1fe7d9c799
Makes `InstructionSelector.h`/`InstructionSelectorImpl.h` generic so the match tables can also be used for the combiner. Some notes: - Coverage was made an optional parameter of `executeMatchTable`, combines won't use it for now. - `GIPFP_` -> `GICXXPred_` so it's more generic. Those are just C++ predicates and aren't PatFrag-specific. - Pass the MatcherState directly to testMIPredicate_MI, the combiner will need it. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D153755
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
//===- llvm/CodeGen/GlobalISel/GIMatchTableExecutor.cpp -------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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/// This file implements the GIMatchTableExecutor class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/GlobalISel/GIMatchTableExecutor.h"
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#include "llvm/CodeGen/GlobalISel/Utils.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineOperand.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#define DEBUG_TYPE "gi-match-table-executor"
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using namespace llvm;
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GIMatchTableExecutor::MatcherState::MatcherState(unsigned MaxRenderers)
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: Renderers(MaxRenderers) {}
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GIMatchTableExecutor::GIMatchTableExecutor() = default;
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bool GIMatchTableExecutor::isOperandImmEqual(
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const MachineOperand &MO, int64_t Value,
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const MachineRegisterInfo &MRI) const {
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if (MO.isReg() && MO.getReg())
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if (auto VRegVal = getIConstantVRegValWithLookThrough(MO.getReg(), MRI))
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return VRegVal->Value.getSExtValue() == Value;
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return false;
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}
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bool GIMatchTableExecutor::isBaseWithConstantOffset(
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const MachineOperand &Root, const MachineRegisterInfo &MRI) const {
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if (!Root.isReg())
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return false;
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MachineInstr *RootI = MRI.getVRegDef(Root.getReg());
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if (RootI->getOpcode() != TargetOpcode::G_PTR_ADD)
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return false;
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MachineOperand &RHS = RootI->getOperand(2);
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MachineInstr *RHSI = MRI.getVRegDef(RHS.getReg());
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if (RHSI->getOpcode() != TargetOpcode::G_CONSTANT)
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return false;
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return true;
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}
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bool GIMatchTableExecutor::isObviouslySafeToFold(MachineInstr &MI,
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MachineInstr &IntoMI) const {
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// Immediate neighbours are already folded.
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if (MI.getParent() == IntoMI.getParent() &&
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std::next(MI.getIterator()) == IntoMI.getIterator())
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return true;
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// Convergent instructions cannot be moved in the CFG.
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if (MI.isConvergent() && MI.getParent() != IntoMI.getParent())
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return false;
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return !MI.mayLoadOrStore() && !MI.mayRaiseFPException() &&
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!MI.hasUnmodeledSideEffects() && MI.implicit_operands().empty();
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}
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