extern void move_block_from_reg (int, rtx, int); |
12e74c9e | 149 | |
084a1106 | 150 | /* Generate a non-consecutive group of registers represented by a PARALLEL. */ |
502b8322 | 151 | extern rtx gen_group_rtx (rtx); |
084a1106 | 152 | |
ae73d3be JW |
153 | /* Load a BLKmode value into non-consecutive registers represented by a |
154 | PARALLEL. */ | |
f8f667be | 155 | extern void emit_group_load (rtx, rtx, tree, poly_int64); |
729a2125 | 156 | |
27e29549 | 157 | /* Similarly, but load into new temporaries. */ |
f8f667be | 158 | extern rtx emit_group_load_into_temps (rtx, rtx, tree, poly_int64); |
27e29549 | 159 | |
084a1106 JDA |
160 | /* Move a non-consecutive group of registers represented by a PARALLEL into |
161 | a non-consecutive group of registers represented by a PARALLEL. */ | |
502b8322 | 162 | extern void emit_group_move (rtx, rtx); |
084a1106 | 163 | |
27e29549 RH |
164 | /* Move a group of registers represented by a PARALLEL into pseudos. */ |
165 | extern rtx emit_group_move_into_temps (rtx); | |
166 | ||
ae73d3be JW |
167 | /* Store a BLKmode value from non-consecutive registers represented by a |
168 | PARALLEL. */ | |
f8f667be | 169 | extern void emit_group_store (rtx, rtx, tree, poly_int64); |
ae73d3be | 170 | |
9a002da8 RS |
171 | extern rtx maybe_emit_group_store (rtx, tree); |
172 | ||
7d810276 JJ |
173 | /* Mark REG as holding a parameter for the next CALL_INSN. |
174 | Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */ | |
ef4bddc2 RS |
175 | extern void use_reg_mode (rtx *, rtx, machine_mode); |
176 | extern void clobber_reg_mode (rtx *, rtx, machine_mode); | |
7d810276 | 177 | |
ef4bddc2 | 178 | extern rtx copy_blkmode_to_reg (machine_mode, tree); |
2ba87a29 | 179 | |
8c99eaf6 | 180 | /* Mark REG as holding a parameter for the next CALL_INSN. */ |
cb3e0eac | 181 | inline void |
7d810276 JJ |
182 | use_reg (rtx *fusage, rtx reg) |
183 | { | |
184 | use_reg_mode (fusage, reg, VOIDmode); | |
185 | } | |
729a2125 | 186 | |
97891c11 | 187 | /* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE. */ |
cb3e0eac | 188 | inline void |
97891c11 TV |
189 | clobber_reg (rtx *fusage, rtx reg) |
190 | { | |
191 | clobber_reg_mode (fusage, reg, VOIDmode); | |
192 | } | |
193 | ||
8c99eaf6 RK |
194 | /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters |
195 | for the next CALL_INSN. */ | |
502b8322 | 196 | extern void use_regs (rtx *, int, int); |
729a2125 | 197 | |
ae73d3be | 198 | /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */ |
502b8322 | 199 | extern void use_group_regs (rtx *, rtx); |
12e74c9e | 200 | |
36b85e43 BS |
201 | #ifdef GCC_INSN_CODES_H |
202 | extern rtx expand_cmpstrn_or_cmpmem (insn_code, rtx, rtx, rtx, tree, rtx, | |
203 | HOST_WIDE_INT); | |
204 | #endif | |
205 | ||
12e74c9e | 206 | /* Write zeros through the storage of OBJECT. |
8ac61af7 | 207 | If OBJECT has BLKmode, SIZE is its length in bytes. */ |
8148fe65 | 208 | extern rtx clear_storage (rtx, rtx, enum block_op_methods); |
079a182e | 209 | extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods, |
3918b108 JH |
210 | unsigned int, HOST_WIDE_INT, |
211 | unsigned HOST_WIDE_INT, | |
82bb7d4e | 212 | unsigned HOST_WIDE_INT, |
da9e6e63 AO |
213 | unsigned HOST_WIDE_INT, |
214 | unsigned); | |
8c996513 | 215 | /* The same, but always output an library call. */ |
ee516de9 | 216 | extern rtx set_storage_via_libcall (rtx, rtx, rtx, bool = false); |
12e74c9e | 217 | |
57e84f18 | 218 | /* Expand a setmem pattern; return true if successful. */ |
b8698a0f | 219 | extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int, |
3918b108 JH |
220 | unsigned int, HOST_WIDE_INT, |
221 | unsigned HOST_WIDE_INT, | |
82bb7d4e | 222 | unsigned HOST_WIDE_INT, |
3918b108 | 223 | unsigned HOST_WIDE_INT); |
57e84f18 | 224 | |
cc2902df | 225 | /* Return nonzero if it is desirable to store LEN bytes generated by |
57814e5e JJ |
226 | CONSTFUN with several move instructions by store_by_pieces |
227 | function. CONSTFUNDATA is a pointer which will be passed as argument | |
228 | in every CONSTFUN call. | |
cfa31150 SL |
229 | ALIGN is maximum alignment we can assume. |
230 | MEMSETP is true if this is a real memset/bzero, not a copy | |
231 | of a const string. */ | |
502b8322 | 232 | extern int can_store_by_pieces (unsigned HOST_WIDE_INT, |
36b85e43 | 233 | by_pieces_constfn, |
cfa31150 | 234 | void *, unsigned int, bool); |
57814e5e JJ |
235 | |
236 | /* Generate several move instructions to store LEN bytes generated by | |
237 | CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a | |
238 | pointer which will be passed as argument in every CONSTFUN call. | |
8fd3cf4e | 239 | ALIGN is maximum alignment we can assume. |
cfa31150 | 240 | MEMSETP is true if this is a real memset/bzero, not a copy. |
8fd3cf4e | 241 | Returns TO + LEN. */ |
36b85e43 | 242 | extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, by_pieces_constfn, |
2ff5ffb6 | 243 | void *, unsigned int, bool, memop_ret); |
57814e5e | 244 | |
da9e6e63 AO |
245 | /* If can_store_by_pieces passes for worst-case values near MAX_LEN, call |
246 | store_by_pieces within conditionals so as to handle variable LEN efficiently, | |
247 | storing VAL, if non-NULL_RTX, or valc instead. */ | |
248 | extern bool try_store_by_multiple_pieces (rtx to, rtx len, | |
249 | unsigned int ctz_len, | |
250 | unsigned HOST_WIDE_INT min_len, | |
251 | unsigned HOST_WIDE_INT max_len, | |
252 | rtx val, char valc, | |
253 | unsigned int align); | |
254 | ||
12e74c9e | 255 | /* Emit insns to set X from Y. */ |
f3222b79 | 256 | extern rtx_insn *emit_move_insn (rtx, rtx); |
1476d1bd | 257 | extern rtx_insn *gen_move_insn (rtx, rtx); |
12e74c9e RK |
258 | |
259 | /* Emit insns to set X from Y, with no frills. */ | |
f3222b79 | 260 | extern rtx_insn *emit_move_insn_1 (rtx, rtx); |
12e74c9e | 261 | |
ef4bddc2 | 262 | extern rtx_insn *emit_move_complex_push (machine_mode, rtx, rtx); |
f3222b79 | 263 | extern rtx_insn *emit_move_complex_parts (rtx, rtx); |
1f9ceff1 | 264 | extern rtx read_complex_part (rtx, bool); |
13f44099 | 265 | extern void write_complex_part (rtx, rtx, bool, bool); |
ee45a32d | 266 | extern rtx read_complex_part (rtx, bool); |
ef4bddc2 | 267 | extern rtx emit_move_resolve_push (machine_mode, rtx); |
ceca734e | 268 | |
12e74c9e RK |
269 | /* Push a block of length SIZE (perhaps variable) |
270 | and return an rtx to address the beginning of the block. */ | |
a15b25dc | 271 | extern rtx push_block (rtx, poly_int64, int); |
12e74c9e | 272 | |
12e74c9e | 273 | /* Generate code to push something onto the stack, given its mode and type. */ |
99206968 | 274 | extern bool emit_push_insn (rtx, machine_mode, tree, rtx, unsigned int, |
a15b25dc | 275 | int, rtx, poly_int64, rtx, rtx, int, rtx, bool); |
12e74c9e | 276 | |
585334d4 | 277 | /* Extract the accessible bit-range from a COMPONENT_REF. */ |
39bb8924 RS |
278 | extern void get_bit_range (poly_uint64_pod *, poly_uint64_pod *, tree, |
279 | poly_int64_pod *, tree *); | |
8a91d545 | 280 | |
19eb1ad7 | 281 | /* Expand an assignment that stores the value of FROM into TO. */ |
79f5e442 | 282 | extern void expand_assignment (tree, tree, bool); |
12e74c9e RK |
283 | |
284 | /* Generate code for computing expression EXP, | |
285 | and storing the value into TARGET. | |
286 | If SUGGEST_REG is nonzero, copy the value through a register | |
287 | and return that register, if that is possible. */ | |
ee45a32d | 288 | extern rtx store_expr (tree, rtx, int, bool, bool); |
e8bbfc4e RK |
289 | |
290 | /* Given an rtx that may include add and multiply operations, | |
291 | generate them as insns and return a pseudo-reg containing the value. | |
292 | Useful after calling expand_expr with 1 as sum_ok. */ | |
502b8322 | 293 | extern rtx force_operand (rtx, rtx); |
e8bbfc4e | 294 | |
28ed065e | 295 | /* Work horses for expand_expr. */ |
ef4bddc2 | 296 | extern rtx expand_expr_real (tree, rtx, machine_mode, |
4c437f02 | 297 | enum expand_modifier, rtx *, bool); |
ef4bddc2 | 298 | extern rtx expand_expr_real_1 (tree, rtx, machine_mode, |
4c437f02 | 299 | enum expand_modifier, rtx *, bool); |
ef4bddc2 | 300 | extern rtx expand_expr_real_2 (sepops, rtx, machine_mode, |
28ed065e | 301 | enum expand_modifier); |
673fda6b | 302 | |
12e74c9e RK |
303 | /* Generate code for computing expression EXP. |
304 | An rtx for the computed value is returned. The value is never null. | |
305 | In the case of a void EXP, const0_rtx is returned. */ | |
cb3e0eac | 306 | inline rtx |
ef4bddc2 | 307 | expand_expr (tree exp, rtx target, machine_mode mode, |
673fda6b SB |
308 | enum expand_modifier modifier) |
309 | { | |
4c437f02 | 310 | return expand_expr_real (exp, target, mode, modifier, NULL, false); |
673fda6b | 311 | } |
12e74c9e | 312 | |
cb3e0eac | 313 | inline rtx |
84217346 MD |
314 | expand_normal (tree exp) |
315 | { | |
4c437f02 | 316 | return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false); |
84217346 MD |
317 | } |
318 | ||
7f2f0a01 | 319 | |
866626ef MS |
320 | /* Return STRING_CST and set offset, size and decl, if the first |
321 | argument corresponds to a string constant. */ | |
e84bf0ef | 322 | extern tree string_constant (tree, tree *, tree *, tree *); |
866626ef MS |
323 | /* Similar to string_constant, return a STRING_CST corresponding |
324 | to the value representation of the first argument if it's | |
325 | a constant. */ | |
326 | extern tree byte_representation (tree, tree *, tree *, tree *); | |
c0cbe526 JJ |
327 | |
328 | extern enum tree_code maybe_optimize_mod_cmp (enum tree_code, tree *, tree *); | |
5de7bf5b | 329 | extern void maybe_optimize_sub_cmp_0 (enum tree_code, tree *, tree *); |
28f4ec01 | 330 | |
ad82abb8 | 331 | /* Two different ways of generating switch statements. */ |
357067f2 JH |
332 | extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, profile_probability); |
333 | extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, profile_probability); | |
ad82abb8 | 334 | |
22ea9ec0 | 335 | extern int safe_from_p (const_rtx, tree, int); |
8f17b5c5 | 336 | |
f9417da1 RG |
337 | /* Get the personality libfunc for a function decl. */ |
338 | rtx get_personality_function (tree); | |
339 | ||
d8a2d370 DN |
340 | /* Determine whether the LEN bytes can be moved by using several move |
341 | instructions. Return nonzero if a call to move_by_pieces should | |
342 | succeed. */ | |
36b85e43 | 343 | extern bool can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int); |
d8a2d370 DN |
344 | |
345 | extern unsigned HOST_WIDE_INT highest_pow2_factor (const_tree); | |
d8a2d370 DN |
346 | |
347 | extern bool categorize_ctor_elements (const_tree, HOST_WIDE_INT *, | |
0fca07e3 JJ |
348 | HOST_WIDE_INT *, HOST_WIDE_INT *, |
349 | bool *); | |
ed6fd2ae | 350 | extern bool immediate_const_ctor_p (const_tree, unsigned int words = 1); |
c00e1e3a RS |
351 | extern void store_constructor (tree, rtx, int, poly_int64, bool); |
352 | extern HOST_WIDE_INT int_expr_size (const_tree exp); | |
d8a2d370 | 353 | |
2d52a3a1 ZC |
354 | extern void expand_operands (tree, tree, rtx, rtx*, rtx*, |
355 | enum expand_modifier); | |
36566b39 PK |
356 | |
357 | /* rtl.h and tree.h were included. */ | |
358 | /* Return an rtx for the size in bytes of the value of an expr. */ | |
359 | extern rtx expr_size (tree); | |
360 | ||
7e0c0500 RB |
361 | extern bool mem_ref_refers_to_non_mem_p (tree); |
362 | extern bool non_mem_decl_p (tree); | |
363 | ||
78528714 | 364 | #endif /* GCC_EXPR_H */ |