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[SCEV] Use SCEV::isAllOnesValue directly; NFC.

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Instead of `dyn_cast` ing to `SCEVConstant` and checking the contained
`ConstantInteger.

llvm-svn: 250251
This commit is contained in:
Sanjoy Das 2015-10-13 23:28:31 +00:00
parent 4b5a0d9544
commit 701aed0a6e
1 changed files with 4 additions and 8 deletions
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12
lib/Analysis/ScalarEvolution.cpp
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@ -7677,17 +7677,13 @@ bool ScalarEvolution::isImpliedCondOperands(ICmpInst::Predicate Pred,
/// If Expr computes ~A, return A else return nullptr
static const SCEV *MatchNotExpr(const SCEV *Expr) {
const SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(Expr);
if (!Add || Add->getNumOperands() != 2) return nullptr;
const SCEVConstant *AddLHS = dyn_cast<SCEVConstant>(Add->getOperand(0));
if (!(AddLHS && AddLHS->getValue()->getValue().isAllOnesValue()))
if (!Add || Add->getNumOperands() != 2 ||
!Add->getOperand(0)->isAllOnesValue())
return nullptr;
const SCEVMulExpr *AddRHS = dyn_cast<SCEVMulExpr>(Add->getOperand(1));
if (!AddRHS || AddRHS->getNumOperands() != 2) return nullptr;
const SCEVConstant *MulLHS = dyn_cast<SCEVConstant>(AddRHS->getOperand(0));
if (!(MulLHS && MulLHS->getValue()->getValue().isAllOnesValue()))
if (!AddRHS || AddRHS->getNumOperands() != 2 ||
!AddRHS->getOperand(0)->isAllOnesValue())
return nullptr;
return AddRHS->getOperand(1);