1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
index 79a551f70c8..067a884bc9d 100644
--- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -342,6 +342,10 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
     }
   }
 
+  if (Value *Op0v = dyn_castNegVal(Op0))     // -X * -Y = X*Y
+    if (Value *Op1v = dyn_castNegVal(I.getOperand(1)))
+      return BinaryOperator::create(Instruction::Mul, Op0v, Op1v);
+
   return Changed ? &I : 0;
 }