[llvm-commits] [llvm] r139007 - /llvm/trunk/lib/VMCore/ConstantFold.cpp

[Jakub Staszak]

Author: kuba
Date: Fri Sep  2 12:01:40 2011
New Revision: 139007

URL: http://llvm.org/viewvc/llvm-project?rev=139007&view=rev
Log:
Return undef value (instead of arbitrary) for wrong or undef index in
ConstantVector.

Modified:
    llvm/trunk/lib/VMCore/ConstantFold.cpp

Modified: llvm/trunk/lib/VMCore/ConstantFold.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/VMCore/ConstantFold.cpp?rev=139007&r1=139006&r2=139007&view=diff
==============================================================================
--- llvm/trunk/lib/VMCore/ConstantFold.cpp (original)
+++ llvm/trunk/lib/VMCore/ConstantFold.cpp Fri Sep  2 12:01:40 2011
@@ -763,12 +763,12 @@
     if (ConstantInt *CIdx = dyn_cast<ConstantInt>(Idx)) {
       uint64_t Index = CIdx->getZExtValue();
       if (Index >= CVal->getNumOperands())
-        // ee({w,x,y,z}, wrong_value) -> w (an arbitrary value).
-        return CVal->getOperand(0);
+        // ee({w,x,y,z}, wrong_value) -> undef
+        return UndefValue::get(cast<VectorType>(Val->getType())->getElementType());
       return CVal->getOperand(CIdx->getZExtValue());
     } else if (isa<UndefValue>(Idx)) {
-      // ee({w,x,y,z}, undef) -> w (an arbitrary value).
-      return CVal->getOperand(0);
+      // ee({w,x,y,z}, undef) -> undef
+      return UndefValue::get(cast<VectorType>(Val->getType())->getElementType());
     }
   }
   return 0;