1 ;; GCC machine description for IA-64 synchronization instructions.
2 ;; Copyright (C) 2005-2025 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 ;; Conversion to C++11 memory model based on
21 ;; http://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html
23 (define_mode_iterator IMODE [QI HI SI DI])
24 (define_mode_iterator I124MODE [QI HI SI])
25 (define_mode_iterator I48MODE [SI DI])
26 (define_mode_attr modesuffix [(QI "1") (HI "2") (SI "4") (DI "8")])
28 (define_code_iterator FETCHOP [plus minus ior xor and])
29 (define_code_attr fetchop_name
30 [(plus "add") (minus "sub") (ior "or") (xor "xor") (and "and")])
32 (define_expand "mem_thread_fence"
33 [(match_operand:SI 0 "const_int_operand" "")] ;; model
36 if (is_mm_seq_cst (memmodel_from_int (INTVAL (operands[0]))))
37 emit_insn (gen_memory_barrier ());
41 (define_expand "memory_barrier"
43 (unspec:BLK [(match_dup 0)] UNSPEC_MF))]
46 operands[0] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode));
47 MEM_VOLATILE_P (operands[0]) = 1;
50 (define_insn "*memory_barrier"
51 [(set (match_operand:BLK 0 "" "")
52 (unspec:BLK [(match_dup 0)] UNSPEC_MF))]
55 [(set_attr "itanium_class" "syst_m")])
57 (define_expand "atomic_load<mode>"
58 [(match_operand:IMODE 0 "gr_register_operand" "") ;; output
59 (match_operand:IMODE 1 "memory_operand" "") ;; memory
60 (match_operand:SI 2 "const_int_operand" "")] ;; model
63 enum memmodel model = memmodel_from_int (INTVAL (operands[2]));
65 /* Unless the memory model is relaxed, we want to emit ld.acq, which
66 will happen automatically for volatile memories. */
67 gcc_assert (is_mm_relaxed (model) || MEM_VOLATILE_P (operands[1]));
68 emit_move_insn (operands[0], operands[1]);
72 (define_expand "atomic_store<mode>"
73 [(match_operand:IMODE 0 "memory_operand" "") ;; memory
74 (match_operand:IMODE 1 "gr_reg_or_0_operand" "") ;; input
75 (match_operand:SI 2 "const_int_operand" "")] ;; model
78 enum memmodel model = memmodel_from_int (INTVAL (operands[2]));
80 /* Unless the memory model is relaxed, we want to emit st.rel, which
81 will happen automatically for volatile memories. */
82 gcc_assert (is_mm_relaxed (model) || MEM_VOLATILE_P (operands[0]));
83 emit_move_insn (operands[0], operands[1]);
85 /* Sequentially consistent stores need a subsequent MF. See
86 http://www.decadent.org.uk/pipermail/cpp-threads/2008-December/001952.html
87 for a discussion of why a MF is needed here, but not for atomic_load. */
88 if (is_mm_seq_cst (model))
89 emit_insn (gen_memory_barrier ());
93 (define_expand "atomic_compare_and_swap<mode>"
94 [(match_operand:DI 0 "gr_register_operand" "") ;; bool out
95 (match_operand:IMODE 1 "gr_register_operand" "") ;; val out
96 (match_operand:IMODE 2 "not_postinc_memory_operand" "") ;; memory
97 (match_operand:IMODE 3 "gr_register_operand" "") ;; expected
98 (match_operand:IMODE 4 "gr_reg_or_0_operand" "") ;; desired
99 (match_operand:SI 5 "const_int_operand" "") ;; is_weak
100 (match_operand:SI 6 "const_int_operand" "") ;; succ model
101 (match_operand:SI 7 "const_int_operand" "")] ;; fail model
104 /* No need to distinquish __sync from __atomic, so get base value. */
105 enum memmodel model = memmodel_base (INTVAL (operands[6]));
106 rtx ccv = gen_rtx_REG (DImode, AR_CCV_REGNUM);
109 eval = gen_reg_rtx (DImode);
110 convert_move (eval, operands[3], 1);
111 emit_move_insn (ccv, eval);
113 if (<MODE>mode == DImode)
116 dval = gen_reg_rtx (DImode);
120 case MEMMODEL_RELAXED:
121 case MEMMODEL_ACQUIRE:
122 case MEMMODEL_CONSUME:
123 emit_insn (gen_cmpxchg_acq_<mode> (dval, operands[2], ccv, operands[4]));
125 case MEMMODEL_RELEASE:
126 emit_insn (gen_cmpxchg_rel_<mode> (dval, operands[2], ccv, operands[4]));
128 case MEMMODEL_ACQ_REL:
129 case MEMMODEL_SEQ_CST:
130 emit_insn (gen_cmpxchg_rel_<mode> (dval, operands[2], ccv, operands[4]));
131 emit_insn (gen_memory_barrier ());
137 if (<MODE>mode != DImode)
138 emit_move_insn (operands[1], gen_lowpart (<MODE>mode, dval));
140 emit_insn (gen_cstoredi4 (operands[0], gen_rtx_EQ (DImode, dval, eval),
145 (define_insn "cmpxchg_acq_<mode>"
146 [(set (match_operand:DI 0 "gr_register_operand" "=r")
148 (match_operand:I124MODE 1 "not_postinc_memory_operand" "+S")))
152 (match_operand:DI 2 "ar_ccv_reg_operand" "")
153 (match_operand:I124MODE 3 "gr_reg_or_0_operand" "rO")]
154 UNSPEC_CMPXCHG_ACQ))]
156 "cmpxchg<modesuffix>.acq %0 = %1, %r3, %2"
157 [(set_attr "itanium_class" "sem")])
159 (define_insn "cmpxchg_rel_<mode>"
160 [(set (match_operand:DI 0 "gr_register_operand" "=r")
162 (match_operand:I124MODE 1 "not_postinc_memory_operand" "+S")))
166 (match_operand:DI 2 "ar_ccv_reg_operand" "")
167 (match_operand:I124MODE 3 "gr_reg_or_0_operand" "rO")]
168 UNSPEC_CMPXCHG_REL))]
170 "cmpxchg<modesuffix>.rel %0 = %1, %r3, %2"
171 [(set_attr "itanium_class" "sem")])
173 (define_insn "cmpxchg_acq_di"
174 [(set (match_operand:DI 0 "gr_register_operand" "=r")
175 (match_operand:DI 1 "not_postinc_memory_operand" "+S"))
177 (unspec:DI [(match_dup 1)
178 (match_operand:DI 2 "ar_ccv_reg_operand" "")
179 (match_operand:DI 3 "gr_reg_or_0_operand" "rO")]
180 UNSPEC_CMPXCHG_ACQ))]
182 "cmpxchg8.acq %0 = %1, %r3, %2"
183 [(set_attr "itanium_class" "sem")])
185 (define_insn "cmpxchg_rel_di"
186 [(set (match_operand:DI 0 "gr_register_operand" "=r")
187 (match_operand:DI 1 "not_postinc_memory_operand" "+S"))
189 (unspec:DI [(match_dup 1)
190 (match_operand:DI 2 "ar_ccv_reg_operand" "")
191 (match_operand:DI 3 "gr_reg_or_0_operand" "rO")]
192 UNSPEC_CMPXCHG_REL))]
194 "cmpxchg8.rel %0 = %1, %r3, %2"
195 [(set_attr "itanium_class" "sem")])
197 (define_expand "atomic_exchange<mode>"
198 [(match_operand:IMODE 0 "gr_register_operand" "") ;; output
199 (match_operand:IMODE 1 "not_postinc_memory_operand" "") ;; memory
200 (match_operand:IMODE 2 "gr_reg_or_0_operand" "") ;; input
201 (match_operand:SI 3 "const_int_operand" "")] ;; succ model
204 /* No need to distinquish __sync from __atomic, so get base value. */
205 enum memmodel model = memmodel_base (INTVAL (operands[3]));
209 case MEMMODEL_RELAXED:
210 case MEMMODEL_ACQUIRE:
211 case MEMMODEL_CONSUME:
213 case MEMMODEL_RELEASE:
214 case MEMMODEL_ACQ_REL:
215 case MEMMODEL_SEQ_CST:
216 emit_insn (gen_memory_barrier ());
221 emit_insn (gen_xchg_acq_<mode> (operands[0], operands[1], operands[2]));
225 ;; Note that XCHG is always memory model acquire.
226 (define_insn "xchg_acq_<mode>"
227 [(set (match_operand:IMODE 0 "gr_register_operand" "=r")
228 (match_operand:IMODE 1 "not_postinc_memory_operand" "+S"))
230 (match_operand:IMODE 2 "gr_reg_or_0_operand" "rO"))]
232 "xchg<modesuffix> %0 = %1, %r2"
233 [(set_attr "itanium_class" "sem")])
235 (define_expand "atomic_<fetchop_name><mode>"
236 [(set (match_operand:IMODE 0 "memory_operand" "")
237 (FETCHOP:IMODE (match_dup 0)
238 (match_operand:IMODE 1 "nonmemory_operand" "")))
239 (use (match_operand:SI 2 "const_int_operand" ""))]
242 ia64_expand_atomic_op (<CODE>, operands[0], operands[1], NULL, NULL,
243 (enum memmodel) INTVAL (operands[2]));
247 (define_expand "atomic_nand<mode>"
248 [(set (match_operand:IMODE 0 "memory_operand" "")
250 (and:IMODE (match_dup 0)
251 (match_operand:IMODE 1 "nonmemory_operand" ""))))
252 (use (match_operand:SI 2 "const_int_operand" ""))]
255 ia64_expand_atomic_op (NOT, operands[0], operands[1], NULL, NULL,
256 (enum memmodel) INTVAL (operands[2]));
260 (define_expand "atomic_fetch_<fetchop_name><mode>"
261 [(set (match_operand:IMODE 0 "gr_register_operand" "")
263 (match_operand:IMODE 1 "memory_operand" "")
264 (match_operand:IMODE 2 "nonmemory_operand" "")))
265 (use (match_operand:SI 3 "const_int_operand" ""))]
268 ia64_expand_atomic_op (<CODE>, operands[1], operands[2], operands[0], NULL,
269 (enum memmodel) INTVAL (operands[3]));
273 (define_expand "atomic_fetch_nand<mode>"
274 [(set (match_operand:IMODE 0 "gr_register_operand" "")
276 (and:IMODE (match_operand:IMODE 1 "memory_operand" "")
277 (match_operand:IMODE 2 "nonmemory_operand" ""))))
278 (use (match_operand:SI 3 "const_int_operand" ""))]
281 ia64_expand_atomic_op (NOT, operands[1], operands[2], operands[0], NULL,
282 (enum memmodel) INTVAL (operands[3]));
286 (define_expand "atomic_<fetchop_name>_fetch<mode>"
287 [(set (match_operand:IMODE 0 "gr_register_operand" "")
289 (match_operand:IMODE 1 "memory_operand" "")
290 (match_operand:IMODE 2 "nonmemory_operand" "")))
291 (use (match_operand:SI 3 "const_int_operand" ""))]
294 ia64_expand_atomic_op (<CODE>, operands[1], operands[2], NULL, operands[0],
295 (enum memmodel) INTVAL (operands[3]));
299 (define_expand "atomic_nand_fetch<mode>"
300 [(set (match_operand:IMODE 0 "gr_register_operand" "")
302 (and:IMODE (match_operand:IMODE 1 "memory_operand" "")
303 (match_operand:IMODE 2 "nonmemory_operand" ""))))
304 (use (match_operand:SI 3 "const_int_operand" ""))]
307 ia64_expand_atomic_op (NOT, operands[1], operands[2], NULL, operands[0],
308 (enum memmodel) INTVAL (operands[3]));
312 (define_insn "fetchadd_acq_<mode>"
313 [(set (match_operand:I48MODE 0 "gr_register_operand" "=r")
314 (match_operand:I48MODE 1 "not_postinc_memory_operand" "+S"))
316 (unspec:I48MODE [(match_dup 1)
317 (match_operand:I48MODE 2 "fetchadd_operand" "n")]
318 UNSPEC_FETCHADD_ACQ))]
320 "fetchadd<modesuffix>.acq %0 = %1, %2"
321 [(set_attr "itanium_class" "sem")])
323 (define_insn "fetchadd_rel_<mode>"
324 [(set (match_operand:I48MODE 0 "gr_register_operand" "=r")
325 (match_operand:I48MODE 1 "not_postinc_memory_operand" "+S"))
327 (unspec:I48MODE [(match_dup 1)
328 (match_operand:I48MODE 2 "fetchadd_operand" "n")]
329 UNSPEC_FETCHADD_REL))]
331 "fetchadd<modesuffix>.rel %0 = %1, %2"
332 [(set_attr "itanium_class" "sem")])