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

lower an expect intrinsic that is a constant expression.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176830 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index aa45ac5958..10e2dc6149 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/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;
   }