Add support for constant expr casts

llvm-svn: 12564

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/VMCore/Constants.cpp b/llvm/lib/VMCore/Constants.cpp
index f29f3157c8e..6c6557dccde 100644
--- a/llvm/lib/VMCore/Constants.cpp
+++ b/llvm/lib/VMCore/Constants.cpp
@@ -571,6 +571,14 @@ void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
   } else if (getOpcode() == Instruction::Cast) {
     assert(getOperand(0) == From && "Cast only has one use!");
     Replacement = ConstantExpr::getCast(To, getType());
+  } else if (getOpcode() == Instruction::Select) {
+    Constant *C1 = getOperand(0);
+    Constant *C2 = getOperand(1);
+    Constant *C3 = getOperand(2);
+    if (C1 == From) C1 = To;
+    if (C2 == From) C2 = To;
+    if (C3 == From) C3 = To;
+    Replacement = ConstantExpr::getSelect(C1, C2, C3);
   } else if (getNumOperands() == 2) {
     Constant *C1 = getOperand(0);
     Constant *C2 = getOperand(1);