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/ADT/StringRef.h"
12 #include "llvm/ADT/Triple.h"
13 #include "llvm/MC/MCInstrItineraries.h"
14 #include "llvm/MC/SubtargetFeature.h"
15 #include "llvm/Support/raw_ostream.h"
16 #include <algorithm>
17
18 using namespace llvm;
19
getFeatures(StringRef CPU,StringRef FS,ArrayRef<SubtargetFeatureKV> ProcDesc,ArrayRef<SubtargetFeatureKV> ProcFeatures)20 static FeatureBitset getFeatures(StringRef CPU, StringRef FS,
21 ArrayRef<SubtargetFeatureKV> ProcDesc,
22 ArrayRef<SubtargetFeatureKV> ProcFeatures) {
23 SubtargetFeatures Features(FS);
24 return Features.getFeatureBits(CPU, ProcDesc, ProcFeatures);
25 }
26
InitMCProcessorInfo(StringRef CPU,StringRef FS)27 void MCSubtargetInfo::InitMCProcessorInfo(StringRef CPU, StringRef FS) {
28 FeatureBits = getFeatures(CPU, FS, ProcDesc, ProcFeatures);
29 if (!CPU.empty())
30 CPUSchedModel = &getSchedModelForCPU(CPU);
31 else
32 CPUSchedModel = &MCSchedModel::GetDefaultSchedModel();
33 }
34
setDefaultFeatures(StringRef CPU,StringRef FS)35 void MCSubtargetInfo::setDefaultFeatures(StringRef CPU, StringRef FS) {
36 FeatureBits = getFeatures(CPU, FS, ProcDesc, ProcFeatures);
37 }
38
MCSubtargetInfo(const Triple & TT,StringRef C,StringRef FS,ArrayRef<SubtargetFeatureKV> PF,ArrayRef<SubtargetFeatureKV> PD,const SubtargetInfoKV * ProcSched,const MCWriteProcResEntry * WPR,const MCWriteLatencyEntry * WL,const MCReadAdvanceEntry * RA,const InstrStage * IS,const unsigned * OC,const unsigned * FP)39 MCSubtargetInfo::MCSubtargetInfo(
40 const Triple &TT, StringRef C, StringRef FS,
41 ArrayRef<SubtargetFeatureKV> PF, ArrayRef<SubtargetFeatureKV> PD,
42 const SubtargetInfoKV *ProcSched, const MCWriteProcResEntry *WPR,
43 const MCWriteLatencyEntry *WL, const MCReadAdvanceEntry *RA,
44 const InstrStage *IS, const unsigned *OC, const unsigned *FP)
45 : TargetTriple(TT), CPU(C), ProcFeatures(PF), ProcDesc(PD),
46 ProcSchedModels(ProcSched), WriteProcResTable(WPR), WriteLatencyTable(WL),
47 ReadAdvanceTable(RA), Stages(IS), OperandCycles(OC), ForwardingPaths(FP) {
48 InitMCProcessorInfo(CPU, FS);
49 }
50
51 /// ToggleFeature - Toggle a feature and returns the re-computed feature
52 /// bits. This version does not change the implied bits.
ToggleFeature(uint64_t FB)53 FeatureBitset MCSubtargetInfo::ToggleFeature(uint64_t FB) {
54 FeatureBits.flip(FB);
55 return FeatureBits;
56 }
57
ToggleFeature(const FeatureBitset & FB)58 FeatureBitset MCSubtargetInfo::ToggleFeature(const FeatureBitset &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.
ToggleFeature(StringRef FS)65 FeatureBitset MCSubtargetInfo::ToggleFeature(StringRef FS) {
66 SubtargetFeatures Features;
67 FeatureBits = Features.ToggleFeature(FeatureBits, FS, ProcFeatures);
68 return FeatureBits;
69 }
70
ApplyFeatureFlag(StringRef FS)71 FeatureBitset MCSubtargetInfo::ApplyFeatureFlag(StringRef FS) {
72 SubtargetFeatures Features;
73 FeatureBits = Features.ApplyFeatureFlag(FeatureBits, FS, ProcFeatures);
74 return FeatureBits;
75 }
76
getSchedModelForCPU(StringRef CPU) const77 const MCSchedModel &MCSubtargetInfo::getSchedModelForCPU(StringRef CPU) const {
78 assert(ProcSchedModels && "Processor machine model not available!");
79
80 size_t NumProcs = ProcDesc.size();
81 assert(std::is_sorted(ProcSchedModels, ProcSchedModels+NumProcs,
82 [](const SubtargetInfoKV &LHS, const SubtargetInfoKV &RHS) {
83 return strcmp(LHS.Key, RHS.Key) < 0;
84 }) &&
85 "Processor machine model table is not sorted");
86
87 // Find entry
88 const SubtargetInfoKV *Found =
89 std::lower_bound(ProcSchedModels, ProcSchedModels+NumProcs, CPU);
90 if (Found == ProcSchedModels+NumProcs || StringRef(Found->Key) != CPU) {
91 if (CPU != "help") // Don't error if the user asked for help.
92 errs() << "'" << CPU
93 << "' is not a recognized processor for this target"
94 << " (ignoring processor)\n";
95 return MCSchedModel::GetDefaultSchedModel();
96 }
97 assert(Found->Value && "Missing processor SchedModel value");
98 return *(const MCSchedModel *)Found->Value;
99 }
100
101 InstrItineraryData
getInstrItineraryForCPU(StringRef CPU) const102 MCSubtargetInfo::getInstrItineraryForCPU(StringRef CPU) const {
103 const MCSchedModel SchedModel = getSchedModelForCPU(CPU);
104 return InstrItineraryData(SchedModel, Stages, OperandCycles, ForwardingPaths);
105 }
106
107 /// Initialize an InstrItineraryData instance.
initInstrItins(InstrItineraryData & InstrItins) const108 void MCSubtargetInfo::initInstrItins(InstrItineraryData &InstrItins) const {
109 InstrItins = InstrItineraryData(getSchedModel(), Stages, OperandCycles,
110 ForwardingPaths);
111 }
112