[llvm] 5ececb4 - LowerAtomic: Use explicit alignment in lowerAtomicCmpXchgInst (#103767)

[via llvm-commits]

Author: Matt Arsenault
Date: 2024-08-14T17:04:13+04:00
New Revision: 5ececb4745a37f7b3dfade12e44e95c6b5e3c5bf

URL: https://github.com/llvm/llvm-project/commit/5ececb4745a37f7b3dfade12e44e95c6b5e3c5bf
DIFF: https://github.com/llvm/llvm-project/commit/5ececb4745a37f7b3dfade12e44e95c6b5e3c5bf.diff

LOG: LowerAtomic: Use explicit alignment in lowerAtomicCmpXchgInst (#103767)

Added: 
    

Modified: 
    llvm/lib/Transforms/Utils/LowerAtomic.cpp

Removed: 
    


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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);