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 void
  21 MCSubtargetInfo::InitMCSubtargetInfo(StringRef TT, StringRef CPU, StringRef FS,
  22                                      const SubtargetFeatureKV *PF,
  23                                      const SubtargetFeatureKV *PD,
  24                                      const SubtargetInfoKV *PI,
  25                                      const InstrStage *IS,
  26                                      const unsigned *OC,
  27                                      const unsigned *FP,
  28                                      unsigned NF, unsigned NP) {
  29   TargetTriple = TT;
  30   ProcFeatures = PF;
  31   ProcDesc = PD;
  32   ProcItins = PI;
  33   Stages = IS;
  34   OperandCycles = OC;
  35   ForwardingPaths = FP;
  36   NumFeatures = NF;
  37   NumProcs = NP;
  38
  39   SubtargetFeatures Features(FS);
  40   FeatureBits = Features.getFeatureBits(CPU, ProcDesc, NumProcs,
  41                                         ProcFeatures, NumFeatures);
  42 }
  43
  44
  45 /// ReInitMCSubtargetInfo - Change CPU (and optionally supplemented with
  46 /// feature string) and recompute feature bits.
  47 uint64_t MCSubtargetInfo::ReInitMCSubtargetInfo(StringRef CPU, StringRef FS) {
  48   SubtargetFeatures Features(FS);
  49   FeatureBits = Features.getFeatureBits(CPU, ProcDesc, NumProcs,
  50                                         ProcFeatures, NumFeatures);
  51   return FeatureBits;
  52 }
  53
  54 /// ToggleFeature - Toggle a feature and returns the re-computed feature
  55 /// bits. This version does not change the implied bits.
  56 uint64_t MCSubtargetInfo::ToggleFeature(uint64_t FB) {
  57   FeatureBits ^= FB;
  58   return FeatureBits;
  59 }
  60
  61 /// ToggleFeature - Toggle a feature and returns the re-computed feature
  62 /// bits. This version will also change all implied bits.
  63 uint64_t MCSubtargetInfo::ToggleFeature(StringRef FS) {
  64   SubtargetFeatures Features;
  65   FeatureBits = Features.ToggleFeature(FeatureBits, FS,
  66                                        ProcFeatures, NumFeatures);
  67   return FeatureBits;
  68 }
  69
  70
  71 InstrItineraryData
  72 MCSubtargetInfo::getInstrItineraryForCPU(StringRef CPU) const {
  73   assert(ProcItins && "Instruction itineraries information not available!");
  74
  75 #ifndef NDEBUG
  76   for (size_t i = 1; i < NumProcs; i++) {
  77     assert(strcmp(ProcItins[i - 1].Key, ProcItins[i].Key) < 0 &&
  78            "Itineraries table is not sorted");
  79   }
  80 #endif
  81
  82   // Find entry
  83   SubtargetInfoKV KV;
  84   KV.Key = CPU.data();
  85   const SubtargetInfoKV *Found =
  86     std::lower_bound(ProcItins, ProcItins+NumProcs, KV);
  87   if (Found == ProcItins+NumProcs || StringRef(Found->Key) != CPU) {
  88     errs() << "'" << CPU
  89            << "' is not a recognized processor for this target"
  90            << " (ignoring processor)\n";
  91     return InstrItineraryData();
  92   }
  93
  94   InstrItinerarySubtargetValue *V =
  95     (InstrItinerarySubtargetValue *)Found->Value;
  96   return InstrItineraryData(V->Props, Stages, OperandCycles, ForwardingPaths,
  97                             V->Itineraries);
  98 }