llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-aarch64
Author: Fangrui Song (MaskRay)
<details>
<summary>Changes</summary>
GCC sets `#define HAVE_atomic_compare_and_swapti 1` and therefore
defines `__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16`.
Clang compiles the 16-byte legacy `__sync_bool_compare_and_swap` and new
`__atomic_compare_exchange` compile to LDXP/STXP or (with LSE)
CASP{,A,L,AL}.
Link: https://github.com/llvm/llvm-project/issues/71883
---
Full diff: https://github.com/llvm/llvm-project/pull/74954.diff
2 Files Affected:
- (modified) clang/lib/Basic/Targets/AArch64.cpp (+1)
- (modified) clang/test/Preprocessor/init-aarch64.c (+1)
``````````diff
diff --git a/clang/lib/Basic/Targets/AArch64.cpp
b/clang/lib/Basic/Targets/AArch64.cpp
index c31f2e0bee543..07f86b62d86e1 100644
--- a/clang/lib/Basic/Targets/AArch64.cpp
+++ b/clang/lib/Basic/Targets/AArch64.cpp
@@ -579,6 +579,7 @@ void AArch64TargetInfo::getTargetDefines(const LangOptions
&Opts,
Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2");
Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4");
Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8");
+ Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16");
// Allow detection of fast FMA support.
Builder.defineMacro("__FP_FAST_FMA", "1");
diff --git a/clang/test/Preprocessor/init-aarch64.c
b/clang/test/Preprocessor/init-aarch64.c
index b0333b3f02389..94c091a69e844 100644
--- a/clang/test/Preprocessor/init-aarch64.c
+++ b/clang/test/Preprocessor/init-aarch64.c
@@ -118,6 +118,7 @@
// AARCH64-NEXT: #define __FP_FAST_FMAF 1
// AARCH64-NEXT: #define __GCC_ASM_FLAG_OUTPUTS__ 1
// AARCH64-NEXT: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
+// AARCH64-NEXT: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 1
// AARCH64-NEXT: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
// AARCH64-NEXT: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
// AARCH64-NEXT: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
``````````
</details>
https://github.com/llvm/llvm-project/pull/74954
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
