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| author | Xi Ruoyao <xry111@xry111.site> | 2025-03-01 11:46:43 +0800 |
|---|---|---|
| committer | Lulu Cheng <chenglulu@loongson.cn> | 2025-08-18 09:09:34 +0800 |
| commit | d1d7ecfbc6d86f660ec79ca272b20aea9d6c3ca7 (patch) | |
| tree | 591e26d14eccb7c1c6b84d9a1299976fb76b4603 | |
| parent | b8e147d46ea5e78be0a390e645600afc4cbae645 (diff) | |
| download | gcc-d1d7ecfbc6d86f660ec79ca272b20aea9d6c3ca7.zip gcc-d1d7ecfbc6d86f660ec79ca272b20aea9d6c3ca7.tar.gz gcc-d1d7ecfbc6d86f660ec79ca272b20aea9d6c3ca7.tar.bz2 | |
LoongArch: Don't use "+" for atomic_{load, store} "m" constraint
Atomic load does not modify the memory. Atomic store does not read the
memory, thus we can use "=" instead.
gcc/ChangeLog:
* config/loongarch/sync.md (atomic_load<mode>): Remove "+" for
the memory operand.
(atomic_store<mode>): Use "=" instead of "+" for the memory
operand.
| -rw-r--r-- | gcc/config/loongarch/sync.md | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/gcc/config/loongarch/sync.md b/gcc/config/loongarch/sync.md index f712c2f..63929ab 100644 --- a/gcc/config/loongarch/sync.md +++ b/gcc/config/loongarch/sync.md @@ -102,7 +102,7 @@ (define_insn "atomic_load<mode>" [(set (match_operand:QHWD 0 "register_operand" "=r") (unspec_volatile:QHWD - [(match_operand:QHWD 1 "memory_operand" "+m") + [(match_operand:QHWD 1 "memory_operand" "m") (match_operand:SI 2 "const_int_operand")] ;; model UNSPEC_ATOMIC_LOAD))] "" @@ -139,7 +139,7 @@ ;; Implement atomic stores with amoswap. Fall back to fences for atomic loads. (define_insn "atomic_store<mode>" - [(set (match_operand:QHWD 0 "memory_operand" "+m") + [(set (match_operand:QHWD 0 "memory_operand" "=m") (unspec_volatile:QHWD [(match_operand:QHWD 1 "reg_or_0_operand" "rJ") (match_operand:SI 2 "const_int_operand")] ;; model |