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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23210 91177308-0d34-0410-b5e6-96231b3b80d8
147 lines
5.0 KiB
C++
147 lines
5.0 KiB
C++
//===-- llvm/Target/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 was developed by Jim Laskey and is distributed under the
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// University of Illinois Open Source 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_TARGET_SUBTARGETFEATURE_H
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#define LLVM_TARGET_SUBTARGETFEATURE_H
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#include <string>
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#include <vector>
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#include <iostream>
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#include <cassert>
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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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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uint32_t Value; // K-V integer value
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// Compare routine for std binary search
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bool operator<(const std::string &S) const {
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return strcmp(Key, S.c_str()) < 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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private:
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std::vector<std::string> Features; // Subtarget features as a vector
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// Determine if a feature has a flag; '+' or '-'
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static inline bool hasFlag(const std::string &Feature) {
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assert(!Feature.empty() && "Empty string");
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// Get first character
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char Ch = Feature[0];
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// Check if first character is '+' or '-' flag
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return Ch == '+' || Ch =='-';
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}
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// Return true if enable flag; '+'.
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static inline bool isEnabled(const std::string &Feature) {
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assert(!Feature.empty() && "Empty string");
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// Get first character
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char Ch = Feature[0];
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// Check if first character is '+' for enabled
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return Ch == '+';
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}
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// Return a string with a prepended flag; '+' or '-'.
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static inline std::string PrependFlag(const std::string &Feature,
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bool IsEnabled) {
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assert(!Feature.empty() && "Empty string");
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if (hasFlag(Feature)) return Feature;
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return std::string(IsEnabled ? "+" : "-") + Feature;
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}
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// Return string stripped of flag.
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static inline std::string StripFlag(const std::string &Feature) {
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return hasFlag(Feature) ? Feature.substr(1) : Feature;
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}
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/// Splits a string of comma separated items in to a vector of strings.
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static void Split(std::vector<std::string> &V, const std::string &S);
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/// Join a vector of strings into a string with a comma separating each
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/// item.
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static std::string Join(const std::vector<std::string> &V);
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/// Convert a string to lowercase.
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static std::string toLower(const std::string &S);
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/// Find item in array using binary search.
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static const SubtargetFeatureKV *Find(const std::string &S,
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const SubtargetFeatureKV *A, size_t L);
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public:
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/// Ctor.
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SubtargetFeatures(const std::string Initial = std::string()) {
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// Break up string into separate features
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Split(Features, Initial);
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}
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/// Features string accessors.
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inline std::string getString() const { return Join(Features); }
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void setString(const std::string &Initial) {
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// Throw out old features
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Features.clear();
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// Break up string into separate features
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Split(Features, toLower(Initial));
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}
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/// Setting CPU string. Replaces previous setting. Setting to "" clears CPU.
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void setCPU(std::string String) { Features[0] = toLower(String); }
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/// Adding Features.
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void AddFeature(const std::string &String, bool IsEnabled = true);
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/// Parse feature string for quick usage.
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static uint32_t Parse(const std::string &String,
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const std::string &DefaultCPU,
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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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/// Print feature string.
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void print(std::ostream &OS) const;
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// Dump feature info.
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void dump() const;
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};
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} // End namespace llvm
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#endif
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