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[MIPatternMatch]: Add mi_match for MachineInstr

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This utility allows more efficient start of pattern match.
Often MachineInstr(MI) is available and instead of using
mi_match(MI.getOperand(0).getReg(), MRI, ...) followed by
MRI.getVRegDef(Reg) that gives back MI we now use
mi_match(MI, MRI, ...).

Differential Revision: https://reviews.llvm.org/D99735
This commit is contained in:
Petar Avramovic 2021-04-27 11:08:16 +02:00
parent 00669818e5
commit 692456b891
2 changed files with 41 additions and 0 deletions
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10
include/llvm/CodeGen/GlobalISel/MIPatternMatch.h
View File

@ -25,6 +25,11 @@ bool mi_match(Reg R, const MachineRegisterInfo &MRI, Pattern &&P) {
return P.match(MRI, R);
}
template <typename Pattern>
bool mi_match(MachineInstr &MI, const MachineRegisterInfo &MRI, Pattern &&P) {
return P.match(MRI, &MI);
}
// TODO: Extend for N use.
template <typename SubPatternT> struct OneUse_match {
SubPatternT SubPat;
@ -182,6 +187,11 @@ template <> struct bind_helper<MachineInstr *> {
return true;
return false;
}
static bool bind(const MachineRegisterInfo &MRI, MachineInstr *&MI,
MachineInstr *Inst) {
MI = Inst;
return MI;
}
};
template <> struct bind_helper<LLT> {

31
unittests/CodeGen/GlobalISel/PatternMatchTest.cpp
View File

@ -51,6 +51,37 @@ TEST_F(AArch64GISelMITest, MatchIntConstantRegister) {
EXPECT_EQ(Src0, MIBCst.getReg(0));
}
TEST_F(AArch64GISelMITest, MachineInstrPtrBind) {
setUp();
if (!TM)
return;
auto MIBAdd = B.buildAdd(LLT::scalar(64), Copies[0], Copies[1]);
// Test 'MachineInstr *' bind.
// Default mi_match.
MachineInstr *MIPtr = MIBAdd.getInstr();
bool match = mi_match(MIPtr, *MRI, m_GAdd(m_Reg(), m_Reg()));
EXPECT_TRUE(match);
// Specialized mi_match for MachineInstr &.
MachineInstr &MI = *MIBAdd.getInstr();
match = mi_match(MI, *MRI, m_GAdd(m_Reg(), m_Reg()));
EXPECT_TRUE(match);
// MachineInstrBuilder has automatic conversion to MachineInstr *.
match = mi_match(MIBAdd, *MRI, m_GAdd(m_Reg(), m_Reg()));
EXPECT_TRUE(match);
// Match instruction without def.
auto MIBBrcond = B.buildBrCond(Copies[0], B.getMBB());
MachineInstr *MatchedMI;
match = mi_match(MIBBrcond, *MRI, m_MInstr(MatchedMI));
EXPECT_TRUE(match);
EXPECT_TRUE(MIBBrcond.getInstr() == MatchedMI);
// Match instruction with two defs.
auto MIBUAddO =
B.buildUAddo(LLT::scalar(64), LLT::scalar(1), Copies[0], Copies[1]);
match = mi_match(MIBUAddO, *MRI, m_MInstr(MatchedMI));
EXPECT_TRUE(match);
EXPECT_TRUE(MIBUAddO.getInstr() == MatchedMI);
}
TEST_F(AArch64GISelMITest, MatchBinaryOp) {
setUp();
if (!TM)