[llvm] [InstCombine] Fold (sub nsw X, umin(X, C)) s< C2 to (X s< C + C2) (PR #170422)
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Tue Dec 2 21:46:45 PST 2025
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/InstCombine/InstCombineAddSub.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/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
index df096e7b8..6a0c75f76 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -2864,8 +2864,8 @@ Instruction *InstCombinerImpl::visitSub(BinaryOperator &I) {
// 2. C2 > 0: Range [C, C+C2) must imply extension.
// 3. No Signed Overflow: Merged upper bound (C + C2) must be safe.
const APInt *C;
- if (I.hasOneUse() && I.hasNoSignedWrap() &&
- match(X, m_APInt(C)) && C->isNonNegative()) {
+ if (I.hasOneUse() && I.hasNoSignedWrap() && match(X, m_APInt(C)) &&
+ C->isNonNegative()) {
const APInt *C2;
CmpPredicate Pred;
Instruction *MustICmp = cast<Instruction>(I.user_back());
``````````
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https://github.com/llvm/llvm-project/pull/170422
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