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ba9279f9d8
This can happen when processing command line arguments, which are often stored as std::string's and later turned into StringRef's via std::string::data(). Unfortunately this is not guaranteed to return a null-terminated string until C++11, causing breakage on platforms that don't do this. llvm-svn: 192558
122 lines
4.1 KiB
C++
122 lines
4.1 KiB
C++
//===-- MCSubtargetInfo.cpp - Subtarget Information -----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/MC/MCInstrItineraries.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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using namespace llvm;
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MCSchedModel MCSchedModel::DefaultSchedModel; // For unknown processors.
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/// InitMCProcessorInfo - Set or change the CPU (optionally supplemented
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/// with feature string). Recompute feature bits and scheduling model.
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void
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MCSubtargetInfo::InitMCProcessorInfo(StringRef CPU, StringRef FS) {
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SubtargetFeatures Features(FS);
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FeatureBits = Features.getFeatureBits(CPU, ProcDesc, NumProcs,
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ProcFeatures, NumFeatures);
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InitCPUSchedModel(CPU);
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}
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void
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MCSubtargetInfo::InitCPUSchedModel(StringRef CPU) {
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if (!CPU.empty())
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CPUSchedModel = getSchedModelForCPU(CPU);
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else
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CPUSchedModel = &MCSchedModel::DefaultSchedModel;
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}
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void
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MCSubtargetInfo::InitMCSubtargetInfo(StringRef TT, StringRef CPU, StringRef FS,
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const SubtargetFeatureKV *PF,
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const SubtargetFeatureKV *PD,
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const SubtargetInfoKV *ProcSched,
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const MCWriteProcResEntry *WPR,
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const MCWriteLatencyEntry *WL,
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const MCReadAdvanceEntry *RA,
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const InstrStage *IS,
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const unsigned *OC,
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const unsigned *FP,
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unsigned NF, unsigned NP) {
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TargetTriple = TT;
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ProcFeatures = PF;
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ProcDesc = PD;
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ProcSchedModels = ProcSched;
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WriteProcResTable = WPR;
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WriteLatencyTable = WL;
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ReadAdvanceTable = RA;
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Stages = IS;
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OperandCycles = OC;
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ForwardingPaths = FP;
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NumFeatures = NF;
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NumProcs = NP;
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InitMCProcessorInfo(CPU, FS);
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}
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/// ToggleFeature - Toggle a feature and returns the re-computed feature
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/// bits. This version does not change the implied bits.
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uint64_t MCSubtargetInfo::ToggleFeature(uint64_t FB) {
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FeatureBits ^= FB;
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return FeatureBits;
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}
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/// ToggleFeature - Toggle a feature and returns the re-computed feature
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/// bits. This version will also change all implied bits.
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uint64_t MCSubtargetInfo::ToggleFeature(StringRef FS) {
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SubtargetFeatures Features;
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FeatureBits = Features.ToggleFeature(FeatureBits, FS,
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ProcFeatures, NumFeatures);
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return FeatureBits;
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}
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const MCSchedModel *
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MCSubtargetInfo::getSchedModelForCPU(StringRef CPU) const {
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assert(ProcSchedModels && "Processor machine model not available!");
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#ifndef NDEBUG
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for (size_t i = 1; i < NumProcs; i++) {
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assert(strcmp(ProcSchedModels[i - 1].Key, ProcSchedModels[i].Key) < 0 &&
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"Processor machine model table is not sorted");
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}
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#endif
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// Find entry
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const SubtargetInfoKV *Found =
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std::lower_bound(ProcSchedModels, ProcSchedModels+NumProcs, CPU);
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if (Found == ProcSchedModels+NumProcs || StringRef(Found->Key) != CPU) {
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errs() << "'" << CPU
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<< "' is not a recognized processor for this target"
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<< " (ignoring processor)\n";
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return &MCSchedModel::DefaultSchedModel;
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}
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assert(Found->Value && "Missing processor SchedModel value");
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return (const MCSchedModel *)Found->Value;
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}
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InstrItineraryData
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MCSubtargetInfo::getInstrItineraryForCPU(StringRef CPU) const {
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const MCSchedModel *SchedModel = getSchedModelForCPU(CPU);
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return InstrItineraryData(SchedModel, Stages, OperandCycles, ForwardingPaths);
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}
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/// Initialize an InstrItineraryData instance.
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void MCSubtargetInfo::initInstrItins(InstrItineraryData &InstrItins) const {
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InstrItins =
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InstrItineraryData(CPUSchedModel, Stages, OperandCycles, ForwardingPaths);
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}
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