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[NFC][SCEV] Add 'getMinusOne()' method

This commit is contained in:
Roman Lebedev 2020-10-17 16:24:49 +03:00
parent bd6d41f52e
commit be1678bdb9
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GPG Key ID: 083C3EBB4A1689E0
2 changed files with 7 additions and 5 deletions
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5
llvm/include/llvm/Analysis/ScalarEvolution.h
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@ -591,6 +591,11 @@ public:
/// Return a SCEV for the constant 1 of a specific type.
const SCEV *getOne(Type *Ty) { return getConstant(Ty, 1); }
/// Return a SCEV for the constant -1 of a specific type.
const SCEV *getMinusOne(Type *Ty) {
return getConstant(Ty, -1, /*isSigned=*/true);
}
/// Return an expression for sizeof AllocTy that is type IntTy
const SCEV *getSizeOfExpr(Type *IntTy, Type *AllocTy);

7
llvm/lib/Analysis/ScalarEvolution.cpp
View File

@ -3746,8 +3746,7 @@ const SCEV *ScalarEvolution::getNegativeSCEV(const SCEV *V,
Type *Ty = V->getType();
Ty = getEffectiveSCEVType(Ty);
return getMulExpr(
V, getConstant(cast<ConstantInt>(Constant::getAllOnesValue(Ty))), Flags);
return getMulExpr(V, getMinusOne(Ty), Flags);
}
/// If Expr computes ~A, return A else return nullptr
@ -3791,9 +3790,7 @@ const SCEV *ScalarEvolution::getNotSCEV(const SCEV *V) {
Type *Ty = V->getType();
Ty = getEffectiveSCEVType(Ty);
const SCEV *AllOnes =
getConstant(cast<ConstantInt>(Constant::getAllOnesValue(Ty)));
return getMinusSCEV(AllOnes, V);
return getMinusSCEV(getMinusOne(Ty), V);
}
const SCEV *ScalarEvolution::getMinusSCEV(const SCEV *LHS, const SCEV *RHS,