[InstCombine] replace isa/cast with dyn_cast; NFC
llvm-svn: 325141
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
index f884221..e853a7b 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
@@ -596,19 +596,18 @@
bool AllowReassociate = I.isFast();
// Simplify mul instructions with a constant RHS.
- if (isa<Constant>(Op1)) {
+ if (auto *C = dyn_cast<Constant>(Op1)) {
if (Instruction *FoldedMul = foldOpWithConstantIntoOperand(I))
return FoldedMul;
// (fmul X, -1.0) --> (fsub -0.0, X)
- if (match(Op1, m_SpecificFP(-1.0))) {
+ if (match(C, m_SpecificFP(-1.0))) {
Constant *NegZero = ConstantFP::getNegativeZero(Op1->getType());
Instruction *RI = BinaryOperator::CreateFSub(NegZero, Op0);
RI->copyFastMathFlags(&I);
return RI;
}
- Constant *C = cast<Constant>(Op1);
if (AllowReassociate && isFiniteNonZeroFp(C)) {
// Let MDC denote an expression in one of these forms:
// X * C, C/X, X/C, where C is a constant.