1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987-2018 Free Software Foundation, Inc.
4 This file is part of GCC.
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
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
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/>. */
23 /* This is the 4th arg to `expand_expr'.
24 EXPAND_STACK_PARM means we are possibly expanding a call param onto
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
,
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)
42 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
44 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
46 /* This structure is used to pass around information about exploded
47 unary, binary and trinary expressions between expand_expr_real_1 and
49 typedef struct separate_ops
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);
61 /* This is run at the start of compiling a function. */
62 extern void init_expr (void);
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);
68 /* Convert an rtx to specified machine mode and return the result. */
69 extern rtx
convert_to_mode (machine_mode
, rtx
, int);
71 /* Convert an rtx to MODE from OLDMODE and return the result. */
72 extern rtx
convert_modes (machine_mode
, machine_mode
, rtx
, int);
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
,
79 emit_block_copy_via_libcall (rtx dst
, rtx src
, rtx size
, bool tailcall
= false)
81 return emit_block_op_via_libcall (BUILT_IN_MEMCPY
, dst
, src
, size
, tailcall
);
85 emit_block_move_via_libcall (rtx dst
, rtx src
, rtx size
, bool tailcall
= false)
87 return emit_block_op_via_libcall (BUILT_IN_MEMMOVE
, dst
, src
, size
, tailcall
);
91 emit_block_comp_via_libcall (rtx dst
, rtx src
, rtx size
, bool tailcall
= false)
93 return emit_block_op_via_libcall (BUILT_IN_MEMCMP
, dst
, src
, size
, tailcall
);
96 /* Emit code to move a block Y to a block X. */
102 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
106 typedef rtx (*by_pieces_constfn
) (void *, HOST_WIDE_INT
, scalar_int_mode
);
108 extern rtx
emit_block_move (rtx
, rtx
, rtx
, enum block_op_methods
);
109 extern rtx
emit_block_move_hints (rtx
, rtx
, rtx
, enum block_op_methods
,
110 unsigned int, HOST_WIDE_INT
,
111 unsigned HOST_WIDE_INT
,
112 unsigned HOST_WIDE_INT
,
113 unsigned HOST_WIDE_INT
);
114 extern rtx
emit_block_cmp_hints (rtx
, rtx
, rtx
, tree
, rtx
, bool,
115 by_pieces_constfn
, void *);
116 extern bool emit_storent_insn (rtx to
, rtx from
);
118 /* Copy all or part of a value X into registers starting at REGNO.
119 The number of registers to be filled is NREGS. */
120 extern void move_block_to_reg (int, rtx
, int, machine_mode
);
122 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
123 The number of registers to be filled is NREGS. */
124 extern void move_block_from_reg (int, rtx
, int);
126 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
127 extern rtx
gen_group_rtx (rtx
);
129 /* Load a BLKmode value into non-consecutive registers represented by a
131 extern void emit_group_load (rtx
, rtx
, tree
, poly_int64
);
133 /* Similarly, but load into new temporaries. */
134 extern rtx
emit_group_load_into_temps (rtx
, rtx
, tree
, poly_int64
);
136 /* Move a non-consecutive group of registers represented by a PARALLEL into
137 a non-consecutive group of registers represented by a PARALLEL. */
138 extern void emit_group_move (rtx
, rtx
);
140 /* Move a group of registers represented by a PARALLEL into pseudos. */
141 extern rtx
emit_group_move_into_temps (rtx
);
143 /* Store a BLKmode value from non-consecutive registers represented by a
145 extern void emit_group_store (rtx
, rtx
, tree
, poly_int64
);
147 extern rtx
maybe_emit_group_store (rtx
, tree
);
149 /* Mark REG as holding a parameter for the next CALL_INSN.
150 Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */
151 extern void use_reg_mode (rtx
*, rtx
, machine_mode
);
152 extern void clobber_reg_mode (rtx
*, rtx
, machine_mode
);
154 extern rtx
copy_blkmode_to_reg (machine_mode
, tree
);
156 /* Mark REG as holding a parameter for the next CALL_INSN. */
158 use_reg (rtx
*fusage
, rtx reg
)
160 use_reg_mode (fusage
, reg
, VOIDmode
);
163 /* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE. */
165 clobber_reg (rtx
*fusage
, rtx reg
)
167 clobber_reg_mode (fusage
, reg
, VOIDmode
);
170 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
171 for the next CALL_INSN. */
172 extern void use_regs (rtx
*, int, int);
174 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
175 extern void use_group_regs (rtx
*, rtx
);
177 #ifdef GCC_INSN_CODES_H
178 extern rtx
expand_cmpstrn_or_cmpmem (insn_code
, rtx
, rtx
, rtx
, tree
, rtx
,
182 /* Write zeros through the storage of OBJECT.
183 If OBJECT has BLKmode, SIZE is its length in bytes. */
184 extern rtx
clear_storage (rtx
, rtx
, enum block_op_methods
);
185 extern rtx
clear_storage_hints (rtx
, rtx
, enum block_op_methods
,
186 unsigned int, HOST_WIDE_INT
,
187 unsigned HOST_WIDE_INT
,
188 unsigned HOST_WIDE_INT
,
189 unsigned HOST_WIDE_INT
);
190 /* The same, but always output an library call. */
191 extern rtx
set_storage_via_libcall (rtx
, rtx
, rtx
, bool = false);
193 /* Expand a setmem pattern; return true if successful. */
194 extern bool set_storage_via_setmem (rtx
, rtx
, rtx
, unsigned int,
195 unsigned int, HOST_WIDE_INT
,
196 unsigned HOST_WIDE_INT
,
197 unsigned HOST_WIDE_INT
,
198 unsigned HOST_WIDE_INT
);
200 /* Return nonzero if it is desirable to store LEN bytes generated by
201 CONSTFUN with several move instructions by store_by_pieces
202 function. CONSTFUNDATA is a pointer which will be passed as argument
203 in every CONSTFUN call.
204 ALIGN is maximum alignment we can assume.
205 MEMSETP is true if this is a real memset/bzero, not a copy
206 of a const string. */
207 extern int can_store_by_pieces (unsigned HOST_WIDE_INT
,
209 void *, unsigned int, bool);
211 /* Generate several move instructions to store LEN bytes generated by
212 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
213 pointer which will be passed as argument in every CONSTFUN call.
214 ALIGN is maximum alignment we can assume.
215 MEMSETP is true if this is a real memset/bzero, not a copy.
217 extern rtx
store_by_pieces (rtx
, unsigned HOST_WIDE_INT
, by_pieces_constfn
,
218 void *, unsigned int, bool, int);
220 /* Emit insns to set X from Y. */
221 extern rtx_insn
*emit_move_insn (rtx
, rtx
);
222 extern rtx_insn
*gen_move_insn (rtx
, rtx
);
224 /* Emit insns to set X from Y, with no frills. */
225 extern rtx_insn
*emit_move_insn_1 (rtx
, rtx
);
227 extern rtx_insn
*emit_move_complex_push (machine_mode
, rtx
, rtx
);
228 extern rtx_insn
*emit_move_complex_parts (rtx
, rtx
);
229 extern rtx
read_complex_part (rtx
, bool);
230 extern void write_complex_part (rtx
, rtx
, bool);
231 extern rtx
read_complex_part (rtx
, bool);
232 extern rtx
emit_move_resolve_push (machine_mode
, rtx
);
234 /* Push a block of length SIZE (perhaps variable)
235 and return an rtx to address the beginning of the block. */
236 extern rtx
push_block (rtx
, poly_int64
, int);
238 /* Generate code to push something onto the stack, given its mode and type. */
239 extern bool emit_push_insn (rtx
, machine_mode
, tree
, rtx
, unsigned int,
240 int, rtx
, poly_int64
, rtx
, rtx
, int, rtx
, bool);
242 /* Extract the accessible bit-range from a COMPONENT_REF. */
243 extern void get_bit_range (poly_uint64_pod
*, poly_uint64_pod
*, tree
,
244 poly_int64_pod
*, tree
*);
246 /* Expand an assignment that stores the value of FROM into TO. */
247 extern void expand_assignment (tree
, tree
, bool);
249 /* Generate code for computing expression EXP,
250 and storing the value into TARGET.
251 If SUGGEST_REG is nonzero, copy the value through a register
252 and return that register, if that is possible. */
253 extern rtx
store_expr_with_bounds (tree
, rtx
, int, bool, bool, tree
);
254 extern rtx
store_expr (tree
, rtx
, int, bool, bool);
256 /* Given an rtx that may include add and multiply operations,
257 generate them as insns and return a pseudo-reg containing the value.
258 Useful after calling expand_expr with 1 as sum_ok. */
259 extern rtx
force_operand (rtx
, rtx
);
261 /* Work horses for expand_expr. */
262 extern rtx
expand_expr_real (tree
, rtx
, machine_mode
,
263 enum expand_modifier
, rtx
*, bool);
264 extern rtx
expand_expr_real_1 (tree
, rtx
, machine_mode
,
265 enum expand_modifier
, rtx
*, bool);
266 extern rtx
expand_expr_real_2 (sepops
, rtx
, machine_mode
,
267 enum expand_modifier
);
269 /* Generate code for computing expression EXP.
270 An rtx for the computed value is returned. The value is never null.
271 In the case of a void EXP, const0_rtx is returned. */
273 expand_expr (tree exp
, rtx target
, machine_mode mode
,
274 enum expand_modifier modifier
)
276 return expand_expr_real (exp
, target
, mode
, modifier
, NULL
, false);
280 expand_normal (tree exp
)
282 return expand_expr_real (exp
, NULL_RTX
, VOIDmode
, EXPAND_NORMAL
, NULL
, false);
286 /* Return the tree node and offset if a given argument corresponds to
287 a string constant. */
288 extern tree
string_constant (tree
, tree
*);
290 /* Two different ways of generating switch statements. */
291 extern int try_casesi (tree
, tree
, tree
, tree
, rtx
, rtx
, rtx
, profile_probability
);
292 extern int try_tablejump (tree
, tree
, tree
, tree
, rtx
, rtx
, profile_probability
);
294 extern int safe_from_p (const_rtx
, tree
, int);
296 /* Get the personality libfunc for a function decl. */
297 rtx
get_personality_function (tree
);
299 /* Determine whether the LEN bytes can be moved by using several move
300 instructions. Return nonzero if a call to move_by_pieces should
302 extern bool can_move_by_pieces (unsigned HOST_WIDE_INT
, unsigned int);
304 extern unsigned HOST_WIDE_INT
highest_pow2_factor (const_tree
);
306 extern bool categorize_ctor_elements (const_tree
, HOST_WIDE_INT
*,
307 HOST_WIDE_INT
*, bool *);
309 extern void expand_operands (tree
, tree
, rtx
, rtx
*, rtx
*,
310 enum expand_modifier
);
312 /* rtl.h and tree.h were included. */
313 /* Return an rtx for the size in bytes of the value of an expr. */
314 extern rtx
expr_size (tree
);
316 #endif /* GCC_EXPR_H */