[llvm] [InstCombine] Fold `ceil(X / (2 ^ C)) == 0` -> `X == 0` (PR #143683)
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Sun Jun 22 02:38:26 PDT 2025
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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->
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You can test this locally with the following command:
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git-clang-format --diff HEAD~1 HEAD --extensions h,cpp -- llvm/include/llvm/Analysis/ValueTracking.h llvm/lib/Analysis/ValueTracking.cpp llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
index 32c7ede47..0894ca920 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -1303,7 +1303,8 @@ Instruction *InstCombinerImpl::foldICmpWithZero(ICmpInst &Cmp) {
// where f(X) == 0 if and only if X == 0
if (ICmpInst::isEquality(Pred))
if (Value *Stripped = stripNullTest(Cmp.getOperand(0)))
- return new ICmpInst(Pred, Stripped, Constant::getNullValue(Stripped->getType()));
+ return new ICmpInst(Pred, Stripped,
+ Constant::getNullValue(Stripped->getType()));
return nullptr;
}
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https://github.com/llvm/llvm-project/pull/143683
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