[NewGVN] Use a cast instead of a dyn_cast.

Differential Revision: https://reviews.llvm.org/D36478

llvm-svn: 310397

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Scalar/NewGVN.cpp b/llvm/lib/Transforms/Scalar/NewGVN.cpp
index d6e34666112..e620ae9c557 100644
--- a/llvm/lib/Transforms/Scalar/NewGVN.cpp
+++ b/llvm/lib/Transforms/Scalar/NewGVN.cpp
@@ -1711,7 +1711,9 @@ NewGVN::performSymbolicAggrValueEvaluation(Instruction *I) const {
   return createAggregateValueExpression(I);
 }
 const Expression *NewGVN::performSymbolicCmpEvaluation(Instruction *I) const {
-  auto *CI = dyn_cast<CmpInst>(I);
+  assert(isa<CmpInst>(I) && "Expected a cmp instruction.");
+
+  auto *CI = cast<CmpInst>(I);
   // See if our operands are equal to those of a previous predicate, and if so,
   // if it implies true or false.
   auto Op0 = lookupOperandLeader(CI->getOperand(0));