1 ;; Constraint definitions for IA-32 and x86-64.
2 ;; Copyright (C) 2006-2017 Free Software Foundation, Inc.
4 ;; This file is part of GCC.
6 ;; GCC 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 3, or (at your option)
11 ;; GCC 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.
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/>.
24 ;; Integer register constraints.
25 ;; It is not necessary to define 'r' here.
26 (define_register_constraint "R" "LEGACY_REGS"
27 "Legacy register---the eight integer registers available on all
28 i386 processors (@code{a}, @code{b}, @code{c}, @code{d},
29 @code{si}, @code{di}, @code{bp}, @code{sp}).")
31 (define_register_constraint "q" "TARGET_64BIT ? GENERAL_REGS : Q_REGS"
32 "Any register accessible as @code{@var{r}l}. In 32-bit mode, @code{a},
33 @code{b}, @code{c}, and @code{d}; in 64-bit mode, any integer register.")
35 (define_register_constraint "Q" "Q_REGS"
36 "Any register accessible as @code{@var{r}h}: @code{a}, @code{b},
37 @code{c}, and @code{d}.")
39 (define_register_constraint "l" "INDEX_REGS"
40 "@internal Any register that can be used as the index in a base+index
41 memory access: that is, any general register except the stack pointer.")
43 (define_register_constraint "a" "AREG"
44 "The @code{a} register.")
46 (define_register_constraint "b" "BREG"
47 "The @code{b} register.")
49 (define_register_constraint "c" "CREG"
50 "The @code{c} register.")
52 (define_register_constraint "d" "DREG"
53 "The @code{d} register.")
55 (define_register_constraint "S" "SIREG"
56 "The @code{si} register.")
58 (define_register_constraint "D" "DIREG"
59 "The @code{di} register.")
61 (define_register_constraint "A" "AD_REGS"
62 "The @code{a} and @code{d} registers, as a pair (for instructions
63 that return half the result in one and half in the other).")
65 (define_register_constraint "U" "CLOBBERED_REGS"
66 "The call-clobbered integer registers.")
68 ;; Floating-point register constraints.
69 (define_register_constraint "f"
70 "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FLOAT_REGS : NO_REGS"
71 "Any 80387 floating-point (stack) register.")
73 (define_register_constraint "t"
74 "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FP_TOP_REG : NO_REGS"
75 "Top of 80387 floating-point stack (@code{%st(0)}).")
77 (define_register_constraint "u"
78 "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FP_SECOND_REG : NO_REGS"
79 "Second from top of 80387 floating-point stack (@code{%st(1)}).")
81 (define_register_constraint "Yk" "TARGET_AVX512F ? MASK_EVEX_REGS : NO_REGS"
82 "@internal Any mask register that can be used as predicate, i.e. k1-k7.")
84 (define_register_constraint "k" "TARGET_AVX512F ? MASK_REGS : NO_REGS"
85 "@internal Any mask register.")
87 ;; Vector registers (also used for plain floating point nowadays).
88 (define_register_constraint "y" "TARGET_MMX ? MMX_REGS : NO_REGS"
91 (define_register_constraint "x" "TARGET_SSE ? SSE_REGS : NO_REGS"
94 (define_register_constraint "v" "TARGET_SSE ? ALL_SSE_REGS : NO_REGS"
95 "Any EVEX encodable SSE register (@code{%xmm0-%xmm31}).")
97 (define_register_constraint "w" "TARGET_MPX ? BND_REGS : NO_REGS"
98 "@internal Any bound register.")
100 ;; We use the Y prefix to denote any number of conditional register sets:
101 ;; z First SSE register.
102 ;; c SSE inter-unit conversions enabled
103 ;; i SSE2 inter-unit moves to SSE register enabled
104 ;; j SSE2 inter-unit moves from SSE register enabled
105 ;; d any EVEX encodable SSE register for AVX512BW target or any SSE register
106 ;; for SSE4_1 target, when inter-unit moves to SSE register are enabled
107 ;; e any EVEX encodable SSE register for AVX512BW target or any SSE register
108 ;; for SSE4_1 target, when inter-unit moves from SSE register are enabled
109 ;; m MMX inter-unit moves to MMX register enabled
110 ;; n MMX inter-unit moves from MMX register enabled
111 ;; p Integer register when TARGET_PARTIAL_REG_STALL is disabled
112 ;; a Integer register when zero extensions with AND are disabled
113 ;; b Any register that can be used as the GOT base when calling
114 ;; ___tls_get_addr: that is, any general register except EAX
115 ;; and ESP, for -fno-plt if linker supports it. Otherwise,
117 ;; f x87 register when 80387 floating point arithmetic is enabled
118 ;; r SSE regs not requiring REX prefix when prefixes avoidance is enabled
119 ;; and all SSE regs otherwise
120 ;; v any EVEX encodable SSE register for AVX512VL target,
121 ;; otherwise any SSE register
122 ;; h EVEX encodable SSE register with number factor of four
124 (define_register_constraint "Yz" "TARGET_SSE ? SSE_FIRST_REG : NO_REGS"
125 "First SSE register (@code{%xmm0}).")
127 (define_register_constraint "Yc"
128 "TARGET_SSE && TARGET_INTER_UNIT_CONVERSIONS ? ALL_SSE_REGS : NO_REGS"
129 "@internal Any SSE register, when SSE and inter-unit conversions are enabled.")
131 (define_register_constraint "Yi"
132 "TARGET_SSE2 && TARGET_INTER_UNIT_MOVES_TO_VEC ? ALL_SSE_REGS : NO_REGS"
133 "@internal Any SSE register, when SSE2 and inter-unit moves to vector registers are enabled.")
135 (define_register_constraint "Yj"
136 "TARGET_SSE2 && TARGET_INTER_UNIT_MOVES_FROM_VEC ? ALL_SSE_REGS : NO_REGS"
137 "@internal Any SSE register, when SSE2 and inter-unit moves from vector registers are enabled.")
139 (define_register_constraint "Yd"
140 "TARGET_INTER_UNIT_MOVES_TO_VEC
143 : (TARGET_SSE4_1 ? SSE_REGS : NO_REGS))
145 "@internal Any EVEX encodable SSE register (@code{%xmm0-%xmm31}) for AVX512DQ target or any SSE register for SSE4_1 target, when inter-unit moves to vector registers are enabled.")
147 (define_register_constraint "Ye"
148 "TARGET_INTER_UNIT_MOVES_FROM_VEC
151 : (TARGET_SSE4_1 ? SSE_REGS : NO_REGS))
153 "@internal Any EVEX encodable SSE register (@code{%xmm0-%xmm31}) for AVX512DQ target or any SSE register for SSE4_1 target, when inter-unit moves from vector registers are enabled.")
155 (define_register_constraint "Ym"
156 "TARGET_MMX && TARGET_INTER_UNIT_MOVES_TO_VEC ? MMX_REGS : NO_REGS"
157 "@internal Any MMX register, when inter-unit moves to vector registers are enabled.")
159 (define_register_constraint "Yn"
160 "TARGET_MMX && TARGET_INTER_UNIT_MOVES_FROM_VEC ? MMX_REGS : NO_REGS"
161 "@internal Any MMX register, when inter-unit moves from vector registers are enabled.")
163 (define_register_constraint "Yp"
164 "TARGET_PARTIAL_REG_STALL ? NO_REGS : GENERAL_REGS"
165 "@internal Any integer register when TARGET_PARTIAL_REG_STALL is disabled.")
167 (define_register_constraint "Ya"
168 "TARGET_ZERO_EXTEND_WITH_AND && optimize_function_for_speed_p (cfun)
169 ? NO_REGS : GENERAL_REGS"
170 "@internal Any integer register when zero extensions with AND are disabled.")
172 (define_register_constraint "Yb"
173 "(!flag_plt && HAVE_AS_IX86_TLS_GET_ADDR_GOT) ? TLS_GOTBASE_REGS : BREG"
174 "@internal Any register that can be used as the GOT base when calling
175 ___tls_get_addr: that is, any general register except @code{a} and
176 @code{sp} registers, for -fno-plt if linker supports it. Otherwise,
179 (define_register_constraint "Yf"
180 "(ix86_fpmath & FPMATH_387) ? FLOAT_REGS : NO_REGS"
181 "@internal Any x87 register when 80387 FP arithmetic is enabled.")
183 (define_register_constraint "Yr"
184 "TARGET_SSE ? (TARGET_AVOID_4BYTE_PREFIXES ? NO_REX_SSE_REGS : ALL_SSE_REGS) : NO_REGS"
185 "@internal Lower SSE register when avoiding REX prefix and all SSE registers otherwise.")
187 (define_register_constraint "Yv"
188 "TARGET_AVX512VL ? ALL_SSE_REGS : TARGET_SSE ? SSE_REGS : NO_REGS"
189 "@internal For AVX512VL, any EVEX encodable SSE register (@code{%xmm0-%xmm31}), otherwise any SSE register.")
191 (define_register_constraint "Yh" "TARGET_AVX512F ? MOD4_SSE_REGS : NO_REGS"
192 "@internal Any EVEX encodable SSE register, which has number factor of four.")
194 ;; We use the B prefix to denote any number of internal operands:
196 ;; g GOT memory operand.
197 ;; m Vector memory operand
198 ;; c Constant memory operand
199 ;; n Memory operand without REX prefix
200 ;; s Sibcall memory operand, not valid for TARGET_X32
201 ;; w Call memory operand, not valid for TARGET_X32
202 ;; z Constant call address operand.
203 ;; C SSE constant operand.
205 (define_constraint "Bf"
206 "@internal Flags register operand."
207 (match_operand 0 "flags_reg_operand"))
209 (define_constraint "Bg"
210 "@internal GOT memory operand."
211 (match_operand 0 "GOT_memory_operand"))
213 (define_special_memory_constraint "Bm"
214 "@internal Vector memory operand."
215 (match_operand 0 "vector_memory_operand"))
217 (define_special_memory_constraint "Bc"
218 "@internal Constant memory operand."
219 (and (match_operand 0 "memory_operand")
220 (match_test "constant_address_p (XEXP (op, 0))")))
222 (define_special_memory_constraint "Bn"
223 "@internal Memory operand without REX prefix."
224 (match_operand 0 "norex_memory_operand"))
226 (define_constraint "Bs"
227 "@internal Sibcall memory operand."
228 (ior (and (not (match_test "TARGET_X32"))
229 (match_operand 0 "sibcall_memory_operand"))
230 (and (match_test "TARGET_X32 && Pmode == DImode")
231 (match_operand 0 "GOT_memory_operand"))))
233 (define_constraint "Bw"
234 "@internal Call memory operand."
235 (ior (and (not (match_test "TARGET_X32"))
236 (match_operand 0 "memory_operand"))
237 (and (match_test "TARGET_X32 && Pmode == DImode")
238 (match_operand 0 "GOT_memory_operand"))))
240 (define_constraint "Bz"
241 "@internal Constant call address operand."
242 (match_operand 0 "constant_call_address_operand"))
244 (define_constraint "BC"
245 "@internal SSE constant -1 operand."
246 (and (match_test "TARGET_SSE")
247 (ior (match_test "op == constm1_rtx")
248 (match_operand 0 "vector_all_ones_operand"))))
250 ;; Integer constant constraints.
251 (define_constraint "I"
252 "Integer constant in the range 0 @dots{} 31, for 32-bit shifts."
253 (and (match_code "const_int")
254 (match_test "IN_RANGE (ival, 0, 31)")))
256 (define_constraint "J"
257 "Integer constant in the range 0 @dots{} 63, for 64-bit shifts."
258 (and (match_code "const_int")
259 (match_test "IN_RANGE (ival, 0, 63)")))
261 (define_constraint "K"
262 "Signed 8-bit integer constant."
263 (and (match_code "const_int")
264 (match_test "IN_RANGE (ival, -128, 127)")))
266 (define_constraint "L"
267 "@code{0xFF}, @code{0xFFFF} or @code{0xFFFFFFFF}
268 for AND as a zero-extending move."
269 (and (match_code "const_int")
270 (match_test "ival == 0xff || ival == 0xffff
271 || ival == (HOST_WIDE_INT) 0xffffffff")))
273 (define_constraint "M"
274 "0, 1, 2, or 3 (shifts for the @code{lea} instruction)."
275 (and (match_code "const_int")
276 (match_test "IN_RANGE (ival, 0, 3)")))
278 (define_constraint "N"
279 "Unsigned 8-bit integer constant (for @code{in} and @code{out}
281 (and (match_code "const_int")
282 (match_test "IN_RANGE (ival, 0, 255)")))
284 (define_constraint "O"
285 "@internal Integer constant in the range 0 @dots{} 127, for 128-bit shifts."
286 (and (match_code "const_int")
287 (match_test "IN_RANGE (ival, 0, 127)")))
289 ;; Floating-point constant constraints.
290 ;; We allow constants even if TARGET_80387 isn't set, because the
291 ;; stack register converter may need to load 0.0 into the function
292 ;; value register (top of stack).
293 (define_constraint "G"
294 "Standard 80387 floating point constant."
295 (and (match_code "const_double")
296 (match_test "standard_80387_constant_p (op) > 0")))
298 ;; This can theoretically be any mode's CONST0_RTX.
299 (define_constraint "C"
300 "SSE constant zero operand."
301 (and (match_test "TARGET_SSE")
302 (ior (match_test "op == const0_rtx")
303 (match_operand 0 "const0_operand"))))
305 ;; Constant-or-symbol-reference constraints.
307 (define_constraint "e"
308 "32-bit signed integer constant, or a symbolic reference known
309 to fit that range (for immediate operands in sign-extending x86-64
311 (match_operand 0 "x86_64_immediate_operand"))
313 ;; We use W prefix to denote any number of
314 ;; constant-or-symbol-reference constraints
316 (define_constraint "We"
317 "32-bit signed integer constant, or a symbolic reference known
318 to fit that range (for sign-extending conversion operations that
319 require non-VOIDmode immediate operands)."
320 (and (match_operand 0 "x86_64_immediate_operand")
321 (match_test "GET_MODE (op) != VOIDmode")))
323 (define_constraint "Wz"
324 "32-bit unsigned integer constant, or a symbolic reference known
325 to fit that range (for zero-extending conversion operations that
326 require non-VOIDmode immediate operands)."
327 (and (match_operand 0 "x86_64_zext_immediate_operand")
328 (match_test "GET_MODE (op) != VOIDmode")))
330 (define_constraint "Wd"
331 "128-bit integer constant where both the high and low 64-bit word
332 of it satisfies the e constraint."
333 (match_operand 0 "x86_64_hilo_int_operand"))
335 (define_constraint "Z"
336 "32-bit unsigned integer constant, or a symbolic reference known
337 to fit that range (for immediate operands in zero-extending x86-64
339 (match_operand 0 "x86_64_zext_immediate_operand"))
341 ;; T prefix is used for different address constraints
343 ;; s - address with no segment register
344 ;; i - address with no index and no rip
345 ;; b - address with no base and no rip
347 (define_address_constraint "Tv"
348 "VSIB address operand"
349 (match_operand 0 "vsib_address_operand"))
351 (define_address_constraint "Ts"
352 "Address operand without segment register"
353 (match_operand 0 "address_no_seg_operand"))
355 (define_address_constraint "Ti"
356 "MPX address operand without index"
357 (match_operand 0 "address_mpx_no_index_operand"))
359 (define_address_constraint "Tb"
360 "MPX address operand without base"
361 (match_operand 0 "address_mpx_no_base_operand"))