1 files changed, 6 insertions, 7 deletions

diff --git a/contrib/llvm-project/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/contrib/llvm-project/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 61d891d65346..7515e539e7fb 100644
--- a/contrib/llvm-project/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/contrib/llvm-project/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -6919,18 +6919,17 @@ static bool ReduceSwitchRange(SwitchInst *SI, IRBuilder<> &Builder,
 
   auto *Ty = cast<IntegerType>(SI->getCondition()->getType());
   Builder.SetInsertPoint(SI);
-  auto *ShiftC = ConstantInt::get(Ty, Shift);
-  auto *Sub = Builder.CreateSub(SI->getCondition(), ConstantInt::get(Ty, Base));
-  auto *LShr = Builder.CreateLShr(Sub, ShiftC);
-  auto *Shl = Builder.CreateShl(Sub, Ty->getBitWidth() - Shift);
-  auto *Rot = Builder.CreateOr(LShr, Shl);
+  Value *Sub =
+      Builder.CreateSub(SI->getCondition(), ConstantInt::get(Ty, Base));
+  Value *Rot = Builder.CreateIntrinsic(
+      Ty, Intrinsic::fshl,
+      {Sub, Sub, ConstantInt::get(Ty, Ty->getBitWidth() - Shift)});
   SI->replaceUsesOfWith(SI->getCondition(), Rot);
 
   for (auto Case : SI->cases()) {
     auto *Orig = Case.getCaseValue();
     auto Sub = Orig->getValue() - APInt(Ty->getBitWidth(), Base);
-    Case.setValue(
-        cast<ConstantInt>(ConstantInt::get(Ty, Sub.lshr(ShiftC->getValue()))));
+    Case.setValue(cast<ConstantInt>(ConstantInt::get(Ty, Sub.lshr(Shift))));
   }
   return true;
 }