https://github.com/MaskRay updated
https://github.com/llvm/llvm-project/pull/74954
>From 33f2816d7965ab6de2e401282922d9ddfe2e3222 Mon Sep 17 00:00:00 2001
From: Fangrui Song <i...@maskray.me>
Date: Sat, 9 Dec 2023 15:15:17 -0800
Subject: [PATCH] [Preprocessor] Define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 for
AArch64
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
---
clang/lib/Basic/Targets/AArch64.cpp | 3 ++-
clang/test/Preprocessor/init-aarch64.c | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/clang/lib/Basic/Targets/AArch64.cpp
b/clang/lib/Basic/Targets/AArch64.cpp
index c31f2e0bee5439..e3e08b571667cc 100644
--- a/clang/lib/Basic/Targets/AArch64.cpp
+++ b/clang/lib/Basic/Targets/AArch64.cpp
@@ -574,11 +574,12 @@ void AArch64TargetInfo::getTargetDefines(const
LangOptions &Opts,
else if (*ArchInfo == llvm::AArch64::ARMV9_5A)
getTargetDefinesARMV95A(Opts, Builder);
- // All of the __sync_(bool|val)_compare_and_swap_(1|2|4|8) builtins work.
+ // All of the __sync_(bool|val)_compare_and_swap_(1|2|4|8|16) builtins work.
Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1");
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 b0333b3f023890..94c091a69e8444 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
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