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872dd0d21c
This should avoid exceeding the maximum size when I add another subtarget feature to ARM's subtarget. llvm-svn: 242754
128 lines
4.3 KiB
C++
128 lines
4.3 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 "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Support/DataTypes.h"
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#include <bitset>
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namespace llvm {
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class raw_ostream;
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class StringRef;
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// A container class for subtarget features.
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// This is convenient because std::bitset does not have a constructor
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// with an initializer list of set bits.
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const unsigned MAX_SUBTARGET_FEATURES = 96;
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class FeatureBitset : public std::bitset<MAX_SUBTARGET_FEATURES> {
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public:
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// Cannot inherit constructors because it's not supported by VC++..
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FeatureBitset() : bitset() {}
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FeatureBitset(const bitset<MAX_SUBTARGET_FEATURES>& B) : bitset(B) {}
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FeatureBitset(std::initializer_list<unsigned> Init) : bitset() {
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for (auto I = Init.begin() , E = Init.end(); I != E; ++I)
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set(*I);
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}
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};
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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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FeatureBitset Value; // K-V integer value
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FeatureBitset Implies; // K-V bit mask
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// Compare routine for std::lower_bound
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bool operator<(StringRef S) const {
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return StringRef(Key) < S;
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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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const void *Value; // K-V pointer value
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// Compare routine for std::lower_bound
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bool operator<(StringRef S) const {
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return StringRef(Key) < S;
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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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/// "+attr1,+attr2,-attr3,...,+attrN"
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/// A comma separates each feature from the next (all lowercase.)
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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(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(StringRef String, bool Enable = true);
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/// ToggleFeature - Toggle a feature and returns the newly updated feature
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/// bits.
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FeatureBitset ToggleFeature(FeatureBitset Bits, StringRef String,
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ArrayRef<SubtargetFeatureKV> FeatureTable);
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/// Apply the feature flag and return the newly updated feature bits.
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FeatureBitset ApplyFeatureFlag(FeatureBitset Bits, StringRef Feature,
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ArrayRef<SubtargetFeatureKV> FeatureTable);
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/// Get feature bits of a CPU.
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FeatureBitset getFeatureBits(StringRef CPU,
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ArrayRef<SubtargetFeatureKV> CPUTable,
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ArrayRef<SubtargetFeatureKV> FeatureTable);
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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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/// Adds the default features for the specified 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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