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9a7c0031de
This is necessary for x86 where not all Sandybridge, Ivybrige, Haswell, and Broadwell CPUs support AVX. Currently we modify the CPU name back to Nehalem for this case, but that turns off additional features for these CPUs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233673 91177308-0d34-0410-b5e6-96231b3b80d8
106 lines
3.4 KiB
C++
106 lines
3.4 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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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::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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uint64_t ToggleFeature(uint64_t Bits, StringRef String,
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ArrayRef<SubtargetFeatureKV> FeatureTable);
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/// Get feature bits of a CPU.
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uint64_t 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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