Fix a crasher newly introduced in r176659/r176649, where fast-isel tries to

lower an expect intrinsic that is a constant expression.

llvm-svn: 176830

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
index aa45ac59581..10e2dc61499 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -698,6 +698,8 @@ bool FastISel::SelectCall(const User *I) {
   }
   case Intrinsic::expect: {
     unsigned ResultReg = getRegForValue(Call->getArgOperand(0));
+    if (ResultReg == 0)
+      return false;
     UpdateValueMap(Call, ResultReg);
     return true;
   }