Evan Cheng | 9421470 | 2011-07-01 20:45:01 +0000 | [diff] [blame] | 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/Support/raw_ostream.h" |
| 15 | #include <algorithm> |
| 16 | |
| 17 | using namespace llvm; |
| 18 | |
Evan Cheng | 0ddff1b | 2011-07-07 07:07:08 +0000 | [diff] [blame] | 19 | void MCSubtargetInfo::InitMCSubtargetInfo(StringRef CPU, StringRef FS, |
| 20 | const SubtargetFeatureKV *PF, |
| 21 | const SubtargetFeatureKV *PD, |
| 22 | const SubtargetInfoKV *PI, |
| 23 | const InstrStage *IS, |
| 24 | const unsigned *OC, |
| 25 | const unsigned *FP, |
| 26 | unsigned NF, unsigned NP) { |
| 27 | ProcFeatures = PF; |
| 28 | ProcDesc = PD; |
| 29 | ProcItins = PI; |
| 30 | Stages = IS; |
| 31 | OperandCycles = OC; |
| 32 | ForwardingPathes = FP; |
| 33 | NumFeatures = NF; |
| 34 | NumProcs = NP; |
| 35 | |
| 36 | SubtargetFeatures Features(FS); |
| 37 | FeatureBits = Features.getFeatureBits(CPU, ProcDesc, NumProcs, |
| 38 | ProcFeatures, NumFeatures); |
| 39 | } |
| 40 | |
| 41 | |
| 42 | /// ReInitMCSubtargetInfo - Change CPU (and optionally supplemented with |
| 43 | /// feature string) and recompute feature bits. |
| 44 | uint64_t MCSubtargetInfo::ReInitMCSubtargetInfo(StringRef CPU, StringRef FS) { |
| 45 | SubtargetFeatures Features(FS); |
| 46 | FeatureBits = Features.getFeatureBits(CPU, ProcDesc, NumProcs, |
| 47 | ProcFeatures, NumFeatures); |
| 48 | return FeatureBits; |
| 49 | } |
| 50 | |
Evan Cheng | ffc0e73 | 2011-07-09 05:47:46 +0000 | [diff] [blame^] | 51 | /// ToggleFeature - Toggle a feature and returns the re-computed feature |
| 52 | /// bits. This version does not change the implied bits. |
| 53 | uint64_t MCSubtargetInfo::ToggleFeature(uint64_t FB) { |
| 54 | FeatureBits ^= FB; |
| 55 | return FeatureBits; |
| 56 | } |
| 57 | |
| 58 | /// ToggleFeature - Toggle a feature and returns the re-computed feature |
| 59 | /// bits. This version will also change all implied bits. |
| 60 | uint64_t MCSubtargetInfo::ToggleFeature(StringRef FS) { |
| 61 | SubtargetFeatures Features; |
| 62 | FeatureBits = Features.ToggleFeature(FeatureBits, FS, |
| 63 | ProcFeatures, NumFeatures); |
| 64 | return FeatureBits; |
| 65 | } |
| 66 | |
| 67 | |
Evan Cheng | 9421470 | 2011-07-01 20:45:01 +0000 | [diff] [blame] | 68 | InstrItineraryData |
| 69 | MCSubtargetInfo::getInstrItineraryForCPU(StringRef CPU) const { |
| 70 | assert(ProcItins && "Instruction itineraries information not available!"); |
| 71 | |
| 72 | #ifndef NDEBUG |
| 73 | for (size_t i = 1; i < NumProcs; i++) { |
| 74 | assert(strcmp(ProcItins[i - 1].Key, ProcItins[i].Key) < 0 && |
| 75 | "Itineraries table is not sorted"); |
| 76 | } |
| 77 | #endif |
| 78 | |
| 79 | // Find entry |
| 80 | SubtargetInfoKV KV; |
| 81 | KV.Key = CPU.data(); |
| 82 | const SubtargetInfoKV *Found = |
| 83 | std::lower_bound(ProcItins, ProcItins+NumProcs, KV); |
| 84 | if (Found == ProcItins+NumProcs || StringRef(Found->Key) != CPU) { |
| 85 | errs() << "'" << CPU |
| 86 | << "' is not a recognized processor for this target" |
| 87 | << " (ignoring processor)\n"; |
| 88 | return InstrItineraryData(); |
| 89 | } |
| 90 | |
| 91 | return InstrItineraryData(Stages, OperandCycles, ForwardingPathes, |
| 92 | (InstrItinerary *)Found->Value); |
| 93 | } |