1 ;; Constraint definitions for RS6000
2 ;; Copyright (C) 2006-2018 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/>.
20 ;; Available constraint letters: e k q t u A B C D S T
22 ;; Register constraints
24 (define_register_constraint "f" "rs6000_constraints[RS6000_CONSTRAINT_f]"
27 (define_register_constraint "d" "rs6000_constraints[RS6000_CONSTRAINT_d]"
30 (define_register_constraint "b" "BASE_REGS"
33 (define_register_constraint "h" "SPECIAL_REGS"
36 (define_register_constraint "c" "CTR_REGS"
39 (define_register_constraint "l" "LINK_REGS"
42 (define_register_constraint "v" "ALTIVEC_REGS"
45 (define_register_constraint "x" "CR0_REGS"
48 (define_register_constraint "y" "CR_REGS"
51 (define_register_constraint "z" "CA_REGS"
54 ;; Use w as a prefix to add VSX modes
56 (define_register_constraint "wa" "rs6000_constraints[RS6000_CONSTRAINT_wa]"
57 "Any VSX register if the -mvsx option was used or NO_REGS.")
59 (define_register_constraint "wb" "rs6000_constraints[RS6000_CONSTRAINT_wb]"
60 "Altivec register if the -mpower9-dform option was used or NO_REGS.")
62 ;; NOTE: For compatibility, "wc" is reserved to represent individual CR bits.
63 ;; It is currently used for that purpose in LLVM.
65 (define_register_constraint "wd" "rs6000_constraints[RS6000_CONSTRAINT_wd]"
66 "VSX vector register to hold vector double data or NO_REGS.")
68 (define_register_constraint "we" "rs6000_constraints[RS6000_CONSTRAINT_we]"
69 "VSX register if the -mpower9-vector -m64 options were used or NO_REGS.")
71 (define_register_constraint "wf" "rs6000_constraints[RS6000_CONSTRAINT_wf]"
72 "VSX vector register to hold vector float data or NO_REGS.")
74 (define_register_constraint "wg" "rs6000_constraints[RS6000_CONSTRAINT_wg]"
75 "If -mmfpgpr was used, a floating point register or NO_REGS.")
77 (define_register_constraint "wh" "rs6000_constraints[RS6000_CONSTRAINT_wh]"
78 "Floating point register if direct moves are available, or NO_REGS.")
80 (define_register_constraint "wi" "rs6000_constraints[RS6000_CONSTRAINT_wi]"
81 "FP or VSX register to hold 64-bit integers for VSX insns or NO_REGS.")
83 (define_register_constraint "wj" "rs6000_constraints[RS6000_CONSTRAINT_wj]"
84 "FP or VSX register to hold 64-bit integers for direct moves or NO_REGS.")
86 (define_register_constraint "wk" "rs6000_constraints[RS6000_CONSTRAINT_wk]"
87 "FP or VSX register to hold 64-bit doubles for direct moves or NO_REGS.")
89 (define_register_constraint "wl" "rs6000_constraints[RS6000_CONSTRAINT_wl]"
90 "Floating point register if the LFIWAX instruction is enabled or NO_REGS.")
92 (define_register_constraint "wm" "rs6000_constraints[RS6000_CONSTRAINT_wm]"
93 "VSX register if direct move instructions are enabled, or NO_REGS.")
95 ;; NO_REGs register constraint, used to merge mov{sd,sf}, since movsd can use
96 ;; direct move directly, and movsf can't to move between the register sets.
97 ;; There is a mode_attr that resolves to wm for SDmode and wn for SFmode
98 (define_register_constraint "wn" "NO_REGS" "No register (NO_REGS).")
100 (define_register_constraint "wo" "rs6000_constraints[RS6000_CONSTRAINT_wo]"
101 "VSX register if the -mpower9-vector option was used or NO_REGS.")
103 (define_register_constraint "wp" "rs6000_constraints[RS6000_CONSTRAINT_wp]"
104 "VSX register to use for IEEE 128-bit fp TFmode, or NO_REGS.")
106 (define_register_constraint "wq" "rs6000_constraints[RS6000_CONSTRAINT_wq]"
107 "VSX register to use for IEEE 128-bit fp KFmode, or NO_REGS.")
109 (define_register_constraint "wr" "rs6000_constraints[RS6000_CONSTRAINT_wr]"
110 "General purpose register if 64-bit instructions are enabled or NO_REGS.")
112 (define_register_constraint "ws" "rs6000_constraints[RS6000_CONSTRAINT_ws]"
113 "VSX vector register to hold scalar double values or NO_REGS.")
115 (define_register_constraint "wt" "rs6000_constraints[RS6000_CONSTRAINT_wt]"
116 "VSX vector register to hold 128 bit integer or NO_REGS.")
118 (define_register_constraint "wu" "rs6000_constraints[RS6000_CONSTRAINT_wu]"
119 "Altivec register to use for float/32-bit int loads/stores or NO_REGS.")
121 (define_register_constraint "wv" "rs6000_constraints[RS6000_CONSTRAINT_wv]"
122 "Altivec register to use for double loads/stores or NO_REGS.")
124 (define_register_constraint "ww" "rs6000_constraints[RS6000_CONSTRAINT_ww]"
125 "FP or VSX register to perform float operations under -mvsx or NO_REGS.")
127 (define_register_constraint "wx" "rs6000_constraints[RS6000_CONSTRAINT_wx]"
128 "Floating point register if the STFIWX instruction is enabled or NO_REGS.")
130 (define_register_constraint "wy" "rs6000_constraints[RS6000_CONSTRAINT_wy]"
131 "FP or VSX register to perform ISA 2.07 float ops or NO_REGS.")
133 (define_register_constraint "wz" "rs6000_constraints[RS6000_CONSTRAINT_wz]"
134 "Floating point register if the LFIWZX instruction is enabled or NO_REGS.")
136 (define_register_constraint "wA" "rs6000_constraints[RS6000_CONSTRAINT_wA]"
137 "BASE_REGS if 64-bit instructions are enabled or NO_REGS.")
139 ;; wB needs ISA 2.07 VUPKHSW
140 (define_constraint "wB"
141 "Signed 5-bit constant integer that can be loaded into an altivec register."
142 (and (match_code "const_int")
143 (and (match_test "TARGET_P8_VECTOR")
144 (match_operand 0 "s5bit_cint_operand"))))
146 (define_constraint "wD"
147 "Int constant that is the element number of the 64-bit scalar in a vector."
148 (and (match_code "const_int")
149 (match_test "TARGET_VSX && (ival == VECTOR_ELEMENT_SCALAR_64BIT)")))
151 (define_constraint "wE"
152 "Vector constant that can be loaded with the XXSPLTIB instruction."
153 (match_test "xxspltib_constant_nosplit (op, mode)"))
155 ;; Extended fusion store
156 (define_memory_constraint "wF"
157 "Memory operand suitable for power8 GPR load fusion"
158 (match_operand 0 "fusion_addis_mem_combo_load"))
160 (define_register_constraint "wH" "rs6000_constraints[RS6000_CONSTRAINT_wH]"
161 "Altivec register to hold 32-bit integers or NO_REGS.")
163 (define_register_constraint "wI" "rs6000_constraints[RS6000_CONSTRAINT_wI]"
164 "FPR register to hold 32-bit integers or NO_REGS.")
166 (define_register_constraint "wJ" "rs6000_constraints[RS6000_CONSTRAINT_wJ]"
167 "FPR register to hold 8/16-bit integers or NO_REGS.")
169 (define_register_constraint "wK" "rs6000_constraints[RS6000_CONSTRAINT_wK]"
170 "Altivec register to hold 8/16-bit integers or NO_REGS.")
172 (define_constraint "wL"
173 "Int constant that is the element number mfvsrld accesses in a vector."
174 (and (match_code "const_int")
175 (and (match_test "TARGET_DIRECT_MOVE_128")
176 (match_test "(ival == VECTOR_ELEMENT_MFVSRLD_64BIT)"))))
178 ;; Generate the XXORC instruction to set a register to all 1's
179 (define_constraint "wM"
180 "Match vector constant with all 1's if the XXLORC instruction is available"
181 (and (match_test "TARGET_P8_VECTOR")
182 (match_operand 0 "all_ones_constant")))
184 ;; ISA 3.0 vector d-form addresses
185 (define_memory_constraint "wO"
186 "Memory operand suitable for the ISA 3.0 vector d-form instructions."
187 (match_operand 0 "vsx_quad_dform_memory_operand"))
189 ;; Lq/stq validates the address for load/store quad
190 (define_memory_constraint "wQ"
191 "Memory operand suitable for the load/store quad instructions"
192 (match_operand 0 "quad_memory_operand"))
194 (define_constraint "wS"
195 "Vector constant that can be loaded with XXSPLTIB & sign extension."
196 (match_test "xxspltib_constant_split (op, mode)"))
198 ;; ISA 3.0 DS-form instruction that has the bottom 2 bits 0 and no update form.
199 ;; Used by LXSD/STXSD/LXSSP/STXSSP. In contrast to "Y", the multiple-of-four
200 ;; offset is enforced for 32-bit too.
201 (define_memory_constraint "wY"
202 "Offsettable memory operand, with bottom 2 bits 0"
203 (and (match_code "mem")
204 (not (match_test "update_address_mem (op, mode)"))
205 (match_test "mem_operand_ds_form (op, mode)")))
207 ;; Altivec style load/store that ignores the bottom bits of the address
208 (define_memory_constraint "wZ"
209 "Indexed or indirect memory operand, ignoring the bottom 4 bits"
210 (match_operand 0 "altivec_indexed_or_indirect_operand"))
212 ;; Integer constraints
214 (define_constraint "I"
215 "A signed 16-bit constant"
216 (and (match_code "const_int")
217 (match_test "((unsigned HOST_WIDE_INT) ival + 0x8000) < 0x10000")))
219 (define_constraint "J"
220 "high-order 16 bits nonzero"
221 (and (match_code "const_int")
222 (match_test "(ival & (~ (unsigned HOST_WIDE_INT) 0xffff0000)) == 0")))
224 (define_constraint "K"
225 "low-order 16 bits nonzero"
226 (and (match_code "const_int")
227 (match_test "(ival & (~ (HOST_WIDE_INT) 0xffff)) == 0")))
229 (define_constraint "L"
230 "signed 16-bit constant shifted left 16 bits"
231 (and (match_code "const_int")
232 (match_test "((ival & 0xffff) == 0
233 && (ival >> 31 == -1 || ival >> 31 == 0))")))
235 (define_constraint "M"
236 "constant greater than 31"
237 (and (match_code "const_int")
238 (match_test "ival > 31")))
240 (define_constraint "N"
241 "positive constant that is an exact power of two"
242 (and (match_code "const_int")
243 (match_test "ival > 0 && exact_log2 (ival) >= 0")))
245 (define_constraint "O"
247 (and (match_code "const_int")
248 (match_test "ival == 0")))
250 (define_constraint "P"
251 "constant whose negation is signed 16-bit constant"
252 (and (match_code "const_int")
253 (match_test "((- (unsigned HOST_WIDE_INT) ival) + 0x8000) < 0x10000")))
255 ;; Floating-point constraints. These two are defined so that insn
256 ;; length attributes can be calculated exactly.
258 (define_constraint "G"
259 "Constant that can be copied into GPR with two insns for DF/DD
261 (and (match_code "const_double")
262 (match_test "num_insns_constant (op, mode)
263 == (mode == SFmode || mode == SDmode ? 1 : 2)")))
265 (define_constraint "H"
266 "DF/DD constant that takes three insns."
267 (and (match_code "const_double")
268 (match_test "num_insns_constant (op, mode) == 3")))
270 ;; Memory constraints
272 (define_memory_constraint "es"
273 "A ``stable'' memory operand; that is, one which does not include any
274 automodification of the base register. Unlike @samp{m}, this constraint
275 can be used in @code{asm} statements that might access the operand
276 several times, or that might not access it at all."
277 (and (match_code "mem")
278 (match_test "GET_RTX_CLASS (GET_CODE (XEXP (op, 0))) != RTX_AUTOINC")))
280 (define_memory_constraint "Q"
281 "Memory operand that is an offset from a register (it is usually better
282 to use @samp{m} or @samp{es} in @code{asm} statements)"
283 (and (match_code "mem")
284 (match_test "GET_CODE (XEXP (op, 0)) == REG")))
286 (define_memory_constraint "Y"
287 "memory operand for 8 byte and 16 byte gpr load/store"
288 (and (match_code "mem")
289 (match_test "mem_operand_gpr (op, mode)")))
291 (define_memory_constraint "Z"
292 "Memory operand that is an indexed or indirect from a register (it is
293 usually better to use @samp{m} or @samp{es} in @code{asm} statements)"
294 (match_operand 0 "indexed_or_indirect_operand"))
296 ;; Address constraints
298 (define_address_constraint "a"
299 "Indexed or indirect address operand"
300 (match_operand 0 "indexed_or_indirect_address"))
302 (define_constraint "R"
304 (match_test "legitimate_constant_pool_address_p (op, QImode, false)"))
306 ;; General constraints
308 (define_constraint "U"
309 "V.4 small data reference"
310 (and (match_test "DEFAULT_ABI == ABI_V4")
311 (match_test "small_data_operand (op, mode)")))
313 (define_constraint "W"
314 "vector constant that does not require memory"
315 (match_operand 0 "easy_vector_constant"))
317 (define_constraint "j"
318 "Zero vector constant"
319 (match_test "op == const0_rtx || op == CONST0_RTX (mode)"))