[llvm] [InstCombine] Fold `fcmp (fmul X, C1), C2` to `fcmp X, C2/C1` (PR #205003)
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Sat Jul 11 11:25:11 PDT 2026
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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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``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
index f8fd1fff5..be1328df8 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -8889,18 +8889,17 @@ static Instruction *foldFCmpFmulIntoFCmp(FCmpInst &I, Instruction *LHSI,
return nullptr;
const APFloat *C1, *C2;
- if (!match(LHSI->getOperand(1), m_APFloat(C1)) ||
- !match(RHSC, m_APFloat(C2)))
+ if (!match(LHSI->getOperand(1), m_APFloat(C1)) || !match(RHSC, m_APFloat(C2)))
return nullptr;
Type *FPTy = LHSI->getType()->getScalarType();
if (I.getFunction()->getDenormalMode(FPTy->getFltSemantics()) !=
- DenormalMode::getIEEE())
+ DenormalMode::getIEEE())
return nullptr;
if (C1->isNegative())
Pred = I.getSwappedPredicate();
-
+
APFloat C = *C2;
if (C.divide(*C1, RoundingMode::NearestTiesToEven) != APFloat::opOK)
return nullptr;
``````````
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https://github.com/llvm/llvm-project/pull/205003
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