;; Machine Description for MIPS based processor synchronization ;; instructions. ;; Copyright (C) 2007-2021 Free Software Foundation, Inc.

;; This file is part of GCC.

;; GCC is free software; you can redistribute it and/or modify ;; it under the terms of the GNU General Public License as published by ;; the Free Software Foundation; either version 3, or (at your option) ;; any later version.

;; GCC is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License ;; along with GCC; see the file COPYING3. If not see ;; http://www.gnu.org/licenses/.

(define_c_enum “unspec” [ UNSPEC_COMPARE_AND_SWAP UNSPEC_COMPARE_AND_SWAP_12 UNSPEC_SYNC_OLD_OP UNSPEC_SYNC_NEW_OP UNSPEC_SYNC_NEW_OP_12 UNSPEC_SYNC_OLD_OP_12 UNSPEC_SYNC_EXCHANGE UNSPEC_SYNC_EXCHANGE_12 UNSPEC_MEMORY_BARRIER UNSPEC_ATOMIC_COMPARE_AND_SWAP UNSPEC_ATOMIC_EXCHANGE UNSPEC_ATOMIC_FETCH_OP ])

;; Atomic fetch bitwise operations. (define_code_iterator fetchop_bit [ior xor and])

;; Atomic HI and QI operations (define_code_iterator atomic_hiqi_op [plus minus ior xor and])

;; Atomic memory operations.

(define_expand “memory_barrier” [(set (match_dup 0) (unspec:BLK [(match_dup 0)] UNSPEC_MEMORY_BARRIER))] “GENERATE_SYNC” { operands[0] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); MEM_VOLATILE_P (operands[0]) = 1; })

(define_insn “*memory_barrier” [(set (match_operand:BLK 0 "" "") (unspec:BLK [(match_dup 0)] UNSPEC_MEMORY_BARRIER))] “GENERATE_SYNC” { return mips_output_sync (); })

;; Can be removed in favor of atomic_compare_and_swap below. (define_insn “sync_compare_and_swap” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) (match_operand:GPR 1 “memory_operand” “+ZC,ZC”)) (set (match_dup 1) (unspec_volatile:GPR [(match_operand:GPR 2 “reg_or_0_operand” “dJ,dJ”) (match_operand:GPR 3 “arith_operand” “I,d”)] UNSPEC_COMPARE_AND_SWAP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “li,move”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_required_oldval” “2”) (set_attr “sync_insn1_op2” “3”)])

(define_expand “sync_compare_and_swap” [(match_operand:SHORT 0 “register_operand”) (match_operand:SHORT 1 “memory_operand”) (match_operand:SHORT 2 “general_operand”) (match_operand:SHORT 3 “general_operand”)] “GENERATE_LL_SC” { union mips_gen_fn_ptrs generator; generator.fn_6 = gen_compare_and_swap_12; mips_expand_atomic_qihi (generator, operands[0], operands[1], operands[2], operands[3]); DONE; })

;; Helper insn for mips_expand_atomic_qihi. (define_insn “compare_and_swap_12” [(set (match_operand:SI 0 “register_operand” “=&d,&d”) (match_operand:SI 1 “memory_operand” “+ZC,ZC”)) (set (match_dup 1) (unspec_volatile:SI [(match_operand:SI 2 “register_operand” “d,d”) (match_operand:SI 3 “register_operand” “d,d”) (match_operand:SI 4 “reg_or_0_operand” “dJ,dJ”) (match_operand:SI 5 “reg_or_0_operand” “d,J”)] UNSPEC_COMPARE_AND_SWAP_12))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_inclusive_mask” “2”) (set_attr “sync_exclusive_mask” “3”) (set_attr “sync_required_oldval” “4”) (set_attr “sync_insn1_op2” “5”)])

(define_insn “sync_add” [(set (match_operand:GPR 0 “memory_operand” “+ZC,ZC”) (unspec_volatile:GPR [(plus:GPR (match_dup 0) (match_operand:GPR 1 “arith_operand” “I,d”))] UNSPEC_SYNC_OLD_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “addiu,addu”) (set_attr “sync_mem” “0”) (set_attr “sync_insn1_op2” “1”)])

(define_expand “sync_” [(set (match_operand:SHORT 0 “memory_operand”) (unspec_volatile:SHORT [(atomic_hiqi_op:SHORT (match_dup 0) (match_operand:SHORT 1 “general_operand”))] UNSPEC_SYNC_OLD_OP))] “GENERATE_LL_SC” { union mips_gen_fn_ptrs generator; generator.fn_4 = gen_sync__12; mips_expand_atomic_qihi (generator, NULL, operands[0], operands[1], NULL); DONE; })

;; Helper insn for sync_ (define_insn “sync__12” [(set (match_operand:SI 0 “memory_operand” “+ZC”) (unspec_volatile:SI [(match_operand:SI 1 “register_operand” “d”) (match_operand:SI 2 “register_operand” “d”) (atomic_hiqi_op:SI (match_dup 0) (match_operand:SI 3 “reg_or_0_operand” “dJ”))] UNSPEC_SYNC_OLD_OP_12)) (clobber (match_scratch:SI 4 “=&d”))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “”) (set_attr “sync_insn2” “and”) (set_attr “sync_mem” “0”) (set_attr “sync_inclusive_mask” “1”) (set_attr “sync_exclusive_mask” “2”) (set_attr “sync_insn1_op2” “3”) (set_attr “sync_oldval” “4”) (set_attr “sync_newval” “4”)])

(define_expand “sync_old_” [(parallel [ (set (match_operand:SHORT 0 “register_operand”) (match_operand:SHORT 1 “memory_operand”)) (set (match_dup 1) (unspec_volatile:SHORT [(atomic_hiqi_op:SHORT (match_dup 1) (match_operand:SHORT 2 “general_operand”))] UNSPEC_SYNC_OLD_OP))])] “GENERATE_LL_SC” { union mips_gen_fn_ptrs generator; generator.fn_5 = gen_sync_old__12; mips_expand_atomic_qihi (generator, operands[0], operands[1], operands[2], NULL); DONE; })

;; Helper insn for sync_old_ (define_insn “sync_old__12” [(set (match_operand:SI 0 “register_operand” “=&d”) (match_operand:SI 1 “memory_operand” “+ZC”)) (set (match_dup 1) (unspec_volatile:SI [(match_operand:SI 2 “register_operand” “d”) (match_operand:SI 3 “register_operand” “d”) (atomic_hiqi_op:SI (match_dup 0) (match_operand:SI 4 “reg_or_0_operand” “dJ”))] UNSPEC_SYNC_OLD_OP_12)) (clobber (match_scratch:SI 5 “=&d”))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “”) (set_attr “sync_insn2” “and”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_inclusive_mask” “2”) (set_attr “sync_exclusive_mask” “3”) (set_attr “sync_insn1_op2” “4”) (set_attr “sync_newval” “5”)])

(define_expand “sync_new_” [(parallel [ (set (match_operand:SHORT 0 “register_operand”) (unspec_volatile:SHORT [(atomic_hiqi_op:SHORT (match_operand:SHORT 1 “memory_operand”) (match_operand:SHORT 2 “general_operand”))] UNSPEC_SYNC_NEW_OP)) (set (match_dup 1) (unspec_volatile:SHORT [(match_dup 1) (match_dup 2)] UNSPEC_SYNC_NEW_OP))])] “GENERATE_LL_SC” { union mips_gen_fn_ptrs generator; generator.fn_5 = gen_sync_new__12; mips_expand_atomic_qihi (generator, operands[0], operands[1], operands[2], NULL); DONE; })

;; Helper insn for sync_new_ (define_insn “sync_new__12” [(set (match_operand:SI 0 “register_operand” “=&d”) (unspec_volatile:SI [(match_operand:SI 1 “memory_operand” “+ZC”) (match_operand:SI 2 “register_operand” “d”) (match_operand:SI 3 “register_operand” “d”) (atomic_hiqi_op:SI (match_dup 0) (match_operand:SI 4 “reg_or_0_operand” “dJ”))] UNSPEC_SYNC_NEW_OP_12)) (set (match_dup 1) (unspec_volatile:SI [(match_dup 1) (match_dup 2) (match_dup 3) (match_dup 4)] UNSPEC_SYNC_NEW_OP_12))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “”) (set_attr “sync_insn2” “and”) (set_attr “sync_oldval” “0”) (set_attr “sync_newval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_inclusive_mask” “2”) (set_attr “sync_exclusive_mask” “3”) (set_attr “sync_insn1_op2” “4”)])

(define_expand “sync_nand” [(set (match_operand:SHORT 0 “memory_operand”) (unspec_volatile:SHORT [(match_dup 0) (match_operand:SHORT 1 “general_operand”)] UNSPEC_SYNC_OLD_OP))] “GENERATE_LL_SC” { union mips_gen_fn_ptrs generator; generator.fn_4 = gen_sync_nand_12; mips_expand_atomic_qihi (generator, NULL, operands[0], operands[1], NULL); DONE; })

;; Helper insn for sync_nand (define_insn “sync_nand_12” [(set (match_operand:SI 0 “memory_operand” “+ZC”) (unspec_volatile:SI [(match_operand:SI 1 “register_operand” “d”) (match_operand:SI 2 “register_operand” “d”) (match_dup 0) (match_operand:SI 3 “reg_or_0_operand” “dJ”)] UNSPEC_SYNC_OLD_OP_12)) (clobber (match_scratch:SI 4 “=&d”))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “and”) (set_attr “sync_insn2” “xor”) (set_attr “sync_mem” “0”) (set_attr “sync_inclusive_mask” “1”) (set_attr “sync_exclusive_mask” “2”) (set_attr “sync_insn1_op2” “3”) (set_attr “sync_oldval” “4”) (set_attr “sync_newval” “4”)])

(define_expand “sync_old_nand” [(parallel [ (set (match_operand:SHORT 0 “register_operand”) (match_operand:SHORT 1 “memory_operand”)) (set (match_dup 1) (unspec_volatile:SHORT [(match_dup 1) (match_operand:SHORT 2 “general_operand”)] UNSPEC_SYNC_OLD_OP))])] “GENERATE_LL_SC” { union mips_gen_fn_ptrs generator; generator.fn_5 = gen_sync_old_nand_12; mips_expand_atomic_qihi (generator, operands[0], operands[1], operands[2], NULL); DONE; })

;; Helper insn for sync_old_nand (define_insn “sync_old_nand_12” [(set (match_operand:SI 0 “register_operand” “=&d”) (match_operand:SI 1 “memory_operand” “+ZC”)) (set (match_dup 1) (unspec_volatile:SI [(match_operand:SI 2 “register_operand” “d”) (match_operand:SI 3 “register_operand” “d”) (match_operand:SI 4 “reg_or_0_operand” “dJ”)] UNSPEC_SYNC_OLD_OP_12)) (clobber (match_scratch:SI 5 “=&d”))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “and”) (set_attr “sync_insn2” “xor”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_inclusive_mask” “2”) (set_attr “sync_exclusive_mask” “3”) (set_attr “sync_insn1_op2” “4”) (set_attr “sync_newval” “5”)])

(define_expand “sync_new_nand” [(parallel [ (set (match_operand:SHORT 0 “register_operand”) (unspec_volatile:SHORT [(match_operand:SHORT 1 “memory_operand”) (match_operand:SHORT 2 “general_operand”)] UNSPEC_SYNC_NEW_OP)) (set (match_dup 1) (unspec_volatile:SHORT [(match_dup 1) (match_dup 2)] UNSPEC_SYNC_NEW_OP))])] “GENERATE_LL_SC” { union mips_gen_fn_ptrs generator; generator.fn_5 = gen_sync_new_nand_12; mips_expand_atomic_qihi (generator, operands[0], operands[1], operands[2], NULL); DONE; })

;; Helper insn for sync_new_nand (define_insn “sync_new_nand_12” [(set (match_operand:SI 0 “register_operand” “=&d”) (unspec_volatile:SI [(match_operand:SI 1 “memory_operand” “+ZC”) (match_operand:SI 2 “register_operand” “d”) (match_operand:SI 3 “register_operand” “d”) (match_operand:SI 4 “reg_or_0_operand” “dJ”)] UNSPEC_SYNC_NEW_OP_12)) (set (match_dup 1) (unspec_volatile:SI [(match_dup 1) (match_dup 2) (match_dup 3) (match_dup 4)] UNSPEC_SYNC_NEW_OP_12))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “and”) (set_attr “sync_insn2” “xor”) (set_attr “sync_oldval” “0”) (set_attr “sync_newval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_inclusive_mask” “2”) (set_attr “sync_exclusive_mask” “3”) (set_attr “sync_insn1_op2” “4”)])

(define_insn “sync_sub” [(set (match_operand:GPR 0 “memory_operand” “+ZC”) (unspec_volatile:GPR [(minus:GPR (match_dup 0) (match_operand:GPR 1 “register_operand” “d”))] UNSPEC_SYNC_OLD_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “subu”) (set_attr “sync_mem” “0”) (set_attr “sync_insn1_op2” “1”)])

;; Can be removed in favor of atomic_fetch_add below. (define_insn “sync_old_add” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) (match_operand:GPR 1 “memory_operand” “+ZC,ZC”)) (set (match_dup 1) (unspec_volatile:GPR [(plus:GPR (match_dup 1) (match_operand:GPR 2 “arith_operand” “I,d”))] UNSPEC_SYNC_OLD_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “addiu,addu”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”)])

(define_insn “sync_old_sub” [(set (match_operand:GPR 0 “register_operand” “=&d”) (match_operand:GPR 1 “memory_operand” “+ZC”)) (set (match_dup 1) (unspec_volatile:GPR [(minus:GPR (match_dup 1) (match_operand:GPR 2 “register_operand” “d”))] UNSPEC_SYNC_OLD_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “subu”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”)])

(define_insn “sync_new_add” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) (plus:GPR (match_operand:GPR 1 “memory_operand” “+ZC,ZC”) (match_operand:GPR 2 “arith_operand” “I,d”))) (set (match_dup 1) (unspec_volatile:GPR [(plus:GPR (match_dup 1) (match_dup 2))] UNSPEC_SYNC_NEW_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “addiu,addu”) (set_attr “sync_oldval” “0”) (set_attr “sync_newval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”)])

(define_insn “sync_new_sub” [(set (match_operand:GPR 0 “register_operand” “=&d”) (minus:GPR (match_operand:GPR 1 “memory_operand” “+ZC”) (match_operand:GPR 2 “register_operand” “d”))) (set (match_dup 1) (unspec_volatile:GPR [(minus:GPR (match_dup 1) (match_dup 2))] UNSPEC_SYNC_NEW_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “subu”) (set_attr “sync_oldval” “0”) (set_attr “sync_newval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”)])

(define_insn “sync_” [(set (match_operand:GPR 0 “memory_operand” “+ZC,ZC”) (unspec_volatile:GPR [(fetchop_bit:GPR (match_operand:GPR 1 “uns_arith_operand” “K,d”) (match_dup 0))] UNSPEC_SYNC_OLD_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “<immediate_insn>,”) (set_attr “sync_mem” “0”) (set_attr “sync_insn1_op2” “1”)])

(define_insn “sync_old_” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) (match_operand:GPR 1 “memory_operand” “+ZC,ZC”)) (set (match_dup 1) (unspec_volatile:GPR [(fetchop_bit:GPR (match_operand:GPR 2 “uns_arith_operand” “K,d”) (match_dup 1))] UNSPEC_SYNC_OLD_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “<immediate_insn>,”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”)])

(define_insn “sync_new_” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) (match_operand:GPR 1 “memory_operand” “+ZC,ZC”)) (set (match_dup 1) (unspec_volatile:GPR [(fetchop_bit:GPR (match_operand:GPR 2 “uns_arith_operand” “K,d”) (match_dup 1))] UNSPEC_SYNC_NEW_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “<immediate_insn>,”) (set_attr “sync_oldval” “0”) (set_attr “sync_newval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”)])

(define_insn “sync_nand” [(set (match_operand:GPR 0 “memory_operand” “+ZC,ZC”) (unspec_volatile:GPR [(match_operand:GPR 1 “uns_arith_operand” “K,d”)] UNSPEC_SYNC_OLD_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “andi,and”) (set_attr “sync_insn2” “not”) (set_attr “sync_mem” “0”) (set_attr “sync_insn1_op2” “1”)])

(define_insn “sync_old_nand” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) (match_operand:GPR 1 “memory_operand” “+ZC,ZC”)) (set (match_dup 1) (unspec_volatile:GPR [(match_operand:GPR 2 “uns_arith_operand” “K,d”)] UNSPEC_SYNC_OLD_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “andi,and”) (set_attr “sync_insn2” “not”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”)])

(define_insn “sync_new_nand” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) (match_operand:GPR 1 “memory_operand” “+ZC,ZC”)) (set (match_dup 1) (unspec_volatile:GPR [(match_operand:GPR 2 “uns_arith_operand” “K,d”)] UNSPEC_SYNC_NEW_OP))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “andi,and”) (set_attr “sync_insn2” “not”) (set_attr “sync_oldval” “0”) (set_attr “sync_newval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”)])

(define_insn “sync_lock_test_and_set” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) (match_operand:GPR 1 “memory_operand” “+ZC,ZC”)) (set (match_dup 1) (unspec_volatile:GPR [(match_operand:GPR 2 “arith_operand” “I,d”)] UNSPEC_SYNC_EXCHANGE))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_memmodel” “11”) (set_attr “sync_insn1” “li,move”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”)])

(define_expand “sync_lock_test_and_set” [(match_operand:SHORT 0 “register_operand”) (match_operand:SHORT 1 “memory_operand”) (match_operand:SHORT 2 “general_operand”)] “GENERATE_LL_SC” { union mips_gen_fn_ptrs generator; generator.fn_5 = gen_test_and_set_12; mips_expand_atomic_qihi (generator, operands[0], operands[1], operands[2], NULL); DONE; })

(define_insn “test_and_set_12” [(set (match_operand:SI 0 “register_operand” “=&d”) (match_operand:SI 1 “memory_operand” “+ZC”)) (set (match_dup 1) (unspec_volatile:SI [(match_operand:SI 2 “register_operand” “d”) (match_operand:SI 3 “register_operand” “d”) (match_operand:SI 4 “reg_or_0_operand” “dJ”)] UNSPEC_SYNC_EXCHANGE_12))] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_memmodel” “11”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) ;; Unused, but needed to give the number of operands expected by ;; the expander. (set_attr “sync_inclusive_mask” “2”) (set_attr “sync_exclusive_mask” “3”) (set_attr “sync_insn1_op2” “4”)])

(define_insn “atomic_compare_and_swap” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) ;; Logically this unspec is an “eq” operator, but we need to obscure ;; reads and writes from/to memory with an unspec to prevent ;; optimizations on shared memory locations. Otherwise, comparison in ;; { mem = 2; if (atomic_cmp_swap(mem,...) == 2) ...; } ;; would be optimized away. In addition to that we need to use ;; unspec_volatile, not just plain unspec -- for the sake of other ;; threads -- to make sure we don‘t remove the entirety of the pattern ;; just because current thread doesn’t observe any effect from it. ;; TODO: the obscuring unspec can be relaxed for permissive memory ;; models. ;; Same applies to other atomic_* patterns. (unspec_volatile:GPR [(match_operand:GPR 2 “memory_operand” “+ZC,ZC”) (match_operand:GPR 3 “reg_or_0_operand” “dJ,dJ”)] UNSPEC_ATOMIC_COMPARE_AND_SWAP)) (set (match_operand:GPR 1 “register_operand” “=&d,&d”) (unspec_volatile:GPR [(match_dup 2)] UNSPEC_ATOMIC_COMPARE_AND_SWAP)) (set (match_dup 2) (unspec_volatile:GPR [(match_dup 2) (match_dup 3) (match_operand:GPR 4 “arith_operand” “I,d”)] UNSPEC_ATOMIC_COMPARE_AND_SWAP)) (unspec_volatile:GPR [(match_operand:SI 5 “const_int_operand”) (match_operand:SI 6 “const_int_operand”) (match_operand:SI 7 “const_int_operand”)] UNSPEC_ATOMIC_COMPARE_AND_SWAP)] “GENERATE_LL_SC” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “li,move”) (set_attr “sync_oldval” “1”) (set_attr “sync_cmp” “0”) (set_attr “sync_mem” “2”) (set_attr “sync_required_oldval” “3”) (set_attr “sync_insn1_op2” “4”) (set_attr “sync_memmodel” “6”)])

(define_expand “atomic_exchange” [(match_operand:GPR 0 “register_operand”) (match_operand:GPR 1 “memory_operand”) (match_operand:GPR 2 “arith_operand”) (match_operand:SI 3 “const_int_operand”)] “GENERATE_LL_SC || ISA_HAS_SWAP” { if (ISA_HAS_SWAP) { if (!mem_noofs_operand (operands[1], mode)) { rtx addr;

  addr = force_reg (Pmode, XEXP (operands[1], 0));
  operands[1] = replace_equiv_address (operands[1], addr);
}
  operands[2] = force_reg (<MODE>mode, operands[2]);
  emit_insn (gen_atomic_exchange<mode>_swap (operands[0], operands[1],
					 operands[2]));
}

else emit_insn (gen_atomic_exchange_llsc (operands[0], operands[1], operands[2], operands[3])); DONE; })

(define_insn “atomic_exchange_llsc” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) (unspec_volatile:GPR [(match_operand:GPR 1 “memory_operand” “+ZC,ZC”)] UNSPEC_ATOMIC_EXCHANGE)) (set (match_dup 1) (unspec_volatile:GPR [(match_operand:GPR 2 “arith_operand” “I,d”)] UNSPEC_ATOMIC_EXCHANGE)) (unspec_volatile:GPR [(match_operand:SI 3 “const_int_operand”)] UNSPEC_ATOMIC_EXCHANGE)] “GENERATE_LL_SC && !ISA_HAS_SWAP” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “li,move”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”) (set_attr “sync_memmodel” “3”)])

;; XLP issues implicit sync for SWAP/LDADD, so no need for an explicit one. (define_insn “atomic_exchange_swap” [(set (match_operand:GPR 0 “register_operand” “=d”) (unspec_volatile:GPR [(match_operand:GPR 1 “mem_noofs_operand” “+ZR”)] UNSPEC_ATOMIC_EXCHANGE)) (set (match_dup 1) (unspec_volatile:GPR [(match_operand:GPR 2 “register_operand” “0”)] UNSPEC_ATOMIC_EXCHANGE))] “ISA_HAS_SWAP” “swap\t%0,%b1” [(set_attr “type” “atomic”)])

(define_expand “atomic_fetch_add” [(match_operand:GPR 0 “register_operand”) (match_operand:GPR 1 “memory_operand”) (match_operand:GPR 2 “arith_operand”) (match_operand:SI 3 “const_int_operand”)] “GENERATE_LL_SC || ISA_HAS_LDADD” { if (ISA_HAS_LDADD) { if (!mem_noofs_operand (operands[1], mode)) { rtx addr;

  addr = force_reg (Pmode, XEXP (operands[1], 0));
  operands[1] = replace_equiv_address (operands[1], addr);
}
  operands[2] = force_reg (<MODE>mode, operands[2]);
  emit_insn (gen_atomic_fetch_add<mode>_ldadd (operands[0], operands[1],
					   operands[2]));
}

else emit_insn (gen_atomic_fetch_add_llsc (operands[0], operands[1], operands[2], operands[3])); DONE; })

(define_insn “atomic_fetch_add_llsc” [(set (match_operand:GPR 0 “register_operand” “=&d,&d”) (unspec_volatile:GPR [(match_operand:GPR 1 “memory_operand” “+ZC,ZC”)] UNSPEC_ATOMIC_FETCH_OP)) (set (match_dup 1) (unspec_volatile:GPR [(plus:GPR (match_dup 1) (match_operand:GPR 2 “arith_operand” “I,d”))] UNSPEC_ATOMIC_FETCH_OP)) (unspec_volatile:GPR [(match_operand:SI 3 “const_int_operand”)] UNSPEC_ATOMIC_FETCH_OP)] “GENERATE_LL_SC && !ISA_HAS_LDADD” { return mips_output_sync_loop (insn, operands); } [(set_attr “sync_insn1” “addiu,addu”) (set_attr “sync_oldval” “0”) (set_attr “sync_mem” “1”) (set_attr “sync_insn1_op2” “2”) (set_attr “sync_memmodel” “3”)])

;; XLP issues implicit sync for SWAP/LDADD, so no need for an explicit one. (define_insn “atomic_fetch_add_ldadd” [(set (match_operand:GPR 0 “register_operand” “=d”) (unspec_volatile:GPR [(match_operand:GPR 1 “mem_noofs_operand” “+ZR”)] UNSPEC_ATOMIC_FETCH_OP)) (set (match_dup 1) (unspec_volatile:GPR [(plus:GPR (match_dup 1) (match_operand:GPR 2 “register_operand” “0”))] UNSPEC_ATOMIC_FETCH_OP))] “ISA_HAS_LDADD” “ldadd\t%0,%b1” [(set_attr “type” “atomic”)])