[llvm] [LV] Use shl for (VFxUF * vscale) when creating minimum iter check. (PR #153495)
Florian Hahn via llvm-commits
llvm-commits at lists.llvm.org
Thu Aug 14 02:21:48 PDT 2025
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@@ -2298,7 +2304,10 @@ Value *InnerLoopVectorizer::createIterationCountCheck(ElementCount VF,
// Reuse existing vector loop preheader for TC checks.
// Note that new preheader block is generated for vector loop.
BasicBlock *const TCCheckBlock = LoopVectorPreHeader;
- IRBuilder<> Builder(TCCheckBlock->getTerminator());
+ IRBuilder<InstSimplifyFolder> Builder(
+ TCCheckBlock->getContext(),
+ InstSimplifyFolder(TCCheckBlock->getDataLayout()));
+ Builder.SetInsertPoint(TCCheckBlock->getTerminator());
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fhahn wrote:
note: this helps to remove some redundant `shl x, 0` instructions
https://github.com/llvm/llvm-project/pull/153495
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