Fix a recently added optimization to not crash on vectors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51471 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 16 insertions, 2 deletions

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 13dbc11..a398884 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -3276,8 +3276,16 @@ Instruction *InstCombiner::commonIDivTransforms(BinaryOperator &I) {
   Value *Op0 = I.getOperand(0), *Op1 = I.getOperand(1);
 
   // (sdiv X, X) --> 1     (udiv X, X) --> 1
-  if (Op0 == Op1)
-    return ReplaceInstUsesWith(I, ConstantInt::get(I.getType(), 1));
+  if (Op0 == Op1) {
+    if (const VectorType *Ty = dyn_cast<VectorType>(I.getType())) {
+      ConstantInt *CI = ConstantInt::get(Ty->getElementType(), 1);
+      std::vector<Constant*> Elts(Ty->getNumElements(), CI);
+      return ReplaceInstUsesWith(I, ConstantVector::get(Elts));
+    }
+
+    ConstantInt *CI = ConstantInt::get(I.getType(), 1);
+    return ReplaceInstUsesWith(I, CI);
+  }
   
   if (Instruction *Common = commonDivTransforms(I))
     return Common;
diff --git a/test/Transforms/InstCombine/2008-05-22-IDivVector.ll b/test/Transforms/InstCombine/2008-05-22-IDivVector.ll
new file mode 100644
index 0000000..ad70b65
--- /dev/null
+++ b/test/Transforms/InstCombine/2008-05-22-IDivVector.ll
@@ -0,0 +1,6 @@
+; RUN: llvm-as < %s | opt -instcombine -disable-output
+
+define <3 x i8> @f(<3 x i8> %i) {
+  %A = sdiv <3 x i8> %i, %i
+  ret <3 x i8> %A
+}