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e8bbfc4e | 1 | /* Definitions for code generation pass of GNU compiler. |
99dee823 | 2 | Copyright (C) 1987-2021 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. */ |
ef4bddc2 | 72 | extern rtx convert_modes (machine_mode, machine_mode, rtx, int); |
3fad11c9 | 73 | |
ee516de9 EB |
74 | /* Expand a call to memcpy or memmove or memcmp, and return the result. */ |
75 | extern rtx emit_block_op_via_libcall (enum built_in_function, rtx, rtx, rtx, | |
76 | bool); | |
77 | ||
78 | static inline rtx | |
79 | emit_block_copy_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false) | |
80 | { | |
81 | return emit_block_op_via_libcall (BUILT_IN_MEMCPY, dst, src, size, tailcall); | |
82 | } | |
83 | ||
84 | static inline rtx | |
85 | emit_block_move_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false) | |
86 | { | |
87 | return emit_block_op_via_libcall (BUILT_IN_MEMMOVE, dst, src, size, tailcall); | |
88 | } | |
89 | ||
90 | static inline rtx | |
91 | emit_block_comp_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false) | |
92 | { | |
93 | return emit_block_op_via_libcall (BUILT_IN_MEMCMP, dst, src, size, tailcall); | |
94 | } | |
44bb111a | 95 | |
ee516de9 | 96 | /* Emit code to move a block Y to a block X. */ |
44bb111a RH |
97 | enum block_op_methods |
98 | { | |
99 | BLOCK_OP_NORMAL, | |
8403445a | 100 | BLOCK_OP_NO_LIBCALL, |
8148fe65 JJ |
101 | BLOCK_OP_CALL_PARM, |
102 | /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */ | |
fdd33254 ML |
103 | BLOCK_OP_TAILCALL, |
104 | /* Like BLOCK_OP_NO_LIBCALL, but instead of emitting a libcall return | |
105 | pc_rtx to indicate nothing has been emitted and let the caller handle | |
106 | it. */ | |
107 | BLOCK_OP_NO_LIBCALL_RET | |
44bb111a RH |
108 | }; |
109 | ||
985b3a68 | 110 | typedef rtx (*by_pieces_constfn) (void *, void *, HOST_WIDE_INT, |
e5e164ef | 111 | fixed_size_mode); |
985b3a68 L |
112 | |
113 | /* The second pointer passed to by_pieces_constfn. */ | |
114 | struct by_pieces_prev | |
115 | { | |
116 | rtx data; | |
e5e164ef | 117 | fixed_size_mode mode; |
985b3a68 | 118 | }; |
36b85e43 | 119 | |
502b8322 | 120 | extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods); |
079a182e | 121 | extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods, |
3918b108 JH |
122 | unsigned int, HOST_WIDE_INT, |
123 | unsigned HOST_WIDE_INT, | |
82bb7d4e | 124 | unsigned HOST_WIDE_INT, |
db91c7cf ML |
125 | unsigned HOST_WIDE_INT, |
126 | bool bail_out_libcall = false, | |
03a9b90a AS |
127 | bool *is_move_done = NULL, |
128 | bool might_overlap = false); | |
36b85e43 BS |
129 | extern rtx emit_block_cmp_hints (rtx, rtx, rtx, tree, rtx, bool, |
130 | by_pieces_constfn, void *); | |
28ed065e | 131 | extern bool emit_storent_insn (rtx to, rtx from); |
12e74c9e RK |
132 | |
133 | /* Copy all or part of a value X into registers starting at REGNO. | |
134 | The number of registers to be filled is NREGS. */ | |
ef4bddc2 | 135 | extern void move_block_to_reg (int, rtx, int, machine_mode); |
12e74c9e RK |
136 | |
137 | /* Copy all or part of a BLKmode value X out of registers starting at REGNO. | |
138 | The number of registers to be filled is NREGS. */ | |
502b8322 | 139 | extern void move_block_from_reg (int, rtx, int); |
12e74c9e | 140 | |
084a1106 | 141 | /* Generate a non-consecutive group of registers represented by a PARALLEL. */ |
502b8322 | 142 | extern rtx gen_group_rtx (rtx); |
084a1106 | 143 | |
ae73d3be JW |
144 | /* Load a BLKmode value into non-consecutive registers represented by a |
145 | PARALLEL. */ | |
f8f667be | 146 | extern void emit_group_load (rtx, rtx, tree, poly_int64); |
729a2125 | 147 | |
27e29549 | 148 | /* Similarly, but load into new temporaries. */ |
f8f667be | 149 | extern rtx emit_group_load_into_temps (rtx, rtx, tree, poly_int64); |
27e29549 | 150 | |
084a1106 JDA |
151 | /* Move a non-consecutive group of registers represented by a PARALLEL into |
152 | a non-consecutive group of registers represented by a PARALLEL. */ | |
502b8322 | 153 | extern void emit_group_move (rtx, rtx); |
084a1106 | 154 | |
27e29549 RH |
155 | /* Move a group of registers represented by a PARALLEL into pseudos. */ |
156 | extern rtx emit_group_move_into_temps (rtx); | |
157 | ||
ae73d3be JW |
158 | /* Store a BLKmode value from non-consecutive registers represented by a |
159 | PARALLEL. */ | |
f8f667be | 160 | extern void emit_group_store (rtx, rtx, tree, poly_int64); |
ae73d3be | 161 | |
9a002da8 RS |
162 | extern rtx maybe_emit_group_store (rtx, tree); |
163 | ||
7d810276 JJ |
164 | /* Mark REG as holding a parameter for the next CALL_INSN. |
165 | Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */ | |
ef4bddc2 RS |
166 | extern void use_reg_mode (rtx *, rtx, machine_mode); |
167 | extern void clobber_reg_mode (rtx *, rtx, machine_mode); | |
7d810276 | 168 | |
ef4bddc2 | 169 | extern rtx copy_blkmode_to_reg (machine_mode, tree); |
2ba87a29 | 170 | |
8c99eaf6 | 171 | /* Mark REG as holding a parameter for the next CALL_INSN. */ |
7d810276 JJ |
172 | static inline void |
173 | use_reg (rtx *fusage, rtx reg) | |
174 | { | |
175 | use_reg_mode (fusage, reg, VOIDmode); | |
176 | } | |
729a2125 | 177 | |
97891c11 TV |
178 | /* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE. */ |
179 | static inline void | |
180 | clobber_reg (rtx *fusage, rtx reg) | |
181 | { | |
182 | clobber_reg_mode (fusage, reg, VOIDmode); | |
183 | } | |
184 | ||
8c99eaf6 RK |
185 | /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters |
186 | for the next CALL_INSN. */ | |
502b8322 | 187 | extern void use_regs (rtx *, int, int); |
729a2125 | 188 | |
ae73d3be | 189 | /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */ |
502b8322 | 190 | extern void use_group_regs (rtx *, rtx); |
12e74c9e | 191 | |
36b85e43 BS |
192 | #ifdef GCC_INSN_CODES_H |
193 | extern rtx expand_cmpstrn_or_cmpmem (insn_code, rtx, rtx, rtx, tree, rtx, | |
194 | HOST_WIDE_INT); | |
195 | #endif | |
196 | ||
12e74c9e | 197 | /* Write zeros through the storage of OBJECT. |
8ac61af7 | 198 | If OBJECT has BLKmode, SIZE is its length in bytes. */ |
8148fe65 | 199 | extern rtx clear_storage (rtx, rtx, enum block_op_methods); |
079a182e | 200 | extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods, |
3918b108 JH |
201 | unsigned int, HOST_WIDE_INT, |
202 | unsigned HOST_WIDE_INT, | |
82bb7d4e | 203 | unsigned HOST_WIDE_INT, |
da9e6e63 AO |
204 | unsigned HOST_WIDE_INT, |
205 | unsigned); | |
8c996513 | 206 | /* The same, but always output an library call. */ |
ee516de9 | 207 | extern rtx set_storage_via_libcall (rtx, rtx, rtx, bool = false); |
12e74c9e | 208 | |
57e84f18 | 209 | /* Expand a setmem pattern; return true if successful. */ |
b8698a0f | 210 | extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int, |
3918b108 JH |
211 | unsigned int, HOST_WIDE_INT, |
212 | unsigned HOST_WIDE_INT, | |
82bb7d4e | 213 | unsigned HOST_WIDE_INT, |
3918b108 | 214 | unsigned HOST_WIDE_INT); |
57e84f18 | 215 | |
cc2902df | 216 | /* Return nonzero if it is desirable to store LEN bytes generated by |
57814e5e JJ |
217 | CONSTFUN with several move instructions by store_by_pieces |
218 | function. CONSTFUNDATA is a pointer which will be passed as argument | |
219 | in every CONSTFUN call. | |
cfa31150 SL |
220 | ALIGN is maximum alignment we can assume. |
221 | MEMSETP is true if this is a real memset/bzero, not a copy | |
222 | of a const string. */ | |
502b8322 | 223 | extern int can_store_by_pieces (unsigned HOST_WIDE_INT, |
36b85e43 | 224 | by_pieces_constfn, |
cfa31150 | 225 | void *, unsigned int, bool); |
57814e5e JJ |
226 | |
227 | /* Generate several move instructions to store LEN bytes generated by | |
228 | CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a | |
229 | pointer which will be passed as argument in every CONSTFUN call. | |
8fd3cf4e | 230 | ALIGN is maximum alignment we can assume. |
cfa31150 | 231 | MEMSETP is true if this is a real memset/bzero, not a copy. |
8fd3cf4e | 232 | Returns TO + LEN. */ |
36b85e43 | 233 | extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, by_pieces_constfn, |
2ff5ffb6 | 234 | void *, unsigned int, bool, memop_ret); |
57814e5e | 235 | |
da9e6e63 AO |
236 | /* If can_store_by_pieces passes for worst-case values near MAX_LEN, call |
237 | store_by_pieces within conditionals so as to handle variable LEN efficiently, | |
238 | storing VAL, if non-NULL_RTX, or valc instead. */ | |
239 | extern bool try_store_by_multiple_pieces (rtx to, rtx len, | |
240 | unsigned int ctz_len, | |
241 | unsigned HOST_WIDE_INT min_len, | |
242 | unsigned HOST_WIDE_INT max_len, | |
243 | rtx val, char valc, | |
244 | unsigned int align); | |
245 | ||
12e74c9e | 246 | /* Emit insns to set X from Y. */ |
f3222b79 | 247 | extern rtx_insn *emit_move_insn (rtx, rtx); |
1476d1bd | 248 | extern rtx_insn *gen_move_insn (rtx, rtx); |
12e74c9e RK |
249 | |
250 | /* Emit insns to set X from Y, with no frills. */ | |
f3222b79 | 251 | extern rtx_insn *emit_move_insn_1 (rtx, rtx); |
12e74c9e | 252 | |
ef4bddc2 | 253 | extern rtx_insn *emit_move_complex_push (machine_mode, rtx, rtx); |
f3222b79 | 254 | extern rtx_insn *emit_move_complex_parts (rtx, rtx); |
1f9ceff1 | 255 | extern rtx read_complex_part (rtx, bool); |
1304953e | 256 | extern void write_complex_part (rtx, rtx, bool); |
ee45a32d | 257 | extern rtx read_complex_part (rtx, bool); |
ef4bddc2 | 258 | extern rtx emit_move_resolve_push (machine_mode, rtx); |
ceca734e | 259 | |
12e74c9e RK |
260 | /* Push a block of length SIZE (perhaps variable) |
261 | and return an rtx to address the beginning of the block. */ | |
a15b25dc | 262 | extern rtx push_block (rtx, poly_int64, int); |
12e74c9e | 263 | |
12e74c9e | 264 | /* Generate code to push something onto the stack, given its mode and type. */ |
99206968 | 265 | extern bool emit_push_insn (rtx, machine_mode, tree, rtx, unsigned int, |
a15b25dc | 266 | int, rtx, poly_int64, rtx, rtx, int, rtx, bool); |
12e74c9e | 267 | |
585334d4 | 268 | /* Extract the accessible bit-range from a COMPONENT_REF. */ |
39bb8924 RS |
269 | extern void get_bit_range (poly_uint64_pod *, poly_uint64_pod *, tree, |
270 | poly_int64_pod *, tree *); | |
8a91d545 | 271 | |
19eb1ad7 | 272 | /* Expand an assignment that stores the value of FROM into TO. */ |
79f5e442 | 273 | extern void expand_assignment (tree, tree, bool); |
12e74c9e RK |
274 | |
275 | /* Generate code for computing expression EXP, | |
276 | and storing the value into TARGET. | |
277 | If SUGGEST_REG is nonzero, copy the value through a register | |
278 | and return that register, if that is possible. */ | |
ee45a32d | 279 | extern rtx store_expr (tree, rtx, int, bool, bool); |
e8bbfc4e RK |
280 | |
281 | /* Given an rtx that may include add and multiply operations, | |
282 | generate them as insns and return a pseudo-reg containing the value. | |
283 | Useful after calling expand_expr with 1 as sum_ok. */ | |
502b8322 | 284 | extern rtx force_operand (rtx, rtx); |
e8bbfc4e | 285 | |
28ed065e | 286 | /* Work horses for expand_expr. */ |
ef4bddc2 | 287 | extern rtx expand_expr_real (tree, rtx, machine_mode, |
4c437f02 | 288 | enum expand_modifier, rtx *, bool); |
ef4bddc2 | 289 | extern rtx expand_expr_real_1 (tree, rtx, machine_mode, |
4c437f02 | 290 | enum expand_modifier, rtx *, bool); |
ef4bddc2 | 291 | extern rtx expand_expr_real_2 (sepops, rtx, machine_mode, |
28ed065e | 292 | enum expand_modifier); |
673fda6b | 293 | |
12e74c9e RK |
294 | /* Generate code for computing expression EXP. |
295 | An rtx for the computed value is returned. The value is never null. | |
296 | In the case of a void EXP, const0_rtx is returned. */ | |
673fda6b | 297 | static inline rtx |
ef4bddc2 | 298 | expand_expr (tree exp, rtx target, machine_mode mode, |
673fda6b SB |
299 | enum expand_modifier modifier) |
300 | { | |
4c437f02 | 301 | return expand_expr_real (exp, target, mode, modifier, NULL, false); |
673fda6b | 302 | } |
12e74c9e | 303 | |
84217346 MD |
304 | static inline rtx |
305 | expand_normal (tree exp) | |
306 | { | |
4c437f02 | 307 | return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false); |
84217346 MD |
308 | } |
309 | ||
7f2f0a01 | 310 | |
866626ef MS |
311 | /* Return STRING_CST and set offset, size and decl, if the first |
312 | argument corresponds to a string constant. */ | |
e84bf0ef | 313 | extern tree string_constant (tree, tree *, tree *, tree *); |
866626ef MS |
314 | /* Similar to string_constant, return a STRING_CST corresponding |
315 | to the value representation of the first argument if it's | |
316 | a constant. */ | |
317 | extern tree byte_representation (tree, tree *, tree *, tree *); | |
c0cbe526 JJ |
318 | |
319 | extern enum tree_code maybe_optimize_mod_cmp (enum tree_code, tree *, tree *); | |
5de7bf5b | 320 | extern void maybe_optimize_sub_cmp_0 (enum tree_code, tree *, tree *); |
28f4ec01 | 321 | |
ad82abb8 | 322 | /* Two different ways of generating switch statements. */ |
357067f2 JH |
323 | extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, profile_probability); |
324 | extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, profile_probability); | |
ad82abb8 | 325 | |
22ea9ec0 | 326 | extern int safe_from_p (const_rtx, tree, int); |
8f17b5c5 | 327 | |
f9417da1 RG |
328 | /* Get the personality libfunc for a function decl. */ |
329 | rtx get_personality_function (tree); | |
330 | ||
d8a2d370 DN |
331 | /* Determine whether the LEN bytes can be moved by using several move |
332 | instructions. Return nonzero if a call to move_by_pieces should | |
333 | succeed. */ | |
36b85e43 | 334 | extern bool can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int); |
d8a2d370 DN |
335 | |
336 | extern unsigned HOST_WIDE_INT highest_pow2_factor (const_tree); | |
d8a2d370 DN |
337 | |
338 | extern bool categorize_ctor_elements (const_tree, HOST_WIDE_INT *, | |
0fca07e3 JJ |
339 | HOST_WIDE_INT *, HOST_WIDE_INT *, |
340 | bool *); | |
d8a2d370 | 341 | |
2d52a3a1 ZC |
342 | extern void expand_operands (tree, tree, rtx, rtx*, rtx*, |
343 | enum expand_modifier); | |
36566b39 PK |
344 | |
345 | /* rtl.h and tree.h were included. */ | |
346 | /* Return an rtx for the size in bytes of the value of an expr. */ | |
347 | extern rtx expr_size (tree); | |
348 | ||
78528714 | 349 | #endif /* GCC_EXPR_H */ |