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Move LSR's private isZero function to a public SCEV member

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function, and make use of it in several places.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52463 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-06-18 16:23:07 +00:00
parent a9c0f2b03f
commit cfeb6a4506
4 changed files with 24 additions and 27 deletions
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lib/Analysis/ScalarEvolution.cpp
+12 -8
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@@ -132,6 +132,12 @@ uint32_t SCEV::getBitWidth() const {
return 0;
}
bool SCEV::isZero() const {
if (const SCEVConstant *SC = dyn_cast<SCEVConstant>(this))
return SC->getValue()->isZero();
return false;
}
SCEVCouldNotCompute::SCEVCouldNotCompute() : SCEV(scCouldNotCompute) {}
@@ -1136,11 +1142,10 @@ SCEVHandle ScalarEvolution::getAddRecExpr(std::vector<SCEVHandle> &Operands,
const Loop *L) {
if (Operands.size() == 1) return Operands[0];
if (SCEVConstant *StepC = dyn_cast<SCEVConstant>(Operands.back()))
if (StepC->getValue()->isZero()) {
Operands.pop_back();
return getAddRecExpr(Operands, L); // { X,+,0 } --> X
}
if (Operands.back()->isZero()) {
Operands.pop_back();
return getAddRecExpr(Operands, L); // { X,+,0 } --> X
}
SCEVAddRecExpr *&Result =
(*SCEVAddRecExprs)[std::make_pair(L, std::vector<SCEV*>(Operands.begin(),
@@ -2583,9 +2588,8 @@ SCEVHandle ScalarEvolutionsImpl::HowFarToZero(SCEV *V, const Loop *L) {
// value at this index. When solving for "X*X != 5", for example, we
// should not accept a root of 2.
SCEVHandle Val = AddRec->evaluateAtIteration(R1, SE);
if (SCEVConstant *EvalVal = dyn_cast<SCEVConstant>(Val))
if (EvalVal->getValue()->isZero())
return R1; // We found a quadratic root!
if (Val->isZero())
return R1; // We found a quadratic root!
}
}
}