[llvm] LowerAtomic: Use explicit alignment in lowerAtomicCmpXchgInst (PR #103767)
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Wed Aug 14 03:51:02 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-transforms
Author: Matt Arsenault (arsenm)
<details>
<summary>Changes</summary>
---
Full diff: https://github.com/llvm/llvm-project/pull/103767.diff
1 Files Affected:
- (modified) llvm/lib/Transforms/Utils/LowerAtomic.cpp (+3-2)
``````````diff
diff --git a/llvm/lib/Transforms/Utils/LowerAtomic.cpp b/llvm/lib/Transforms/Utils/LowerAtomic.cpp
index b203970ef9c5a..f9bf419fb0225 100644
--- a/llvm/lib/Transforms/Utils/LowerAtomic.cpp
+++ b/llvm/lib/Transforms/Utils/LowerAtomic.cpp
@@ -25,10 +25,11 @@ bool llvm::lowerAtomicCmpXchgInst(AtomicCmpXchgInst *CXI) {
Value *Cmp = CXI->getCompareOperand();
Value *Val = CXI->getNewValOperand();
- LoadInst *Orig = Builder.CreateLoad(Val->getType(), Ptr);
+ LoadInst *Orig =
+ Builder.CreateAlignedLoad(Val->getType(), Ptr, CXI->getAlign());
Value *Equal = Builder.CreateICmpEQ(Orig, Cmp);
Value *Res = Builder.CreateSelect(Equal, Val, Orig);
- Builder.CreateStore(Res, Ptr);
+ Builder.CreateAlignedStore(Res, Ptr, CXI->getAlign());
Res = Builder.CreateInsertValue(PoisonValue::get(CXI->getType()), Orig, 0);
Res = Builder.CreateInsertValue(Res, Equal, 1);
``````````
</details>
https://github.com/llvm/llvm-project/pull/103767
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