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116 lines
4.0 KiB
C++
116 lines
4.0 KiB
C++
//===-- llvm/MC/SubtargetFeature.h - CPU characteristics --------*- C++ -*-===//
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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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//
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// This file defines and manages user or tool specified CPU characteristics.
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// The intent is to be able to package specific features that should or should
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// not be used on a specific target processor. A tool, such as llc, could, as
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// as example, gather chip info from the command line, a long with features
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// that should be used on that chip.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_SUBTARGETFEATURE_H
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#define LLVM_MC_SUBTARGETFEATURE_H
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#include <vector>
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#include "llvm/ADT/Triple.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class raw_ostream;
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class StringRef;
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//===----------------------------------------------------------------------===//
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///
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/// SubtargetFeatureKV - Used to provide key value pairs for feature and
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/// CPU bit flags.
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//
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struct SubtargetFeatureKV {
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const char *Key; // K-V key string
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const char *Desc; // Help descriptor
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uint64_t Value; // K-V integer value
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uint64_t Implies; // K-V bit mask
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// Compare routine for std binary search
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bool operator<(const SubtargetFeatureKV &S) const {
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return strcmp(Key, S.Key) < 0;
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}
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};
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//===----------------------------------------------------------------------===//
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///
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/// SubtargetInfoKV - Used to provide key value pairs for CPU and arbitrary
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/// pointers.
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//
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struct SubtargetInfoKV {
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const char *Key; // K-V key string
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void *Value; // K-V pointer value
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// Compare routine for std binary search
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bool operator<(const SubtargetInfoKV &S) const {
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return strcmp(Key, S.Key) < 0;
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}
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};
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//===----------------------------------------------------------------------===//
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///
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/// SubtargetFeatures - Manages the enabling and disabling of subtarget
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/// specific features. Features are encoded as a string of the form
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/// "cpu,+attr1,+attr2,-attr3,...,+attrN"
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/// A comma separates each feature from the next (all lowercase.)
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/// The first feature is always the CPU subtype (eg. pentiumm). If the CPU
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/// value is "generic" then the CPU subtype should be generic for the target.
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/// Each of the remaining features is prefixed with + or - indicating whether
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/// that feature should be enabled or disabled contrary to the cpu
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/// specification.
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///
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class SubtargetFeatures {
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std::vector<std::string> Features; // Subtarget features as a vector
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public:
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explicit SubtargetFeatures(const StringRef Initial = "");
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/// Features string accessors.
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std::string getString() const;
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/// Adding Features.
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void AddFeature(const StringRef String, bool IsEnabled = true);
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/// ToggleFeature - Toggle a feature and returns the newly updated feature
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/// bits.
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uint64_t ToggleFeature(uint64_t Bits, const StringRef String,
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const SubtargetFeatureKV *FeatureTable,
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size_t FeatureTableSize);
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/// Get feature bits of a CPU.
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uint64_t getFeatureBits(const StringRef CPU,
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const SubtargetFeatureKV *CPUTable,
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size_t CPUTableSize,
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const SubtargetFeatureKV *FeatureTable,
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size_t FeatureTableSize);
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/// Get scheduling itinerary of a CPU.
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void *getItinerary(const StringRef CPU,
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const SubtargetInfoKV *Table, size_t TableSize);
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/// Print feature string.
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void print(raw_ostream &OS) const;
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// Dump feature info.
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void dump() const;
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/// Retrieve a formatted string of the default features for the specified
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/// target triple.
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void getDefaultSubtargetFeatures(const Triple& Triple);
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};
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} // End namespace llvm
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#endif
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