1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 9f33d2f..c457931 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -3343,6 +3343,14 @@ Value *llvm::invertCondition(Value *Condition) {
       if (I->getParent() == Parent && match(I, m_Not(m_Specific(Condition))))
         return I;
 
+  // Fourth: Modify an existing instruction
+  if (Condition->hasOneUse()) {
+    if (auto *CI = dyn_cast<CmpInst>(Condition)) {
+      CI->setPredicate(CI->getInversePredicate());
+      return Condition;
+    }
+  }
+
   // Last option: Create a new instruction
   auto *Inverted =
       BinaryOperator::CreateNot(Condition, Condition->getName() + ".inv");