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//===-- AMDGPUReserveWWMRegs.cpp - Add WWM Regs to reserved regs list -----===//
//
// 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
/// This pass should be invoked at the end of wwm-regalloc pipeline.
/// It identifies the WWM regs allocated during this pipeline and add
/// them to the list of reserved registers so that they won't be available for
/// per-thread VGPR allocation in the subsequent regalloc pipeline.
//
//===----------------------------------------------------------------------===//
#include "AMDGPUReserveWWMRegs.h"
#include "AMDGPU.h"
#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
#include "SIMachineFunctionInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/VirtRegMap.h"
using namespace llvm;
#define DEBUG_TYPE "amdgpu-reserve-wwm-regs"
namespace {
class AMDGPUReserveWWMRegsLegacy : public MachineFunctionPass {
public:
static char ID;
AMDGPUReserveWWMRegsLegacy() : MachineFunctionPass(ID) {}
bool runOnMachineFunction(MachineFunction &MF) override;
StringRef getPassName() const override {
return "AMDGPU Reserve WWM Registers";
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
MachineFunctionPass::getAnalysisUsage(AU);
}
};
class AMDGPUReserveWWMRegs {
public:
bool run(MachineFunction &MF);
};
} // End anonymous namespace.
INITIALIZE_PASS(AMDGPUReserveWWMRegsLegacy, DEBUG_TYPE,
"AMDGPU Reserve WWM Registers", false, false)
char AMDGPUReserveWWMRegsLegacy::ID = 0;
char &llvm::AMDGPUReserveWWMRegsLegacyID = AMDGPUReserveWWMRegsLegacy::ID;
bool AMDGPUReserveWWMRegsLegacy::runOnMachineFunction(MachineFunction &MF) {
return AMDGPUReserveWWMRegs().run(MF);
}
PreservedAnalyses
AMDGPUReserveWWMRegsPass::run(MachineFunction &MF,
MachineFunctionAnalysisManager &) {
AMDGPUReserveWWMRegs().run(MF);
// TODO: This should abandon RegisterClassInfo once it is turned into an
// analysis.
return PreservedAnalyses::all();
}
bool AMDGPUReserveWWMRegs::run(MachineFunction &MF) {
SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
bool Changed = false;
for (MachineBasicBlock &MBB : MF) {
for (MachineInstr &MI : MBB) {
unsigned Opc = MI.getOpcode();
if (Opc != AMDGPU::SI_SPILL_S32_TO_VGPR &&
Opc != AMDGPU::SI_RESTORE_S32_FROM_VGPR)
continue;
Register Reg = Opc == AMDGPU::SI_SPILL_S32_TO_VGPR
? MI.getOperand(0).getReg()
: MI.getOperand(1).getReg();
assert(Reg.isPhysical() &&
"All WWM registers should have been allocated by now.");
MFI->reserveWWMRegister(Reg);
Changed |= true;
}
}
// The renamable flag can't be set for reserved registers. Reset the flag for
// MOs involving wwm-regs as they will be reserved during vgpr-regalloc
// pipeline.
const MachineRegisterInfo &MRI = MF.getRegInfo();
for (Register Reg : MFI->getWWMReservedRegs()) {
for (MachineOperand &MO : MRI.reg_operands(Reg))
MO.setIsRenamable(false);
}
// Now clear the NonWWMRegMask earlier set during wwm-regalloc.
MFI->clearNonWWMRegAllocMask();
return Changed;
}
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