[llvm] [ConstraintElim] Strengthen flags on mul and shl with constant operand. (PR #219293)

via llvm-commits llvm-commits at lists.llvm.org
Fri Aug 28 03:03:53 PDT 2026


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git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Scalar/ConstraintElimination.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Transforms/Scalar/ConstraintElimination.cpp b/llvm/lib/Transforms/Scalar/ConstraintElimination.cpp
index b2827ca84..65cfcd782 100644
--- a/llvm/lib/Transforms/Scalar/ConstraintElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/ConstraintElimination.cpp
@@ -1319,8 +1319,7 @@ static bool canStrengthenFlags(Instruction *I) {
 /// a signed range if \p Signed is set and as an unsigned range otherwise.
 static bool doesHoldInRange(const ConstraintInfo &Info, Value *Op,
                             const ConstantRange &R, bool Signed) {
-  if (R.isEmptySet() ||
-      (Signed ? R.isSignWrappedSet() : R.isWrappedSet()))
+  if (R.isEmptySet() || (Signed ? R.isSignWrappedSet() : R.isWrappedSet()))
     return false;
 
   if (R.isFullSet())

``````````

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https://github.com/llvm/llvm-project/pull/219293


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