vendor/llvm/llvm-r130700

1 files changed, 8 insertions, 1 deletions

diff --git a/lib/Transforms/InstCombine/InstCombineShifts.cpp b/lib/Transforms/InstCombine/InstCombineShifts.cpp
index a7f800587bb6..811f94976f68 100644
--- a/lib/Transforms/InstCombine/InstCombineShifts.cpp
+++ b/lib/Transforms/InstCombine/InstCombineShifts.cpp
@@ -644,7 +644,14 @@ Instruction *InstCombiner::visitShl(BinaryOperator &I) {
       return &I;
     }
   }
-  
+
+  // (C1 << A) << C2 -> (C1 << C2) << A
+  Constant *C1, *C2;
+  Value *A;
+  if (match(I.getOperand(0), m_OneUse(m_Shl(m_Constant(C1), m_Value(A)))) &&
+      match(I.getOperand(1), m_Constant(C2)))
+    return BinaryOperator::CreateShl(ConstantExpr::getShl(C1, C2), A);
+
   return 0;    
 }