| //===-- SIFixVGPRCopies.cpp - Fix VGPR Copies after regalloc --------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| /// \file |
| /// Add implicit use of exec to vector register copies. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "AMDGPU.h" |
| #include "GCNSubtarget.h" |
| #include "MCTargetDesc/AMDGPUMCTargetDesc.h" |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| |
| using namespace llvm; |
| |
| #define DEBUG_TYPE "si-fix-vgpr-copies" |
| |
| namespace { |
| |
| class SIFixVGPRCopies : public MachineFunctionPass { |
| public: |
| static char ID; |
| |
| public: |
| SIFixVGPRCopies() : MachineFunctionPass(ID) { |
| initializeSIFixVGPRCopiesPass(*PassRegistry::getPassRegistry()); |
| } |
| |
| bool runOnMachineFunction(MachineFunction &MF) override; |
| |
| StringRef getPassName() const override { return "SI Fix VGPR copies"; } |
| }; |
| |
| } // End anonymous namespace. |
| |
| INITIALIZE_PASS(SIFixVGPRCopies, DEBUG_TYPE, "SI Fix VGPR copies", false, false) |
| |
| char SIFixVGPRCopies::ID = 0; |
| |
| char &llvm::SIFixVGPRCopiesID = SIFixVGPRCopies::ID; |
| |
| bool SIFixVGPRCopies::runOnMachineFunction(MachineFunction &MF) { |
| const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>(); |
| const SIRegisterInfo *TRI = ST.getRegisterInfo(); |
| const SIInstrInfo *TII = ST.getInstrInfo(); |
| bool Changed = false; |
| |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| switch (MI.getOpcode()) { |
| case AMDGPU::COPY: |
| if (TII->isVGPRCopy(MI) && !MI.readsRegister(AMDGPU::EXEC, TRI)) { |
| MI.addOperand(MF, |
| MachineOperand::CreateReg(AMDGPU::EXEC, false, true)); |
| LLVM_DEBUG(dbgs() << "Add exec use to " << MI); |
| Changed = true; |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| |
| return Changed; |
| } |