lib/Target/PTX/PTXRegisterInfo.cpp

   1 //===- PTXRegisterInfo.cpp - PTX Register Information ---------------------===//
   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 PTX implementation of the TargetRegisterInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "PTX.h"
  15 #include "PTXRegisterInfo.h"
  16 #include "llvm/CodeGen/MachineFunction.h"
  17 #include "llvm/Support/Debug.h"
  18 #include "llvm/Support/raw_ostream.h"
  19
  20 #define GET_REGINFO_MC_DESC
  21 #define GET_REGINFO_TARGET_DESC
  22 #include "PTXGenRegisterInfo.inc"
  23
  24 using namespace llvm;
  25
  26 PTXRegisterInfo::PTXRegisterInfo(PTXTargetMachine &TM,
  27                                  const TargetInstrInfo &TII)
  28   : PTXGenRegisterInfo() {
  29 }
  30
  31 void PTXRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
  32                                           int SPAdj,
  33                                           RegScavenger *RS) const {
  34   unsigned Index;
  35   MachineInstr& MI = *II;
  36
  37   Index = 0;
  38   while (!MI.getOperand(Index).isFI()) {
  39     ++Index;
  40     assert(Index < MI.getNumOperands() &&
  41            "Instr does not have a FrameIndex operand!");
  42   }
  43
  44   int FrameIndex = MI.getOperand(Index).getIndex();
  45
  46   DEBUG(dbgs() << "eliminateFrameIndex: " << MI);
  47   DEBUG(dbgs() << "- SPAdj: " << SPAdj << "\n");
  48   DEBUG(dbgs() << "- FrameIndex: " << FrameIndex << "\n");
  49
  50   // This frame index is post stack slot re-use assignments
  51   MI.getOperand(Index).ChangeToImmediate(FrameIndex);
  52 }