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Support NE inequality in ValueRanges.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35724 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2007-04-07 04:49:12 +00:00
parent 46b58f7869
commit a995d920d5
1 changed files with 58 additions and 3 deletions
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61
lib/Transforms/Scalar/PredicateSimplifier.cpp
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@ -949,6 +949,60 @@ namespace {
update(V, CR, Subtree);
}
void addNotEquals(Value *V1, Value *V2, ETNode *Subtree, VRPSolver *VRP) {
uint32_t W = typeToWidth(V1->getType());
if (!W) return;
ConstantRange CR1 = rangeFromValue(V1, Subtree, W);
ConstantRange CR2 = rangeFromValue(V2, Subtree, W);
if (const APInt *I = CR1.getSingleElement()) {
if (CR2.isFullSet()) {
ConstantRange NewCR2(CR1.getUpper(), CR1.getLower());
applyRange(V2, NewCR2, Subtree, VRP);
} else if (*I == CR2.getLower()) {
APInt NewLower = CR2.getLower() + 1,
NewUpper = CR2.getUpper();
if (NewLower == NewUpper)
NewLower = NewUpper = APInt::getMinValue(W);
ConstantRange NewCR2(NewLower, NewUpper);
applyRange(V2, NewCR2, Subtree, VRP);
} else if (*I == CR2.getUpper() - 1) {
APInt NewLower = CR2.getLower(),
NewUpper = CR2.getUpper() - 1;
if (NewLower == NewUpper)
NewLower = NewUpper = APInt::getMinValue(W);
ConstantRange NewCR2(NewLower, NewUpper);
applyRange(V2, NewCR2, Subtree, VRP);
}
}
if (const APInt *I = CR2.getSingleElement()) {
if (CR1.isFullSet()) {
ConstantRange NewCR1(CR2.getUpper(), CR2.getLower());
applyRange(V1, NewCR1, Subtree, VRP);
} else if (*I == CR1.getLower()) {
APInt NewLower = CR1.getLower() + 1,
NewUpper = CR1.getUpper();
if (NewLower == NewUpper)
NewLower = NewUpper = APInt::getMinValue(W);
ConstantRange NewCR1(NewLower, NewUpper);
applyRange(V1, NewCR1, Subtree, VRP);
} else if (*I == CR1.getUpper() - 1) {
APInt NewLower = CR1.getLower(),
NewUpper = CR1.getUpper() - 1;
if (NewLower == NewUpper)
NewLower = NewUpper = APInt::getMinValue(W);
ConstantRange NewCR1(NewLower, NewUpper);
applyRange(V1, NewCR1, Subtree, VRP);
}
}
}
void addInequality(Value *V1, Value *V2, ETNode *Subtree, LatticeVal LV,
VRPSolver *VRP) {
assert(!isRelatedBy(V1, V2, Subtree, LV) && "Asked to do useless work.");
@ -956,9 +1010,10 @@ namespace {
assert(isCanonical(V1, Subtree, VRP) && "Value not canonical.");
assert(isCanonical(V2, Subtree, VRP) && "Value not canonical.");
if (LV == NE) return; // we can't represent those.
// XXX: except in the case where isSingleElement and equal to either
// Lower or Upper. That's probably not profitable. (Type::Int1Ty?)
if (LV == NE) {
addNotEquals(V1, V2, Subtree, VRP);
return;
}
uint32_t W = typeToWidth(V1->getType());
if (!W) return;