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9b9d97f26a
Previously, subtarget features were a bitfield with the underlying type being uint64_t. Since several targets (X86 and ARM, in particular) have hit or were very close to hitting this bound, switching the features to use a bitset. No functional change. The first several times this was committed (e.g. r229831, r233055), it caused several buildbot failures. Apparently the reason for most failures was both clang and gcc's inability to deal with large numbers (> 10K) of bitset constructor calls in tablegen-generated initializers of instruction info tables. This should now be fixed. llvm-svn: 238192
124 lines
4.1 KiB
C++
124 lines
4.1 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 = 64;
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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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/// 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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