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//===- AMDGPUMCInstLower.cpp - Lower AMDGPU MachineInstr to an MCInst -----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file
/// \brief Code to lower AMDGPU MachineInstrs to their corresponding MCInst.
//
//===----------------------------------------------------------------------===//
//
#include "AMDGPUMCInstLower.h"
#include "AMDGPUAsmPrinter.h"
#include "R600InstrInfo.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Constants.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
AMDGPUMCInstLower::AMDGPUMCInstLower(MCContext &ctx):
Ctx(ctx)
{ }
void AMDGPUMCInstLower::lower(const MachineInstr *MI, MCInst &OutMI) const {
OutMI.setOpcode(MI->getOpcode());
for (unsigned i = 0, e = MI->getNumExplicitOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
MCOperand MCOp;
switch (MO.getType()) {
default:
llvm_unreachable("unknown operand type");
case MachineOperand::MO_FPImmediate: {
const APFloat &FloatValue = MO.getFPImm()->getValueAPF();
assert(&FloatValue.getSemantics() == &APFloat::IEEEsingle &&
"Only floating point immediates are supported at the moment.");
MCOp = MCOperand::CreateFPImm(FloatValue.convertToFloat());
break;
}
case MachineOperand::MO_Immediate:
MCOp = MCOperand::CreateImm(MO.getImm());
break;
case MachineOperand::MO_Register:
MCOp = MCOperand::CreateReg(MO.getReg());
break;
case MachineOperand::MO_MachineBasicBlock:
MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
MO.getMBB()->getSymbol(), Ctx));
}
OutMI.addOperand(MCOp);
}
}
void AMDGPUAsmPrinter::EmitInstruction(const MachineInstr *MI) {
AMDGPUMCInstLower MCInstLowering(OutContext);
if (MI->isBundle()) {
const MachineBasicBlock *MBB = MI->getParent();
MachineBasicBlock::const_instr_iterator I = MI;
++I;
while (I != MBB->end() && I->isInsideBundle()) {
MCInst MCBundleInst;
const MachineInstr *BundledInst = I;
MCInstLowering.lower(BundledInst, MCBundleInst);
OutStreamer.EmitInstruction(MCBundleInst);
++I;
}
} else {
MCInst TmpInst;
MCInstLowering.lower(MI, TmpInst);
OutStreamer.EmitInstruction(TmpInst);
}
}
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