MBlazeSubtarget.cpp revision ffc0e73046f737d75e0a62b3a83ef19bcef111e3 
1//===- MBlazeSubtarget.cpp - MBlaze Subtarget Information -------*- C++ -*-===//
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 implements the MBlaze specific subclass of TargetSubtargetInfo.
11//
12//===----------------------------------------------------------------------===//
13
14#include "MBlazeSubtarget.h"
15#include "MBlaze.h"
16#include "MBlazeRegisterInfo.h"
17#include "llvm/Support/CommandLine.h"
18#include "llvm/Target/TargetRegistry.h"
19
20#define GET_SUBTARGETINFO_ENUM
21#define GET_SUBTARGETINFO_MC_DESC
22#define GET_SUBTARGETINFO_TARGET_DESC
23#define GET_SUBTARGETINFO_CTOR
24#include "MBlazeGenSubtargetInfo.inc"
25
26using namespace llvm;
27
28MBlazeSubtarget::MBlazeSubtarget(const std::string &TT,
29                                 const std::string &CPU,
30                                 const std::string &FS):
31  MBlazeGenSubtargetInfo(TT, CPU, FS),
32  HasBarrel(false), HasDiv(false), HasMul(false), HasPatCmp(false),
33  HasFPU(false), HasMul64(false), HasSqrt(false)
34{
35  // Parse features string.
36  std::string CPUName = CPU;
37  if (CPUName.empty())
38    CPUName = "mblaze";
39  ParseSubtargetFeatures(CPUName, FS);
40
41  // Only use instruction scheduling if the selected CPU has an instruction
42  // itinerary (the default CPU is the only one that doesn't).
43  HasItin = CPUName != "mblaze";
44  DEBUG(dbgs() << "CPU " << CPUName << "(" << HasItin << ")\n");
45
46  // Initialize scheduling itinerary for the specified CPU.
47  InstrItins = getInstrItineraryForCPU(CPUName);
48
49  // Compute the issue width of the MBlaze itineraries
50  computeIssueWidth();
51}
52
53void MBlazeSubtarget::computeIssueWidth() {
54  InstrItins.IssueWidth = 1;
55}
56
57bool MBlazeSubtarget::
58enablePostRAScheduler(CodeGenOpt::Level OptLevel,
59                      TargetSubtargetInfo::AntiDepBreakMode& Mode,
60                      RegClassVector& CriticalPathRCs) const {
61  Mode = TargetSubtargetInfo::ANTIDEP_CRITICAL;
62  CriticalPathRCs.clear();
63  CriticalPathRCs.push_back(&MBlaze::GPRRegClass);
64  return HasItin && OptLevel >= CodeGenOpt::Default;
65}
66
67MCSubtargetInfo *createMBlazeMCSubtargetInfo(StringRef TT, StringRef CPU,
68                                            StringRef FS) {
69  MCSubtargetInfo *X = new MCSubtargetInfo();
70  InitMBlazeMCSubtargetInfo(X, CPU, FS);
71  return X;
72}
73
74extern "C" void LLVMInitializeMBlazeMCSubtargetInfo() {
75  TargetRegistry::RegisterMCSubtargetInfo(TheMBlazeTarget,
76                                          createMBlazeMCSubtargetInfo);
77}
78