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[VPlanPatternMatch] Introduce m_ConstantInt #159558

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Merged
merged 3 commits into from
Sep 21, 2025
Merged

[VPlanPatternMatch] Introduce m_ConstantInt #159558

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3aa9735
[VPlanPatternMatch] Introduce m_APInt
artagnon Sep 18, 2025
784ca14
[VPlan/PM] Introduce m_ConstantInt
artagnon Sep 18, 2025
b078dc2
[VPlan/PM] Remove indirection, strip dead code
artagnon Sep 18, 2025
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26 changes: 26 additions & 0 deletions llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,32 @@ inline int_pred_ty<is_zero_int> m_ZeroInt() {
/// For vectors, this includes constants with undefined elements.
inline int_pred_ty<is_one> m_One() { return int_pred_ty<is_one>(); }

struct apint_match {
const APInt *&Res;

apint_match(const APInt *&Res) : Res(Res) {}

bool match(VPValue *VPV) const {
if (!VPV->isLiveIn())
return false;
Value *V = VPV->getLiveInIRValue();
if (!V)
return false;
const auto *CI = dyn_cast<ConstantInt>(V);
if (!CI && V->getType()->isVectorTy())
if (const auto *C = dyn_cast<Constant>(V))
CI = dyn_cast_or_null<ConstantInt>(
C->getSplatValue(/*AllowPoison=*/false));
if (!CI)
return false;
Res = &CI->getValue();
return true;
}
};

/// Match an APInt, capturing it if we match.
inline apint_match m_APInt(const APInt *&C) { return C; }

/// Matching combinators
template <typename LTy, typename RTy> struct match_combine_or {
LTy L;
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9 changes: 5 additions & 4 deletions llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1592,11 +1592,12 @@ static bool tryToReplaceALMWithWideALM(VPlan &Plan, ElementCount VF,
m_ActiveLaneMask(m_VPValue(Index), m_VPValue(), m_VPValue()));
assert(Index && "Expected index from ActiveLaneMask instruction");

auto *II = dyn_cast<VPInstruction>(Index);
if (II && II->getOpcode() == VPInstruction::CanonicalIVIncrementForPart) {
auto Part = cast<ConstantInt>(II->getOperand(1)->getLiveInIRValue());
const APInt *Part;
if (match(Index,
m_VPInstruction<VPInstruction::CanonicalIVIncrementForPart>(
m_VPValue(), m_APInt(Part))))
Phis[Part->getZExtValue()] = Phi;
} else
else
// Anything other than a CanonicalIVIncrementForPart is part 0
Phis[0] = Phi;
}
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