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//===- AMDGPUGlobalISelUtils.cpp ---------------------------------*- C++ -*-==//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "AMDGPUGlobalISelUtils.h"
#include "llvm/CodeGen/GlobalISel/MIPatternMatch.h"
#include "llvm/IR/Constants.h"
using namespace llvm;
using namespace MIPatternMatch;
std::tuple<Register, unsigned, MachineInstr *>
AMDGPU::getBaseWithConstantOffset(MachineRegisterInfo &MRI, Register Reg) {
MachineInstr *Def = getDefIgnoringCopies(Reg, MRI);
if (!Def)
return std::make_tuple(Reg, 0, nullptr);
if (Def->getOpcode() == TargetOpcode::G_CONSTANT) {
unsigned Offset;
const MachineOperand &Op = Def->getOperand(1);
if (Op.isImm())
Offset = Op.getImm();
else
Offset = Op.getCImm()->getZExtValue();
return std::make_tuple(Register(), Offset, Def);
}
int64_t Offset;
if (Def->getOpcode() == TargetOpcode::G_ADD) {
// TODO: Handle G_OR used for add case
if (mi_match(Def->getOperand(2).getReg(), MRI, m_ICst(Offset)))
return std::make_tuple(Def->getOperand(1).getReg(), Offset, Def);
// FIXME: matcher should ignore copies
if (mi_match(Def->getOperand(2).getReg(), MRI, m_Copy(m_ICst(Offset))))
return std::make_tuple(Def->getOperand(1).getReg(), Offset, Def);
}
return std::make_tuple(Reg, 0, Def);
}
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