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[LVI] NFC. Extract LHS, RHS, Predicate locals in getValueFromCondition

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llvm-svn: 278007
This commit is contained in:
Artur Pilipenko 2016-08-08 14:08:37 +00:00
parent 77684f300a
commit 0f733d0a7f
1 changed files with 14 additions and 11 deletions
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25
lib/Analysis/LazyValueInfo.cpp
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@ -1183,30 +1183,33 @@ bool getValueFromCondition(Value *Val, Value *Cond, LVILatticeVal &Result,
if (!ICI)
return false;
if (isa<Constant>(ICI->getOperand(1))) {
if (ICI->isEquality() && ICI->getOperand(0) == Val) {
Value *LHS = ICI->getOperand(0);
Value *RHS = ICI->getOperand(1);
CmpInst::Predicate Predicate = ICI->getPredicate();
if (isa<Constant>(RHS)) {
if (ICI->isEquality() && LHS == Val) {
// We know that V has the RHS constant if this is a true SETEQ or
// false SETNE.
if (isTrueDest == (ICI->getPredicate() == ICmpInst::ICMP_EQ))
Result = LVILatticeVal::get(cast<Constant>(ICI->getOperand(1)));
if (isTrueDest == (Predicate == ICmpInst::ICMP_EQ))
Result = LVILatticeVal::get(cast<Constant>(RHS));
else
Result = LVILatticeVal::getNot(cast<Constant>(ICI->getOperand(1)));
Result = LVILatticeVal::getNot(cast<Constant>(RHS));
return true;
}
// Recognize the range checking idiom that InstCombine produces.
// (X-C1) u< C2 --> [C1, C1+C2)
ConstantInt *NegOffset = nullptr;
if (ICI->getPredicate() == ICmpInst::ICMP_ULT)
match(ICI->getOperand(0), m_Add(m_Specific(Val),
m_ConstantInt(NegOffset)));
if (Predicate == ICmpInst::ICMP_ULT)
match(LHS, m_Add(m_Specific(Val), m_ConstantInt(NegOffset)));
ConstantInt *CI = dyn_cast<ConstantInt>(ICI->getOperand(1));
if (CI && (ICI->getOperand(0) == Val || NegOffset)) {
ConstantInt *CI = dyn_cast<ConstantInt>(RHS);
if (CI && (LHS == Val || NegOffset)) {
// Calculate the range of values that are allowed by the comparison
ConstantRange CmpRange(CI->getValue());
ConstantRange TrueValues =
ConstantRange::makeAllowedICmpRegion(ICI->getPredicate(), CmpRange);
ConstantRange::makeAllowedICmpRegion(Predicate, CmpRange);
if (NegOffset) // Apply the offset from above.
TrueValues = TrueValues.subtract(NegOffset->getValue());