lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp

//===-- AMDGPUInstPrinter.cpp - AMDGPU MC Inst -> ASM ---------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
// \file
//===----------------------------------------------------------------------===//

#include "AMDGPUInstPrinter.h"
#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCExpr.h"

using namespace llvm;

void AMDGPUInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
                             StringRef Annot) {
  printInstruction(MI, OS);

  printAnnotation(OS, Annot);
}

void AMDGPUInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
                                     raw_ostream &O) {

  const MCOperand &Op = MI->getOperand(OpNo);
  if (Op.isReg()) {
    switch (Op.getReg()) {
    // This is the default predicate state, so we don't need to print it.
    case AMDGPU::PRED_SEL_OFF: break;
    default: O << getRegisterName(Op.getReg()); break;
    }
  } else if (Op.isImm()) {
    O << Op.getImm();
  } else if (Op.isFPImm()) {
    O << Op.getFPImm();
  } else if (Op.isExpr()) {
    const MCExpr *Exp = Op.getExpr();
    Exp->print(O);
  } else {
    assert(!"unknown operand type in printOperand");
  }
}

void AMDGPUInstPrinter::printInterpSlot(const MCInst *MI, unsigned OpNum,
                                        raw_ostream &O) {
  unsigned Imm = MI->getOperand(OpNum).getImm();

  if (Imm == 2) {
    O << "P0";
  } else if (Imm == 1) {
    O << "P20";
  } else if (Imm == 0) {
    O << "P10";
  } else {
    assert(!"Invalid interpolation parameter slot");
  }
}

void AMDGPUInstPrinter::printMemOperand(const MCInst *MI, unsigned OpNo,
                                        raw_ostream &O) {
  printOperand(MI, OpNo, O);
  O  << ", ";
  printOperand(MI, OpNo + 1, O);
}

void AMDGPUInstPrinter::printIfSet(const MCInst *MI, unsigned OpNo,
                                    raw_ostream &O, StringRef Asm) {
  const MCOperand &Op = MI->getOperand(OpNo);
  assert(Op.isImm());
  if (Op.getImm() == 1) {
    O << Asm;
  }
}

void AMDGPUInstPrinter::printAbs(const MCInst *MI, unsigned OpNo,
                                 raw_ostream &O) {
  printIfSet(MI, OpNo, O, "|");
}

void AMDGPUInstPrinter::printClamp(const MCInst *MI, unsigned OpNo,
                                   raw_ostream &O) {
  printIfSet(MI, OpNo, O, "_SAT");
}

void AMDGPUInstPrinter::printLiteral(const MCInst *MI, unsigned OpNo,
                                     raw_ostream &O) {
  union Literal {
    float f;
    int32_t i;
  } L;

  L.i = MI->getOperand(OpNo).getImm();
  O << L.i << "(" << L.f << ")";
}

void AMDGPUInstPrinter::printLast(const MCInst *MI, unsigned OpNo,
                                  raw_ostream &O) {
  printIfSet(MI, OpNo, O, " *");
}

void AMDGPUInstPrinter::printNeg(const MCInst *MI, unsigned OpNo,
                                 raw_ostream &O) {
  printIfSet(MI, OpNo, O, "-");
}

void AMDGPUInstPrinter::printOMOD(const MCInst *MI, unsigned OpNo,
                                  raw_ostream &O) {
  switch (MI->getOperand(OpNo).getImm()) {
  default: break;
  case 1:
    O << " * 2.0";
    break;
  case 2:
    O << " * 4.0";
    break;
  case 3:
    O << " / 2.0";
    break;
  }
}

void AMDGPUInstPrinter::printRel(const MCInst *MI, unsigned OpNo,
                                 raw_ostream &O) {
  printIfSet(MI, OpNo, O, "+");
}

void AMDGPUInstPrinter::printUpdateExecMask(const MCInst *MI, unsigned OpNo,
                                            raw_ostream &O) {
  printIfSet(MI, OpNo, O, "ExecMask,");
}

void AMDGPUInstPrinter::printUpdatePred(const MCInst *MI, unsigned OpNo,
                                        raw_ostream &O) {
  printIfSet(MI, OpNo, O, "Pred,");
}

void AMDGPUInstPrinter::printWrite(const MCInst *MI, unsigned OpNo,
                                       raw_ostream &O) {
  const MCOperand &Op = MI->getOperand(OpNo);
  if (Op.getImm() == 0) {
    O << " (MASKED)";
  }
}

void AMDGPUInstPrinter::printSel(const MCInst *MI, unsigned OpNo,
                                  raw_ostream &O) {
  const char * chans = "XYZW";
  int sel = MI->getOperand(OpNo).getImm();

  int chan = sel & 3;
  sel >>= 2;

  if (sel >= 512) {
    sel -= 512;
    int cb = sel >> 12;
    sel &= 4095;
    O << cb << "[" << sel << "]";
  } else if (sel >= 448) {
    sel -= 448;
    O << sel;
  } else if (sel >= 0){
    O << sel;
  }

  if (sel >= 0)
    O << "." << chans[chan];
}

#include "AMDGPUGenAsmWriter.inc"