lib/MC/MCSubtargetInfo.cpp

   1 //===-- MCSubtargetInfo.cpp - Subtarget 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 #include "llvm/MC/MCSubtargetInfo.h"
  11 #include "llvm/MC/MCInstrItineraries.h"
  12 #include "llvm/MC/SubtargetFeature.h"
  13 #include "llvm/ADT/StringRef.h"
  14 #include "llvm/ADT/Triple.h"
  15 #include "llvm/Support/raw_ostream.h"
  16 #include <algorithm>
  17
  18 using namespace llvm;
  19
  20 MCSchedModel MCSchedModel::DefaultSchedModel; // For unknown processors.
  21
  22 void
  23 MCSubtargetInfo::InitMCSubtargetInfo(StringRef TT, StringRef CPU, StringRef FS,
  24                                      const SubtargetFeatureKV *PF,
  25                                      const SubtargetFeatureKV *PD,
  26                                      const SubtargetInfoKV *ProcSched,
  27                                      const InstrStage *IS,
  28                                      const unsigned *OC,
  29                                      const unsigned *FP,
  30                                      unsigned NF, unsigned NP) {
  31   TargetTriple = TT;
  32   ProcFeatures = PF;
  33   ProcDesc = PD;
  34   ProcSchedModel = ProcSched;
  35   Stages = IS;
  36   OperandCycles = OC;
  37   ForwardingPaths = FP;
  38   NumFeatures = NF;
  39   NumProcs = NP;
  40
  41   SubtargetFeatures Features(FS);
  42   FeatureBits = Features.getFeatureBits(CPU, ProcDesc, NumProcs,
  43                                         ProcFeatures, NumFeatures);
  44 }
  45
  46
  47 /// ReInitMCSubtargetInfo - Change CPU (and optionally supplemented with
  48 /// feature string) and recompute feature bits.
  49 uint64_t MCSubtargetInfo::ReInitMCSubtargetInfo(StringRef CPU, StringRef FS) {
  50   SubtargetFeatures Features(FS);
  51   FeatureBits = Features.getFeatureBits(CPU, ProcDesc, NumProcs,
  52                                         ProcFeatures, NumFeatures);
  53   return FeatureBits;
  54 }
  55
  56 /// ToggleFeature - Toggle a feature and returns the re-computed feature
  57 /// bits. This version does not change the implied bits.
  58 uint64_t MCSubtargetInfo::ToggleFeature(uint64_t FB) {
  59   FeatureBits ^= FB;
  60   return FeatureBits;
  61 }
  62
  63 /// ToggleFeature - Toggle a feature and returns the re-computed feature
  64 /// bits. This version will also change all implied bits.
  65 uint64_t MCSubtargetInfo::ToggleFeature(StringRef FS) {
  66   SubtargetFeatures Features;
  67   FeatureBits = Features.ToggleFeature(FeatureBits, FS,
  68                                        ProcFeatures, NumFeatures);
  69   return FeatureBits;
  70 }
  71
  72
  73 MCSchedModel *
  74 MCSubtargetInfo::getSchedModelForCPU(StringRef CPU) const {
  75   assert(ProcSchedModel && "Processor machine model not available!");
  76
  77 #ifndef NDEBUG
  78   for (size_t i = 1; i < NumProcs; i++) {
  79     assert(strcmp(ProcSchedModel[i - 1].Key, ProcSchedModel[i].Key) < 0 &&
  80            "Processor machine model table is not sorted");
  81   }
  82 #endif
  83
  84   // Find entry
  85   SubtargetInfoKV KV;
  86   KV.Key = CPU.data();
  87   const SubtargetInfoKV *Found =
  88     std::lower_bound(ProcSchedModel, ProcSchedModel+NumProcs, KV);
  89   if (Found == ProcSchedModel+NumProcs || StringRef(Found->Key) != CPU) {
  90     errs() << "'" << CPU
  91            << "' is not a recognized processor for this target"
  92            << " (ignoring processor)\n";
  93     return &MCSchedModel::DefaultSchedModel;
  94   }
  95   assert(Found->Value && "Missing processor SchedModel value");
  96   return (MCSchedModel *)Found->Value;
  97 }
  98
  99 InstrItineraryData
 100 MCSubtargetInfo::getInstrItineraryForCPU(StringRef CPU) const {
 101   MCSchedModel *SchedModel = getSchedModelForCPU(CPU);
 102   return InstrItineraryData(SchedModel, Stages, OperandCycles, ForwardingPaths);
 103 }