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Prefer non-virtual calls to ConstantInt::isZero over virtual calls to

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Constant::isNullValue() in situations where it is possible.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34821 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
2007-03-02 00:28:52 +00:00
parent 34da0ac28f
commit cae5754619
9 changed files with 46 additions and 42 deletions
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12
lib/Analysis/ScalarEvolution.cpp
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@ -617,7 +617,7 @@ SCEVHandle SCEVAddExpr::get(std::vector<SCEVHandle> &Ops) {
}
// If we are left with a constant zero being added, strip it off.
if (cast<SCEVConstant>(Ops[0])->getValue()->isNullValue()) {
if (cast<SCEVConstant>(Ops[0])->getValue()->isZero()) {
Ops.erase(Ops.begin());
--Idx;
}
@ -857,7 +857,7 @@ SCEVHandle SCEVMulExpr::get(std::vector<SCEVHandle> &Ops) {
if (cast<SCEVConstant>(Ops[0])->getValue()->equalsInt(1)) {
Ops.erase(Ops.begin());
--Idx;
} else if (cast<SCEVConstant>(Ops[0])->getValue()->isNullValue()) {
} else if (cast<SCEVConstant>(Ops[0])->getValue()->isZero()) {
// If we have a multiply of zero, it will always be zero.
return Ops[0];
}
@ -1026,7 +1026,7 @@ SCEVHandle SCEVAddRecExpr::get(std::vector<SCEVHandle> &Operands,
if (Operands.size() == 1) return Operands[0];
if (SCEVConstant *StepC = dyn_cast<SCEVConstant>(Operands.back()))
if (StepC->getValue()->isNullValue()) {
if (StepC->getValue()->isZero()) {
Operands.pop_back();
return get(Operands, L); // { X,+,0 } --> X
}
@ -2124,7 +2124,7 @@ SCEVHandle ScalarEvolutionsImpl::HowFarToZero(SCEV *V, const Loop *L) {
// If the value is a constant
if (SCEVConstant *C = dyn_cast<SCEVConstant>(V)) {
// If the value is already zero, the branch will execute zero times.
if (C->getValue()->isNullValue()) return C;
if (C->getValue()->isZero()) return C;
return UnknownValue; // Otherwise it will loop infinitely.
}
@ -2187,7 +2187,7 @@ SCEVHandle ScalarEvolutionsImpl::HowFarToZero(SCEV *V, const Loop *L) {
// should not accept a root of 2.
SCEVHandle Val = AddRec->evaluateAtIteration(R1);
if (SCEVConstant *EvalVal = dyn_cast<SCEVConstant>(Val))
if (EvalVal->getValue()->isNullValue())
if (EvalVal->getValue()->isZero())
return R1; // We found a quadratic root!
}
}
@ -2327,7 +2327,7 @@ SCEVHandle SCEVAddRecExpr::getNumIterationsInRange(ConstantRange Range,
// If the start is a non-zero constant, shift the range to simplify things.
if (SCEVConstant *SC = dyn_cast<SCEVConstant>(getStart()))
if (!SC->getValue()->isNullValue()) {
if (!SC->getValue()->isZero()) {
std::vector<SCEVHandle> Operands(op_begin(), op_end());
Operands[0] = SCEVUnknown::getIntegerSCEV(0, SC->getType());
SCEVHandle Shifted = SCEVAddRecExpr::get(Operands, getLoop());