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/Support/TargetRegistry.h"
19
20#define GET_SUBTARGETINFO_TARGET_DESC
21#define GET_SUBTARGETINFO_CTOR
22#include "MBlazeGenSubtargetInfo.inc"
23
24using namespace llvm;
25
26MBlazeSubtarget::MBlazeSubtarget(const std::string &TT,
27                                 const std::string &CPU,
28                                 const std::string &FS):
29  MBlazeGenSubtargetInfo(TT, CPU, FS),
30  HasBarrel(false), HasDiv(false), HasMul(false), HasPatCmp(false),
31  HasFPU(false), HasMul64(false), HasSqrt(false)
32{
33  // Parse features string.
34  std::string CPUName = CPU;
35  if (CPUName.empty())
36    CPUName = "mblaze";
37  ParseSubtargetFeatures(CPUName, FS);
38
39  // Only use instruction scheduling if the selected CPU has an instruction
40  // itinerary (the default CPU is the only one that doesn't).
41  HasItin = CPUName != "mblaze";
42  DEBUG(dbgs() << "CPU " << CPUName << "(" << HasItin << ")\n");
43
44  // Initialize scheduling itinerary for the specified CPU.
45  InstrItins = getInstrItineraryForCPU(CPUName);
46
47  // Compute the issue width of the MBlaze itineraries
48  computeIssueWidth();
49}
50
51void MBlazeSubtarget::computeIssueWidth() {
52  InstrItins.IssueWidth = 1;
53}
54
55bool MBlazeSubtarget::
56enablePostRAScheduler(CodeGenOpt::Level OptLevel,
57                      TargetSubtargetInfo::AntiDepBreakMode& Mode,
58                      RegClassVector& CriticalPathRCs) const {
59  Mode = TargetSubtargetInfo::ANTIDEP_CRITICAL;
60  CriticalPathRCs.clear();
61  CriticalPathRCs.push_back(&MBlaze::GPRRegClass);
62  return HasItin && OptLevel >= CodeGenOpt::Default;
63}
64