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Remove simplifySelectInst/foldSelectWithBinaryOp #118913

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Merged
merged 2 commits into from
Dec 9, 2024
Merged

Remove simplifySelectInst/foldSelectWithBinaryOp #118913

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15e8e49
Remove simplifySelectInst/foldSelectWithBinaryOp that is superseded b…
glyh Dec 6, 2024
3eff30a
fix instsimplify testcases by moving them into instcombine
glyh Dec 7, 2024
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45 changes: 0 additions & 45 deletions llvm/lib/Analysis/InstructionSimplify.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -81,48 +81,6 @@ static Value *simplifyInstructionWithOperands(Instruction *I,
const SimplifyQuery &SQ,
unsigned MaxRecurse);

static Value *foldSelectWithBinaryOp(Value *Cond, Value *TrueVal,
Value *FalseVal) {
BinaryOperator::BinaryOps BinOpCode;
if (auto *BO = dyn_cast<BinaryOperator>(Cond))
BinOpCode = BO->getOpcode();
else
return nullptr;

CmpInst::Predicate ExpectedPred;
if (BinOpCode == BinaryOperator::Or) {
ExpectedPred = ICmpInst::ICMP_NE;
} else if (BinOpCode == BinaryOperator::And) {
ExpectedPred = ICmpInst::ICMP_EQ;
} else
return nullptr;

// %A = icmp eq %TV, %FV
// %B = icmp eq %X, %Y (and one of these is a select operand)
// %C = and %A, %B
// %D = select %C, %TV, %FV
// -->
// %FV

// %A = icmp ne %TV, %FV
// %B = icmp ne %X, %Y (and one of these is a select operand)
// %C = or %A, %B
// %D = select %C, %TV, %FV
// -->
// %TV
Value *X, *Y;
if (!match(Cond,
m_c_BinOp(m_c_SpecificICmp(ExpectedPred, m_Specific(TrueVal),
m_Specific(FalseVal)),
m_SpecificICmp(ExpectedPred, m_Value(X), m_Value(Y)))))
return nullptr;

if (X == TrueVal || X == FalseVal || Y == TrueVal || Y == FalseVal)
return BinOpCode == BinaryOperator::Or ? TrueVal : FalseVal;

return nullptr;
}

/// For a boolean type or a vector of boolean type, return false or a vector
/// with every element false.
static Constant *getFalse(Type *Ty) { return ConstantInt::getFalse(Ty); }
Expand Down Expand Up @@ -4994,9 +4952,6 @@ static Value *simplifySelectInst(Value *Cond, Value *TrueVal, Value *FalseVal,
if (Value *V = simplifySelectWithFCmp(Cond, TrueVal, FalseVal, Q, MaxRecurse))
return V;

if (Value *V = foldSelectWithBinaryOp(Cond, TrueVal, FalseVal))
return V;

std::optional<bool> Imp = isImpliedByDomCondition(Cond, Q.CxtI, Q.DL);
if (Imp)
return *Imp ? TrueVal : FalseVal;
Expand Down
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