Add constant folding wrapper support for select instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12319 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp
index 821d1e13ebc5ba4d5c413e29e7f9b794f83293c9..c54765b42785177f7416814de93e276222944a7b 100644 (file)
--- a/lib/Transforms/Utils/Local.cpp
+++ b/lib/Transforms/Utils/Local.cpp
@@ -79,6 +79,10 @@ Constant *llvm::ConstantFoldInstruction(Instruction *I) {
   default: return 0;
   case Instruction::Cast:
     return ConstantExpr::getCast(Op0, I->getType());
+  case Instruction::Select:
+    if (Constant *Op2 = dyn_cast<Constant>(I->getOperand(2)))
+      return ConstantExpr::getSelect(Op0, Op1, Op2);
+    return 0;
   case Instruction::GetElementPtr:
     std::vector<Constant*> IdxList;
     IdxList.reserve(I->getNumOperands()-1);