[llvm] [VectorCombine] Fix scalarizeExtExtract for big-endian (PR #157962)
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Thu Sep 11 05:57:08 PDT 2025
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git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Vectorize/VectorCombine.cpp
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
index ce785278b..77d4227ad 100644
--- a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
+++ b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
@@ -2018,9 +2018,10 @@ bool VectorCombine::scalarizeExtExtract(Instruction &I) {
auto *Extract = cast<ExtractElementInst>(U);
uint64_t Idx =
cast<ConstantInt>(Extract->getIndexOperand())->getZExtValue();
- uint64_t ShiftAmt = DL->isBigEndian()
- ? (TotalBits - SrcEltSizeInBits - Idx * SrcEltSizeInBits)
- : (Idx * SrcEltSizeInBits);
+ uint64_t ShiftAmt =
+ DL->isBigEndian()
+ ? (TotalBits - SrcEltSizeInBits - Idx * SrcEltSizeInBits)
+ : (Idx * SrcEltSizeInBits);
Value *ShAmtVal = ConstantInt::get(PackedTy, ShiftAmt);
Value *LShr = Builder.CreateLShr(ScalarV, ShAmtVal);
Value *And = Builder.CreateAnd(LShr, Mask);
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https://github.com/llvm/llvm-project/pull/157962
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