[CodeGenPrepare] Use APInt to check the value of the immediate in a and

while checking candidate for bit field extract.
Otherwise the value may not fit in uint64_t and this will trigger an
assertion.

This fixes PR19503.

llvm-svn: 206834

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 27fdd5187bd..573e3d7b8cd 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -639,9 +639,9 @@ bool isExtractBitsCandidateUse(Instruction *User) {
         !isa<ConstantInt>(User->getOperand(1)))
       return false;
 
-    unsigned Cimm = dyn_cast<ConstantInt>(User->getOperand(1))->getZExtValue();
+    const APInt &Cimm = cast<ConstantInt>(User->getOperand(1))->getValue();
 
-    if (Cimm & (Cimm + 1))
+    if ((Cimm & (Cimm + 1)).getBoolValue())
       return false;
   }
   return true;