if (const auto *ICI = dyn_cast<ICmpInst>(CondVal)) {
Value *X;
const APInt *Y;
- if (ICI->isEquality() &&
+ ICmpInst::Predicate Pred = ICI->getPredicate();
+ if (ICmpInst::isEquality(Pred) &&
match(ICI->getOperand(0), m_And(m_Value(X), m_APInt(Y))) &&
match(ICI->getOperand(1), m_Zero())) {
- ICmpInst::Predicate Pred = ICI->getPredicate();
const APInt *C;
// (X & Y) == 0 ? X & ~Y : X --> X
// (X & Y) != 0 ? X & ~Y : X --> X & ~Y
return Pred == ICmpInst::ICMP_EQ ? TrueVal : FalseVal;
}
}
+ if (Pred == ICmpInst::ICMP_SLT && match(ICI->getOperand(1), m_Zero())) {
+ // (X < 0) ? X : X | SignBit --> X | SignBit
+ if (TrueVal == ICI->getOperand(0) &&
+ match(FalseVal, m_Or(m_Specific(TrueVal), m_SignBit())))
+ return FalseVal;
+ // (X < 0) ? X | SignBit : X --> X
+ if (FalseVal == ICI->getOperand(0) &&
+ match(TrueVal, m_Or(m_Specific(FalseVal), m_SignBit())))
+ return FalseVal;
+ // (X < 0) ? X & INT_MAX : X --> X & INT_MAX
+ if (FalseVal == ICI->getOperand(0) &&
+ match(TrueVal, m_And(m_Specific(FalseVal), m_MaxSignedValue())))
+ return TrueVal;
+ // (X < 0) ? X : X & INT_MAX --> X
+ if (TrueVal == ICI->getOperand(0) &&
+ match(FalseVal, m_And(m_Specific(TrueVal), m_MaxSignedValue())))
+ return TrueVal;
+ }
+ if (Pred == ICmpInst::ICMP_SGT && match(ICI->getOperand(1), m_AllOnes())) {
+ // (X > -1) ? X : X | SignBit --> X
+ if (TrueVal == ICI->getOperand(0) &&
+ match(FalseVal, m_Or(m_Specific(TrueVal), m_SignBit())))
+ return TrueVal;
+ // (X > -1) ? X | SignBit : X --> X | SignBit
+ if (FalseVal == ICI->getOperand(0) &&
+ match(TrueVal, m_Or(m_Specific(FalseVal), m_SignBit())))
+ return TrueVal;
+ // (X > -1) ? X & INT_MAX : X --> X
+ if (FalseVal == ICI->getOperand(0) &&
+ match(TrueVal, m_And(m_Specific(FalseVal), m_MaxSignedValue())))
+ return FalseVal;
+ // (X > -1) ? X : X & INT_MAX --> X & INT_MAX
+ if (TrueVal == ICI->getOperand(0) &&
+ match(FalseVal, m_And(m_Specific(TrueVal), m_MaxSignedValue())))
+ return FalseVal;
+ }
}
return nullptr;