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[DAG] Add SpecificFP matcher #167438

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[DAG] Add SpecificFP matcher #167438

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22 changes: 22 additions & 0 deletions llvm/include/llvm/CodeGen/SDPatternMatch.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1144,6 +1144,28 @@ inline SpecificInt_match m_SpecificInt(uint64_t V) {
return SpecificInt_match(APInt(64, V));
}

struct SpecificFP_match {
APFloat Val;

explicit SpecificFP_match(APFloat V) : Val(V) {}

template <typename MatchContext>
bool match(const MatchContext &Ctx, SDValue V) {
if (const auto *CFP = dyn_cast<ConstantFPSDNode>(V.getNode()))
return CFP->isExactlyValue(Val);
if (ConstantFPSDNode *C = isConstOrConstSplatFP(V, /*AllowUndefs=*/true))
return C->getValueAPF().compare(Val) == APFloat::cmpEqual;
return false;
}
};

/// Match a specific float constant.
inline SpecificFP_match m_SpecificFP(APFloat V) { return SpecificFP_match(V); }

inline SpecificFP_match m_SpecificFP(double V) {
return SpecificFP_match(APFloat(V));
}

struct Zero_match {
bool AllowUndefs;

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29 changes: 29 additions & 0 deletions llvm/unittests/CodeGen/SelectionDAGPatternMatchTest.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -354,6 +354,35 @@ TEST_F(SelectionDAGPatternMatchTest, matchBinaryOp) {
sd_match(InsertELT, m_InsertElt(m_Value(), m_Value(), m_SpecificInt(1))));
}

TEST_F(SelectionDAGPatternMatchTest, matchSpecificFpOp) {
SDLoc DL;
APFloat Value(1.5f);
auto Float32VT = EVT::getFloatingPointVT(32);
SDValue Op0 = DAG->getCopyFromReg(DAG->getEntryNode(), DL, 1, Float32VT);
SDValue Op1 = DAG->getConstantFP(Value, DL, Float32VT);
SDValue FAdd = DAG->getNode(ISD::FADD, DL, Float32VT, Op0, Op1);

using namespace SDPatternMatch;

EXPECT_TRUE(sd_match(Op1, m_SpecificFP(Value)));
EXPECT_TRUE(
sd_match(FAdd, m_BinOp(ISD::FADD, m_Specific(Op0), m_SpecificFP(Value))));
EXPECT_TRUE(sd_match(
FAdd, m_c_BinOp(ISD::FADD, m_SpecificFP(Value), m_Specific(Op0))));

auto VFloat32VT = EVT::getVectorVT(Context, Float32VT, 2);
SDValue VOp0 = DAG->getSplat(VFloat32VT, DL, Op0);
SDValue VOp1 = DAG->getSplat(VFloat32VT, DL, Op1);

EXPECT_TRUE(sd_match(VOp1, m_SpecificFP(Value)));

SDValue VFAdd = DAG->getNode(ISD::FADD, DL, VFloat32VT, VOp0, VOp1);
EXPECT_TRUE(sd_match(
VFAdd, m_BinOp(ISD::FADD, m_Specific(VOp0), m_SpecificFP(Value))));
EXPECT_TRUE(sd_match(
VFAdd, m_c_BinOp(ISD::FADD, m_SpecificFP(Value), m_Specific(VOp0))));
}

TEST_F(SelectionDAGPatternMatchTest, matchGenericTernaryOp) {
SDLoc DL;
auto Float32VT = EVT::getFloatingPointVT(32);
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