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[DAG] Add SDPatternMatch m_ZExtOrSelf/m_SExtOrSelf/m_AExtOrSelf/m_TruncOrSelf matchers #85480

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merged 1 commit into from Mar 20, 2024
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[DAG] Add SDPatternMatch m_ZExtOrSelf/m_SExtOrSelf/m_AExtOrSelf/m_TruncOrSelf matchers #85480

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33 changes: 33 additions & 0 deletions llvm/include/llvm/CodeGen/SDPatternMatch.h
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Expand Up @@ -632,6 +632,38 @@ template <typename Opnd> inline UnaryOpc_match<Opnd> m_Trunc(const Opnd &Op) {
return UnaryOpc_match<Opnd>(ISD::TRUNCATE, Op);
}

/// Match a zext or identity
/// Allows to peek through optional extensions
template <typename Opnd>
inline Or<UnaryOpc_match<Opnd>, Opnd> m_ZExtOrSelf(Opnd &&Op) {
return Or<UnaryOpc_match<Opnd>, Opnd>(m_ZExt(std::forward<Opnd>(Op)),
std::forward<Opnd>(Op));
}

/// Match a sext or identity
/// Allows to peek through optional extensions
template <typename Opnd>
inline Or<UnaryOpc_match<Opnd>, Opnd> m_SExtOrSelf(Opnd &&Op) {
return Or<UnaryOpc_match<Opnd>, Opnd>(m_SExt(std::forward<Opnd>(Op)),
std::forward<Opnd>(Op));
}

/// Match a aext or identity
/// Allows to peek through optional extensions
template <typename Opnd>
inline Or<UnaryOpc_match<Opnd>, Opnd> m_AExtOrSelf(Opnd &&Op) {
return Or<UnaryOpc_match<Opnd>, Opnd>(m_AnyExt(std::forward<Opnd>(Op)),
std::forward<Opnd>(Op));
}

/// Match a trunc or identity
/// Allows to peek through optional truncations
template <typename Opnd>
inline Or<UnaryOpc_match<Opnd>, Opnd> m_TruncOrSelf(Opnd &&Op) {
return Or<UnaryOpc_match<Opnd>, Opnd>(m_Trunc(std::forward<Opnd>(Op)),
std::forward<Opnd>(Op));
}

// === Constants ===
struct ConstantInt_match {
APInt *BindVal;
Expand Down Expand Up @@ -737,6 +769,7 @@ template <typename ValTy>
inline BinaryOpc_match<ValTy, SpecificInt_match, true> m_Not(const ValTy &V) {
return m_Xor(V, m_AllOnes());
}

} // namespace SDPatternMatch
} // namespace llvm
#endif
32 changes: 32 additions & 0 deletions llvm/unittests/CodeGen/SelectionDAGPatternMatchTest.cpp
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Expand Up @@ -251,6 +251,38 @@ TEST_F(SelectionDAGPatternMatchTest, patternCombinators) {
EXPECT_TRUE(sd_match(Add, m_AllOf(m_Opc(ISD::ADD), m_OneUse())));
}

TEST_F(SelectionDAGPatternMatchTest, optionalResizing) {
SDLoc DL;
auto Int32VT = EVT::getIntegerVT(Context, 32);
auto Int64VT = EVT::getIntegerVT(Context, 64);

SDValue Op32 = DAG->getCopyFromReg(DAG->getEntryNode(), DL, 1, Int32VT);
SDValue Op64 = DAG->getCopyFromReg(DAG->getEntryNode(), DL, 1, Int64VT);
SDValue ZExt = DAG->getNode(ISD::ZERO_EXTEND, DL, Int64VT, Op32);
SDValue SExt = DAG->getNode(ISD::SIGN_EXTEND, DL, Int64VT, Op32);
SDValue AExt = DAG->getNode(ISD::ANY_EXTEND, DL, Int64VT, Op32);
SDValue Trunc = DAG->getNode(ISD::TRUNCATE, DL, Int32VT, Op64);

using namespace SDPatternMatch;
SDValue A;
EXPECT_TRUE(sd_match(Op32, m_ZExtOrSelf(m_Value(A))));
EXPECT_TRUE(A == Op32);
EXPECT_TRUE(sd_match(ZExt, m_ZExtOrSelf(m_Value(A))));
EXPECT_TRUE(A == Op32);
EXPECT_TRUE(sd_match(Op64, m_SExtOrSelf(m_Value(A))));
EXPECT_TRUE(A == Op64);
EXPECT_TRUE(sd_match(SExt, m_SExtOrSelf(m_Value(A))));
EXPECT_TRUE(A == Op32);
EXPECT_TRUE(sd_match(Op32, m_AExtOrSelf(m_Value(A))));
EXPECT_TRUE(A == Op32);
EXPECT_TRUE(sd_match(AExt, m_AExtOrSelf(m_Value(A))));
EXPECT_TRUE(A == Op32);
EXPECT_TRUE(sd_match(Op64, m_TruncOrSelf(m_Value(A))));
EXPECT_TRUE(A == Op64);
EXPECT_TRUE(sd_match(Trunc, m_TruncOrSelf(m_Value(A))));
EXPECT_TRUE(A == Op64);
}

TEST_F(SelectionDAGPatternMatchTest, matchNode) {
SDLoc DL;
auto Int32VT = EVT::getIntegerVT(Context, 32);
Expand Down