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[InstCombine] replace isa/cast with dyn_cast; NFC 

llvm-svn: 325141
This commit is contained in:
Sanjay Patel 2018-02-14 16:56:44 +00:00
parent 604cb9e3ed
commit 58dab856f7
1 changed files with 2 additions and 3 deletions
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5
llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
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@ -596,19 +596,18 @@ Instruction *InstCombiner::visitFMul(BinaryOperator &I) {
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.