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//=- SPIRVMCInstLower.cpp - Convert SPIR-V MachineInstr to MCInst -*- 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
//
//===----------------------------------------------------------------------===//
//
// This file contains code to lower SPIR-V MachineInstrs to their corresponding
// MCInst records.
//
//===----------------------------------------------------------------------===//
#include "SPIRVMCInstLower.h"
#include "SPIRVModuleAnalysis.h"
#include "SPIRVUtils.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/IR/Constants.h"
using namespace llvm;
void SPIRVMCInstLower::lower(const MachineInstr *MI, MCInst &OutMI,
SPIRV::ModuleAnalysisInfo *MAI) const {
OutMI.setOpcode(MI->getOpcode());
// Propagate previously set flags
if (MI->getAsmPrinterFlags() & SPIRV::ASM_PRINTER_WIDTH16)
OutMI.setFlags(SPIRV::INST_PRINTER_WIDTH16);
const MachineFunction *MF = MI->getMF();
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
MCOperand MCOp;
switch (MO.getType()) {
default:
llvm_unreachable("unknown operand type");
case MachineOperand::MO_GlobalAddress: {
MCRegister FuncReg = MAI->getFuncReg(dyn_cast<Function>(MO.getGlobal()));
if (!FuncReg.isValid()) {
std::string DiagMsg;
raw_string_ostream OS(DiagMsg);
MI->print(OS);
DiagMsg = "Unknown function in:" + DiagMsg;
report_fatal_error(DiagMsg.c_str());
}
MCOp = MCOperand::createReg(FuncReg);
break;
}
case MachineOperand::MO_MachineBasicBlock:
MCOp = MCOperand::createReg(MAI->getOrCreateMBBRegister(*MO.getMBB()));
break;
case MachineOperand::MO_Register: {
MCRegister NewReg = MAI->getRegisterAlias(MF, MO.getReg());
MCOp = MCOperand::createReg(NewReg.isValid() ? NewReg
: MO.getReg().asMCReg());
break;
}
case MachineOperand::MO_Immediate:
if (MI->getOpcode() == SPIRV::OpExtInst && i == 2) {
MCRegister Reg = MAI->getExtInstSetReg(MO.getImm());
MCOp = MCOperand::createReg(Reg);
} else {
MCOp = MCOperand::createImm(MO.getImm());
}
break;
case MachineOperand::MO_FPImmediate:
MCOp = MCOperand::createDFPImm(
MO.getFPImm()->getValueAPF().convertToFloat());
break;
}
OutMI.addOperand(MCOp);
}
}
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