src/gallium/drivers/radeon/AMDGPUInstrInfo.cpp

   1 //===-- AMDGPUInstrInfo.cpp - Base class for AMD GPU InstrInfo ------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains the implementation of the TargetInstrInfo class that is
  11 // common to all AMD GPUs.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "AMDGPUInstrInfo.h"
  16 #include "AMDGPURegisterInfo.h"
  17 #include "AMDGPUTargetMachine.h"
  18 #include "AMDIL.h"
  19 #include "llvm/CodeGen/MachineRegisterInfo.h"
  20
  21 using namespace llvm;
  22
  23 AMDGPUInstrInfo::AMDGPUInstrInfo(AMDGPUTargetMachine &tm)
  24   : AMDILInstrInfo(tm), TM(tm) { }
  25
  26 MachineInstr * AMDGPUInstrInfo::convertToISA(MachineInstr & MI, MachineFunction &MF,
  27     DebugLoc DL) const
  28 {
  29   MachineInstrBuilder newInstr;
  30   MachineRegisterInfo &MRI = MF.getRegInfo();
  31   const AMDGPURegisterInfo & RI = getRegisterInfo();
  32
  33   // Create the new instruction
  34   newInstr = BuildMI(MF, DL, TM.getInstrInfo()->get(MI.getOpcode()));
  35
  36   for (unsigned i = 0; i < MI.getNumOperands(); i++) {
  37     MachineOperand &MO = MI.getOperand(i);
  38     // Convert dst regclass to one that is supported by the ISA
  39     if (MO.isReg() && MO.isDef()) {
  40       if (TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
  41         const TargetRegisterClass * oldRegClass = MRI.getRegClass(MO.getReg());
  42         const TargetRegisterClass * newRegClass = RI.getISARegClass(oldRegClass);
  43
  44         assert(newRegClass);
  45
  46         MRI.setRegClass(MO.getReg(), newRegClass);
  47       }
  48     }
  49     // Add the operand to the new instruction
  50     newInstr.addOperand(MO);
  51   }
  52
  53   return newInstr;
  54 }