lib/Target/AMDGPU/SIFrameLowering.cpp

   1 //===----------------------- SIFrameLowering.cpp --------------------------===//
   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 #include "SIFrameLowering.h"
  11 #include "SIRegisterInfo.h"
  12 #include "llvm/CodeGen/MachineFrameInfo.h"
  13 #include "llvm/CodeGen/MachineFunction.h"
  14 #include "llvm/CodeGen/RegisterScavenging.h"
  15
  16 using namespace llvm;
  17
  18 void SIFrameLowering::processFunctionBeforeFrameFinalized(
  19   MachineFunction &MF,
  20   RegScavenger *RS) const {
  21   MachineFrameInfo *MFI = MF.getFrameInfo();
  22   bool MayNeedScavengingEmergencySlot = MFI->hasStackObjects();
  23
  24   assert((RS || !MayNeedScavengingEmergencySlot) &&
  25          "RegScavenger required if spilling");
  26
  27   if (MayNeedScavengingEmergencySlot) {
  28     int ScavengeFI = MFI->CreateSpillStackObject(
  29       AMDGPU::SGPR_32RegClass.getSize(),
  30       AMDGPU::SGPR_32RegClass.getAlignment());
  31     RS->addScavengingFrameIndex(ScavengeFI);
  32   }
  33 }