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1 : : /* Definitions for code generation pass of GNU compiler.
2 : : Copyright (C) 1987-2024 Free Software Foundation, Inc.
3 : :
4 : : This file is part of GCC.
5 : :
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
8 : : Software Foundation; either version 3, or (at your option) any later
9 : : version.
10 : :
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.
15 : :
16 : : You should have received a copy of the GNU General Public License
17 : : along with GCC; see the file COPYING3. If not see
18 : : <http://www.gnu.org/licenses/>. */
19 : :
20 : : #ifndef GCC_EXPR_H
21 : : #define GCC_EXPR_H
22 : :
23 : : /* This is the 4th arg to `expand_expr'.
24 : : EXPAND_STACK_PARM means we are possibly expanding a call param onto
25 : : the stack.
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
29 : : is a constant that is not a legitimate address.
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
32 : : the memory is constant and we could have propagated a constant value,
33 : : or the memory is unaligned on a STRICT_ALIGNMENT target. */
34 : : enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
35 : : EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
36 : : EXPAND_MEMORY};
37 : :
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)
45 : :
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;
52 : : location_t location;
53 : : tree type;
54 : : tree op0, op1, op2;
55 : : } *sepops;
56 : :
57 : : /* This is run during target initialization to set up which modes can be
58 : : used directly in memory and to initialize the block move optab. */
59 : : extern void init_expr_target (void);
60 : :
61 : : /* This is run at the start of compiling a function. */
62 : : extern void init_expr (void);
63 : :
64 : : /* Emit some rtl insns to move data between rtx's, converting machine modes.
65 : : Both modes must be floating or both fixed. */
66 : : extern void convert_move (rtx, rtx, int);
67 : :
68 : : /* Convert an rtx to specified machine mode and return the result. */
69 : : extern rtx convert_to_mode (machine_mode, rtx, int);
70 : :
71 : : /* Convert an rtx to MODE from OLDMODE and return the result. */
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);
82 : :
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 : :
87 : : inline rtx
88 : 34230 : emit_block_copy_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
89 : : {
90 : 34230 : return emit_block_op_via_libcall (BUILT_IN_MEMCPY, dst, src, size, tailcall);
91 : : }
92 : :
93 : : inline rtx
94 : 0 : emit_block_move_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
95 : : {
96 : 0 : return emit_block_op_via_libcall (BUILT_IN_MEMMOVE, dst, src, size, tailcall);
97 : : }
98 : :
99 : : inline rtx
100 : 0 : emit_block_comp_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
101 : : {
102 : 0 : return emit_block_op_via_libcall (BUILT_IN_MEMCMP, dst, src, size, tailcall);
103 : : }
104 : :
105 : : /* Emit code to move a block Y to a block X. */
106 : : enum block_op_methods
107 : : {
108 : : BLOCK_OP_NORMAL,
109 : : BLOCK_OP_NO_LIBCALL,
110 : : BLOCK_OP_CALL_PARM,
111 : : /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
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
117 : : };
118 : :
119 : : typedef rtx (*by_pieces_constfn) (void *, void *, HOST_WIDE_INT,
120 : : fixed_size_mode);
121 : :
122 : : /* The second pointer passed to by_pieces_constfn. */
123 : : struct by_pieces_prev
124 : : {
125 : : rtx data;
126 : : fixed_size_mode mode;
127 : : };
128 : :
129 : : extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods,
130 : : unsigned ctz_size = 0);
131 : : extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
132 : : unsigned int, HOST_WIDE_INT,
133 : : unsigned HOST_WIDE_INT,
134 : : unsigned HOST_WIDE_INT,
135 : : unsigned HOST_WIDE_INT,
136 : : bool bail_out_libcall = false,
137 : : bool *is_move_done = NULL,
138 : : bool might_overlap = false,
139 : : unsigned ctz_size = 0);
140 : : extern rtx emit_block_cmp_hints (rtx, rtx, rtx, tree, rtx, bool,
141 : : by_pieces_constfn, void *,
142 : : unsigned ctz_len = 0);
143 : : extern bool emit_storent_insn (rtx to, rtx from);
144 : :
145 : : /* Copy all or part of a value X into registers starting at REGNO.
146 : : The number of registers to be filled is NREGS. */
147 : : extern void move_block_to_reg (int, rtx, int, machine_mode);
148 : :
149 : : /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
150 : : The number of registers to be filled is NREGS. */
151 : : extern void move_block_from_reg (int, rtx, int);
152 : :
153 : : /* Generate a non-consecutive group of registers represented by a PARALLEL. */
154 : : extern rtx gen_group_rtx (rtx);
155 : :
156 : : /* Load a BLKmode value into non-consecutive registers represented by a
157 : : PARALLEL. */
158 : : extern void emit_group_load (rtx, rtx, tree, poly_int64);
159 : :
160 : : /* Similarly, but load into new temporaries. */
161 : : extern rtx emit_group_load_into_temps (rtx, rtx, tree, poly_int64);
162 : :
163 : : /* Move a non-consecutive group of registers represented by a PARALLEL into
164 : : a non-consecutive group of registers represented by a PARALLEL. */
165 : : extern void emit_group_move (rtx, rtx);
166 : :
167 : : /* Move a group of registers represented by a PARALLEL into pseudos. */
168 : : extern rtx emit_group_move_into_temps (rtx);
169 : :
170 : : /* Store a BLKmode value from non-consecutive registers represented by a
171 : : PARALLEL. */
172 : : extern void emit_group_store (rtx, rtx, tree, poly_int64);
173 : :
174 : : extern rtx maybe_emit_group_store (rtx, tree);
175 : :
176 : : /* Mark REG as holding a parameter for the next CALL_INSN.
177 : : Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */
178 : : extern void use_reg_mode (rtx *, rtx, machine_mode);
179 : : extern void clobber_reg_mode (rtx *, rtx, machine_mode);
180 : :
181 : : extern rtx copy_blkmode_to_reg (machine_mode, tree);
182 : :
183 : : /* Mark REG as holding a parameter for the next CALL_INSN. */
184 : : inline void
185 : 1601819 : use_reg (rtx *fusage, rtx reg)
186 : : {
187 : 1601819 : use_reg_mode (fusage, reg, VOIDmode);
188 : 1212871 : }
189 : :
190 : : /* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE. */
191 : : inline void
192 : 797463 : clobber_reg (rtx *fusage, rtx reg)
193 : : {
194 : 797463 : clobber_reg_mode (fusage, reg, VOIDmode);
195 : 2043 : }
196 : :
197 : : /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
198 : : for the next CALL_INSN. */
199 : : extern void use_regs (rtx *, int, int);
200 : :
201 : : /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
202 : : extern void use_group_regs (rtx *, rtx);
203 : :
204 : : #ifdef GCC_INSN_CODES_H
205 : : extern rtx expand_cmpstrn_or_cmpmem (insn_code, rtx, rtx, rtx, tree, rtx,
206 : : HOST_WIDE_INT);
207 : : #endif
208 : :
209 : : /* Write zeros through the storage of OBJECT.
210 : : If OBJECT has BLKmode, SIZE is its length in bytes. */
211 : : extern rtx clear_storage (rtx, rtx, enum block_op_methods);
212 : : extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
213 : : unsigned int, HOST_WIDE_INT,
214 : : unsigned HOST_WIDE_INT,
215 : : unsigned HOST_WIDE_INT,
216 : : unsigned HOST_WIDE_INT,
217 : : unsigned);
218 : : /* The same, but always output an library call. */
219 : : extern rtx set_storage_via_libcall (rtx, rtx, rtx, bool = false);
220 : :
221 : : /* Expand a setmem pattern; return true if successful. */
222 : : extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
223 : : unsigned int, HOST_WIDE_INT,
224 : : unsigned HOST_WIDE_INT,
225 : : unsigned HOST_WIDE_INT,
226 : : unsigned HOST_WIDE_INT);
227 : :
228 : : /* Return true if it is desirable to store LEN bytes generated by
229 : : CONSTFUN with several move instructions by store_by_pieces
230 : : function. CONSTFUNDATA is a pointer which will be passed as argument
231 : : in every CONSTFUN call.
232 : : ALIGN is maximum alignment we can assume.
233 : : MEMSETP is true if this is a real memset/bzero, not a copy
234 : : of a const string. */
235 : : extern bool can_store_by_pieces (unsigned HOST_WIDE_INT,
236 : : by_pieces_constfn,
237 : : void *, unsigned int, bool);
238 : :
239 : : /* Generate several move instructions to store LEN bytes generated by
240 : : CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
241 : : pointer which will be passed as argument in every CONSTFUN call.
242 : : ALIGN is maximum alignment we can assume.
243 : : MEMSETP is true if this is a real memset/bzero, not a copy.
244 : : Returns TO + LEN. */
245 : : extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, by_pieces_constfn,
246 : : void *, unsigned int, bool, memop_ret);
247 : :
248 : : /* If can_store_by_pieces passes for worst-case values near MAX_LEN, call
249 : : store_by_pieces within conditionals so as to handle variable LEN efficiently,
250 : : storing VAL, if non-NULL_RTX, or valc instead. */
251 : : extern bool try_store_by_multiple_pieces (rtx to, rtx len,
252 : : unsigned int ctz_len,
253 : : unsigned HOST_WIDE_INT min_len,
254 : : unsigned HOST_WIDE_INT max_len,
255 : : rtx val, char valc,
256 : : unsigned int align);
257 : :
258 : : /* Emit insns to set X from Y. */
259 : : extern rtx_insn *emit_move_insn (rtx, rtx);
260 : : extern rtx_insn *gen_move_insn (rtx, rtx);
261 : :
262 : : /* Emit insns to set X from Y, with no frills. */
263 : : extern rtx_insn *emit_move_insn_1 (rtx, rtx);
264 : :
265 : : extern rtx_insn *emit_move_complex_push (machine_mode, rtx, rtx);
266 : : extern rtx_insn *emit_move_complex_parts (rtx, rtx);
267 : : extern rtx read_complex_part (rtx, bool);
268 : : extern void write_complex_part (rtx, rtx, bool, bool);
269 : : extern rtx read_complex_part (rtx, bool);
270 : : extern rtx emit_move_resolve_push (machine_mode, rtx);
271 : :
272 : : /* Push a block of length SIZE (perhaps variable)
273 : : and return an rtx to address the beginning of the block. */
274 : : extern rtx push_block (rtx, poly_int64, int);
275 : :
276 : : /* Generate code to push something onto the stack, given its mode and type. */
277 : : extern bool emit_push_insn (rtx, machine_mode, tree, rtx, unsigned int,
278 : : int, rtx, poly_int64, rtx, rtx, int, rtx, bool);
279 : :
280 : : /* Extract the accessible bit-range from a COMPONENT_REF. */
281 : : extern void get_bit_range (poly_uint64 *, poly_uint64 *, tree,
282 : : poly_int64 *, tree *);
283 : :
284 : : /* Expand an assignment that stores the value of FROM into TO. */
285 : : extern void expand_assignment (tree, tree, bool);
286 : :
287 : : /* Generate code for computing expression EXP,
288 : : and storing the value into TARGET.
289 : : If SUGGEST_REG is nonzero, copy the value through a register
290 : : and return that register, if that is possible. */
291 : : extern rtx store_expr (tree, rtx, int, bool, bool);
292 : :
293 : : /* Given an rtx that may include add and multiply operations,
294 : : generate them as insns and return a pseudo-reg containing the value.
295 : : Useful after calling expand_expr with 1 as sum_ok. */
296 : : extern rtx force_operand (rtx, rtx);
297 : :
298 : : /* Work horses for expand_expr. */
299 : : extern rtx expand_expr_real (tree, rtx, machine_mode,
300 : : enum expand_modifier, rtx *, bool);
301 : : extern rtx expand_expr_real_1 (tree, rtx, machine_mode,
302 : : enum expand_modifier, rtx *, bool);
303 : : extern rtx expand_expr_real_2 (sepops, rtx, machine_mode,
304 : : enum expand_modifier);
305 : : extern rtx expand_expr_real_gassign (gassign *, rtx, machine_mode,
306 : : enum expand_modifier modifier,
307 : : rtx * = nullptr, bool = false);
308 : :
309 : : /* Generate code for computing expression EXP.
310 : : An rtx for the computed value is returned. The value is never null.
311 : : In the case of a void EXP, const0_rtx is returned. */
312 : : inline rtx
313 : 98524406 : expand_expr (tree exp, rtx target, machine_mode mode,
314 : : enum expand_modifier modifier)
315 : : {
316 : 91536325 : return expand_expr_real (exp, target, mode, modifier, NULL, false);
317 : : }
318 : :
319 : : inline rtx
320 : 21226523 : expand_normal (tree exp)
321 : : {
322 : 21226523 : return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false);
323 : : }
324 : :
325 : :
326 : : /* Return STRING_CST and set offset, size and decl, if the first
327 : : argument corresponds to a string constant. */
328 : : extern tree string_constant (tree, tree *, tree *, tree *);
329 : : /* Similar to string_constant, return a STRING_CST corresponding
330 : : to the value representation of the first argument if it's
331 : : a constant. */
332 : : extern tree byte_representation (tree, tree *, tree *, tree *);
333 : :
334 : : extern enum tree_code maybe_optimize_mod_cmp (enum tree_code, tree *, tree *);
335 : : extern void maybe_optimize_sub_cmp_0 (enum tree_code, tree *, tree *);
336 : :
337 : : /* Two different ways of generating switch statements. */
338 : : extern bool try_casesi (tree, tree, tree, tree, rtx, rtx, rtx,
339 : : profile_probability);
340 : : extern bool try_tablejump (tree, tree, tree, tree, rtx, rtx,
341 : : profile_probability);
342 : :
343 : : extern bool safe_from_p (const_rtx, tree, int);
344 : :
345 : : /* Get the personality libfunc for a function decl. */
346 : : rtx get_personality_function (tree);
347 : :
348 : : /* Determine whether the LEN bytes can be moved by using several move
349 : : instructions. Return nonzero if a call to move_by_pieces should
350 : : succeed. */
351 : : extern bool can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
352 : :
353 : : extern unsigned HOST_WIDE_INT highest_pow2_factor (const_tree);
354 : :
355 : : extern bool categorize_ctor_elements (const_tree, HOST_WIDE_INT *,
356 : : HOST_WIDE_INT *, HOST_WIDE_INT *,
357 : : bool *);
358 : : extern bool immediate_const_ctor_p (const_tree, unsigned int words = 1);
359 : : extern void store_constructor (tree, rtx, int, poly_int64, bool);
360 : : extern HOST_WIDE_INT int_expr_size (const_tree exp);
361 : :
362 : : extern void expand_operands (tree, tree, rtx, rtx*, rtx*,
363 : : enum expand_modifier);
364 : :
365 : : /* rtl.h and tree.h were included. */
366 : : /* Return an rtx for the size in bytes of the value of an expr. */
367 : : extern rtx expr_size (tree);
368 : :
369 : : extern bool mem_ref_refers_to_non_mem_p (tree);
370 : : extern bool non_mem_decl_p (tree);
371 : :
372 : : #endif /* GCC_EXPR_H */
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