1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 1a4820e..c63618d 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -1954,6 +1954,9 @@ static bool isLifeTimeMarker(const Instruction *I) {
 // into variables.
 static bool replacingOperandWithVariableIsCheap(const Instruction *I,
                                                 int OpIdx) {
+  // Divide/Remainder by constant is typically much cheaper than by variable.
+  if (I->isIntDivRem())
+    return OpIdx != 1;
   return !isa<IntrinsicInst>(I);
 }