https://github.com/AtariDreams created
https://github.com/llvm/llvm-project/pull/79191
The backend supports it now, so we can use it.
>From de9497dcfee7c3f49f7729f75bf2714b6059617d Mon Sep 17 00:00:00 2001
From: Rose <83477269+ataridre...@users.noreply.github.com>
Date: Tue, 23 Jan 2024 13:59:05 -0500
Subject: [PATCH] Use unaligned atomic load and stores on x86
The backend supports it now, so we can use it.
---
clang/lib/CodeGen/CGObjC.cpp | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/clang/lib/CodeGen/CGObjC.cpp b/clang/lib/CodeGen/CGObjC.cpp
index 03fc0ec7ff54e1..debfc84f49e484 100644
--- a/clang/lib/CodeGen/CGObjC.cpp
+++ b/clang/lib/CodeGen/CGObjC.cpp
@@ -846,8 +846,9 @@ static void emitStructGetterCall(CodeGenFunction &CGF,
ObjCIvarDecl *ivar,
/// accesses. They don't have to be fast, just faster than a function
/// call and a mutex.
static bool hasUnalignedAtomics(llvm::Triple::ArchType arch) {
- // FIXME: Allow unaligned atomic load/store on x86. (It is not
- // currently supported by the backend.)
+ // x86 is the only one so far that we know support this as of now
+ if (arch == llvm::Triple::x86 || arch == llvm::Triple::x86_64)
+ return true;
return false;
}
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