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[InstSimplify] reduce code duplication in simplifyICmpWithMinMax(); NFC

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This commit is contained in:
Sanjay Patel 2020-08-05 11:30:25 -04:00
parent c3fca9996d
commit fb7a244b8e
1 changed files with 12 additions and 29 deletions
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41
lib/Analysis/InstructionSimplify.cpp
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@ -3174,55 +3174,38 @@ static Value *simplifyICmpWithMinMax(CmpInst::Predicate Pred, Value *LHS,
break;
}
case CmpInst::ICMP_UGE:
// Always true.
return getTrue(ITy);
case CmpInst::ICMP_ULT:
// Always false.
return getFalse(ITy);
}
}
// Variants on "max(x,y) >= min(x,z)".
// Comparing 1 each of min/max with a common operand?
// Canonicalize min operand to RHS.
if (match(LHS, m_UMin(m_Value(), m_Value())) ||
match(LHS, m_SMin(m_Value(), m_Value()))) {
std::swap(LHS, RHS);
Pred = ICmpInst::getSwappedPredicate(Pred);
}
Value *C, *D;
if (match(LHS, m_SMax(m_Value(A), m_Value(B))) &&
match(RHS, m_SMin(m_Value(C), m_Value(D))) &&
(A == C || A == D || B == C || B == D)) {
// max(x, ?) pred min(x, ?).
// smax(A, B) >=s smin(A, D) --> true
if (Pred == CmpInst::ICMP_SGE)
// Always true.
return getTrue(ITy);
// smax(A, B) <s smin(A, D) --> false
if (Pred == CmpInst::ICMP_SLT)
// Always false.
return getFalse(ITy);
} else if (match(LHS, m_SMin(m_Value(A), m_Value(B))) &&
match(RHS, m_SMax(m_Value(C), m_Value(D))) &&
(A == C || A == D || B == C || B == D)) {
// min(x, ?) pred max(x, ?).
if (Pred == CmpInst::ICMP_SLE)
// Always true.
return getTrue(ITy);
if (Pred == CmpInst::ICMP_SGT)
// Always false.
return getFalse(ITy);
} else if (match(LHS, m_UMax(m_Value(A), m_Value(B))) &&
match(RHS, m_UMin(m_Value(C), m_Value(D))) &&
(A == C || A == D || B == C || B == D)) {
// max(x, ?) pred min(x, ?).
// umax(A, B) >=u umin(A, D) --> true
if (Pred == CmpInst::ICMP_UGE)
// Always true.
return getTrue(ITy);
// umax(A, B) <u umin(A, D) --> false
if (Pred == CmpInst::ICMP_ULT)
// Always false.
return getFalse(ITy);
} else if (match(LHS, m_UMin(m_Value(A), m_Value(B))) &&
match(RHS, m_UMax(m_Value(C), m_Value(D))) &&
(A == C || A == D || B == C || B == D)) {
// min(x, ?) pred max(x, ?).
if (Pred == CmpInst::ICMP_ULE)
// Always true.
return getTrue(ITy);
if (Pred == CmpInst::ICMP_UGT)
// Always false.
return getFalse(ITy);
}