| 1 | //===- llvm/CodeGen/GlobalISel/GIMatchTableExecutor.cpp -------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | /// \file |
| 10 | /// This file implements the GIMatchTableExecutor class. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "llvm/CodeGen/GlobalISel/GIMatchTableExecutor.h" |
| 15 | #include "llvm/CodeGen/GlobalISel/Utils.h" |
| 16 | #include "llvm/CodeGen/MachineInstr.h" |
| 17 | #include "llvm/CodeGen/MachineOperand.h" |
| 18 | #include "llvm/CodeGen/MachineRegisterInfo.h" |
| 19 | |
| 20 | #define DEBUG_TYPE "gi-match-table-executor" |
| 21 | |
| 22 | using namespace llvm; |
| 23 | |
| 24 | GIMatchTableExecutor::MatcherState::MatcherState(unsigned MaxRenderers) |
| 25 | : Renderers(MaxRenderers) {} |
| 26 | |
| 27 | GIMatchTableExecutor::GIMatchTableExecutor() = default; |
| 28 | |
| 29 | bool GIMatchTableExecutor::isOperandImmEqual(const MachineOperand &MO, |
| 30 | int64_t Value, |
| 31 | const MachineRegisterInfo &MRI, |
| 32 | bool Splat) const { |
| 33 | if (MO.isReg() && MO.getReg()) { |
| 34 | if (auto VRegVal = getIConstantVRegValWithLookThrough(VReg: MO.getReg(), MRI)) |
| 35 | return VRegVal->Value.getSExtValue() == Value; |
| 36 | |
| 37 | if (Splat) { |
| 38 | if (auto VRegVal = getIConstantSplatVal(Reg: MO.getReg(), MRI)) |
| 39 | return VRegVal->getSExtValue() == Value; |
| 40 | } |
| 41 | } |
| 42 | return false; |
| 43 | } |
| 44 | |
| 45 | bool GIMatchTableExecutor::isBaseWithConstantOffset( |
| 46 | const MachineOperand &Root, const MachineRegisterInfo &MRI) const { |
| 47 | if (!Root.isReg()) |
| 48 | return false; |
| 49 | |
| 50 | MachineInstr *RootI = MRI.getVRegDef(Reg: Root.getReg()); |
| 51 | if (RootI->getOpcode() != TargetOpcode::G_PTR_ADD) |
| 52 | return false; |
| 53 | |
| 54 | MachineOperand &RHS = RootI->getOperand(i: 2); |
| 55 | MachineInstr *RHSI = MRI.getVRegDef(Reg: RHS.getReg()); |
| 56 | if (RHSI->getOpcode() != TargetOpcode::G_CONSTANT) |
| 57 | return false; |
| 58 | |
| 59 | return true; |
| 60 | } |
| 61 | |
| 62 | bool GIMatchTableExecutor::isObviouslySafeToFold(MachineInstr &MI, |
| 63 | MachineInstr &IntoMI) const { |
| 64 | // Immediate neighbours are already folded. |
| 65 | if (MI.getParent() == IntoMI.getParent() && |
| 66 | std::next(x: MI.getIterator()) == IntoMI.getIterator()) |
| 67 | return true; |
| 68 | |
| 69 | // Convergent instructions cannot be moved in the CFG. |
| 70 | if (MI.isConvergent() && MI.getParent() != IntoMI.getParent()) |
| 71 | return false; |
| 72 | |
| 73 | return !MI.mayLoadOrStore() && !MI.mayRaiseFPException() && |
| 74 | !MI.hasUnmodeledSideEffects() && MI.implicit_operands().empty(); |
| 75 | } |
| 76 |