[llvm] [InstCombine]: Canonicalize to a mask when trunc nuw (PR #163628)

via llvm-commits llvm-commits at lists.llvm.org
Thu Oct 16 13:47:43 PDT 2025


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
index 0bf43e5c3..fba1ccf2c 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -1487,7 +1487,7 @@ Instruction *InstCombinerImpl::foldICmpTruncConstant(ICmpInst &Cmp,
     if (!SrcTy->isVectorTy() && shouldChangeType(DstBits, SrcBits)) {
       Constant *Mask =
           ConstantInt::get(SrcTy, APInt::getLowBitsSet(SrcBits, DstBits));
-      Value *And =  Trunc->hasNoUnsignedWrap() ? X : Builder.CreateAnd(X, Mask);
+      Value *And = Trunc->hasNoUnsignedWrap() ? X : Builder.CreateAnd(X, Mask);
       Constant *WideC = ConstantInt::get(SrcTy, C.zext(SrcBits));
       return new ICmpInst(Pred, And, WideC);
     }

``````````

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https://github.com/llvm/llvm-project/pull/163628


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