forked from OSchip/llvm-project
358 lines
11 KiB
C++
358 lines
11 KiB
C++
//===- SubtargetFeature.cpp - CPU characteristics Implementation ----------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the SubtargetFeature interface.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Target/SubtargetFeature.h"
|
|
#include "llvm/ADT/StringExtras.h"
|
|
#include "llvm/Support/Streams.h"
|
|
#include <algorithm>
|
|
#include <ostream>
|
|
#include <cassert>
|
|
#include <cctype>
|
|
using namespace llvm;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Static Helper Functions
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// hasFlag - Determine if a feature has a flag; '+' or '-'
|
|
///
|
|
static inline bool hasFlag(const std::string &Feature) {
|
|
assert(!Feature.empty() && "Empty string");
|
|
// Get first character
|
|
char Ch = Feature[0];
|
|
// Check if first character is '+' or '-' flag
|
|
return Ch == '+' || Ch =='-';
|
|
}
|
|
|
|
/// StripFlag - Return string stripped of flag.
|
|
///
|
|
static inline std::string StripFlag(const std::string &Feature) {
|
|
return hasFlag(Feature) ? Feature.substr(1) : Feature;
|
|
}
|
|
|
|
/// isEnabled - Return true if enable flag; '+'.
|
|
///
|
|
static inline bool isEnabled(const std::string &Feature) {
|
|
assert(!Feature.empty() && "Empty string");
|
|
// Get first character
|
|
char Ch = Feature[0];
|
|
// Check if first character is '+' for enabled
|
|
return Ch == '+';
|
|
}
|
|
|
|
/// PrependFlag - Return a string with a prepended flag; '+' or '-'.
|
|
///
|
|
static inline std::string PrependFlag(const std::string &Feature,
|
|
bool IsEnabled) {
|
|
assert(!Feature.empty() && "Empty string");
|
|
if (hasFlag(Feature)) return Feature;
|
|
return std::string(IsEnabled ? "+" : "-") + Feature;
|
|
}
|
|
|
|
/// Split - Splits a string of comma separated items in to a vector of strings.
|
|
///
|
|
static void Split(std::vector<std::string> &V, const std::string &S) {
|
|
// Start at beginning of string.
|
|
size_t Pos = 0;
|
|
while (true) {
|
|
// Find the next comma
|
|
size_t Comma = S.find(',', Pos);
|
|
// If no comma found then the the rest of the string is used
|
|
if (Comma == std::string::npos) {
|
|
// Add string to vector
|
|
V.push_back(S.substr(Pos));
|
|
break;
|
|
}
|
|
// Otherwise add substring to vector
|
|
V.push_back(S.substr(Pos, Comma - Pos));
|
|
// Advance to next item
|
|
Pos = Comma + 1;
|
|
}
|
|
}
|
|
|
|
/// Join a vector of strings to a string with a comma separating each element.
|
|
///
|
|
static std::string Join(const std::vector<std::string> &V) {
|
|
// Start with empty string.
|
|
std::string Result;
|
|
// If the vector is not empty
|
|
if (!V.empty()) {
|
|
// Start with the CPU feature
|
|
Result = V[0];
|
|
// For each successive feature
|
|
for (size_t i = 1; i < V.size(); i++) {
|
|
// Add a comma
|
|
Result += ",";
|
|
// Add the feature
|
|
Result += V[i];
|
|
}
|
|
}
|
|
// Return the features string
|
|
return Result;
|
|
}
|
|
|
|
/// Adding features.
|
|
void SubtargetFeatures::AddFeature(const std::string &String,
|
|
bool IsEnabled) {
|
|
// Don't add empty features
|
|
if (!String.empty()) {
|
|
// Convert to lowercase, prepend flag and add to vector
|
|
Features.push_back(PrependFlag(LowercaseString(String), IsEnabled));
|
|
}
|
|
}
|
|
|
|
/// Find KV in array using binary search.
|
|
template<typename T> const T *Find(const std::string &S, const T *A, size_t L) {
|
|
// Make the lower bound element we're looking for
|
|
T KV;
|
|
KV.Key = S.c_str();
|
|
// Determine the end of the array
|
|
const T *Hi = A + L;
|
|
// Binary search the array
|
|
const T *F = std::lower_bound(A, Hi, KV);
|
|
// If not found then return NULL
|
|
if (F == Hi || std::string(F->Key) != S) return NULL;
|
|
// Return the found array item
|
|
return F;
|
|
}
|
|
|
|
/// getLongestEntryLength - Return the length of the longest entry in the table.
|
|
///
|
|
static size_t getLongestEntryLength(const SubtargetFeatureKV *Table,
|
|
size_t Size) {
|
|
size_t MaxLen = 0;
|
|
for (size_t i = 0; i < Size; i++)
|
|
MaxLen = std::max(MaxLen, std::strlen(Table[i].Key));
|
|
return MaxLen;
|
|
}
|
|
|
|
/// Display help for feature choices.
|
|
///
|
|
static void Help(const SubtargetFeatureKV *CPUTable, size_t CPUTableSize,
|
|
const SubtargetFeatureKV *FeatTable, size_t FeatTableSize) {
|
|
// Determine the length of the longest CPU and Feature entries.
|
|
unsigned MaxCPULen = getLongestEntryLength(CPUTable, CPUTableSize);
|
|
unsigned MaxFeatLen = getLongestEntryLength(FeatTable, FeatTableSize);
|
|
|
|
// Print the CPU table.
|
|
cerr << "Available CPUs for this target:\n\n";
|
|
for (size_t i = 0; i != CPUTableSize; i++)
|
|
cerr << " " << CPUTable[i].Key
|
|
<< std::string(MaxCPULen - std::strlen(CPUTable[i].Key), ' ')
|
|
<< " - " << CPUTable[i].Desc << ".\n";
|
|
cerr << "\n";
|
|
|
|
// Print the Feature table.
|
|
cerr << "Available features for this target:\n\n";
|
|
for (size_t i = 0; i != FeatTableSize; i++)
|
|
cerr << " " << FeatTable[i].Key
|
|
<< std::string(MaxFeatLen - std::strlen(FeatTable[i].Key), ' ')
|
|
<< " - " << FeatTable[i].Desc << ".\n";
|
|
cerr << "\n";
|
|
|
|
cerr << "Use +feature to enable a feature, or -feature to disable it.\n"
|
|
<< "For example, llc -mcpu=mycpu -mattr=+feature1,-feature2\n";
|
|
exit(1);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// SubtargetFeatures Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
SubtargetFeatures::SubtargetFeatures(const std::string &Initial) {
|
|
// Break up string into separate features
|
|
Split(Features, Initial);
|
|
}
|
|
|
|
|
|
std::string SubtargetFeatures::getString() const {
|
|
return Join(Features);
|
|
}
|
|
void SubtargetFeatures::setString(const std::string &Initial) {
|
|
// Throw out old features
|
|
Features.clear();
|
|
// Break up string into separate features
|
|
Split(Features, LowercaseString(Initial));
|
|
}
|
|
|
|
|
|
/// setCPU - Set the CPU string. Replaces previous setting. Setting to ""
|
|
/// clears CPU.
|
|
void SubtargetFeatures::setCPU(const std::string &String) {
|
|
Features[0] = LowercaseString(String);
|
|
}
|
|
|
|
|
|
/// setCPUIfNone - Setting CPU string only if no string is set.
|
|
///
|
|
void SubtargetFeatures::setCPUIfNone(const std::string &String) {
|
|
if (Features[0].empty()) setCPU(String);
|
|
}
|
|
|
|
/// SetImpliedBits - For each feature that is (transitively) implied by this
|
|
/// feature, set it.
|
|
///
|
|
static
|
|
void SetImpliedBits(uint32_t &Bits, const SubtargetFeatureKV *FeatureEntry,
|
|
const SubtargetFeatureKV *FeatureTable,
|
|
size_t FeatureTableSize) {
|
|
for (size_t i = 0; i < FeatureTableSize; ++i) {
|
|
const SubtargetFeatureKV &FE = FeatureTable[i];
|
|
|
|
if (FeatureEntry->Value == FE.Value) continue;
|
|
|
|
if (FeatureEntry->Implies & FE.Value) {
|
|
Bits |= FE.Value;
|
|
SetImpliedBits(Bits, &FE, FeatureTable, FeatureTableSize);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// ClearImpliedBits - For each feature that (transitively) implies this
|
|
/// feature, clear it.
|
|
///
|
|
static
|
|
void ClearImpliedBits(uint32_t &Bits, const SubtargetFeatureKV *FeatureEntry,
|
|
const SubtargetFeatureKV *FeatureTable,
|
|
size_t FeatureTableSize) {
|
|
for (size_t i = 0; i < FeatureTableSize; ++i) {
|
|
const SubtargetFeatureKV &FE = FeatureTable[i];
|
|
|
|
if (FeatureEntry->Value == FE.Value) continue;
|
|
|
|
if (FE.Implies & FeatureEntry->Value) {
|
|
Bits &= ~FE.Value;
|
|
ClearImpliedBits(Bits, &FE, FeatureTable, FeatureTableSize);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// getBits - Get feature bits.
|
|
///
|
|
uint32_t SubtargetFeatures::getBits(const SubtargetFeatureKV *CPUTable,
|
|
size_t CPUTableSize,
|
|
const SubtargetFeatureKV *FeatureTable,
|
|
size_t FeatureTableSize) {
|
|
assert(CPUTable && "missing CPU table");
|
|
assert(FeatureTable && "missing features table");
|
|
#ifndef NDEBUG
|
|
for (size_t i = 1; i < CPUTableSize; i++) {
|
|
assert(strcmp(CPUTable[i - 1].Key, CPUTable[i].Key) < 0 &&
|
|
"CPU table is not sorted");
|
|
}
|
|
for (size_t i = 1; i < FeatureTableSize; i++) {
|
|
assert(strcmp(FeatureTable[i - 1].Key, FeatureTable[i].Key) < 0 &&
|
|
"CPU features table is not sorted");
|
|
}
|
|
#endif
|
|
uint32_t Bits = 0; // Resulting bits
|
|
|
|
// Check if help is needed
|
|
if (Features[0] == "help")
|
|
Help(CPUTable, CPUTableSize, FeatureTable, FeatureTableSize);
|
|
|
|
// Find CPU entry
|
|
const SubtargetFeatureKV *CPUEntry =
|
|
Find(Features[0], CPUTable, CPUTableSize);
|
|
// If there is a match
|
|
if (CPUEntry) {
|
|
// Set base feature bits
|
|
Bits = CPUEntry->Value;
|
|
|
|
// Set the feature implied by this CPU feature, if any.
|
|
for (size_t i = 0; i < FeatureTableSize; ++i) {
|
|
const SubtargetFeatureKV &FE = FeatureTable[i];
|
|
if (CPUEntry->Value & FE.Value)
|
|
SetImpliedBits(Bits, &FE, FeatureTable, FeatureTableSize);
|
|
}
|
|
} else {
|
|
cerr << "'" << Features[0]
|
|
<< "' is not a recognized processor for this target"
|
|
<< " (ignoring processor)"
|
|
<< "\n";
|
|
}
|
|
// Iterate through each feature
|
|
for (size_t i = 1; i < Features.size(); i++) {
|
|
const std::string &Feature = Features[i];
|
|
|
|
// Check for help
|
|
if (Feature == "+help")
|
|
Help(CPUTable, CPUTableSize, FeatureTable, FeatureTableSize);
|
|
|
|
// Find feature in table.
|
|
const SubtargetFeatureKV *FeatureEntry =
|
|
Find(StripFlag(Feature), FeatureTable, FeatureTableSize);
|
|
// If there is a match
|
|
if (FeatureEntry) {
|
|
// Enable/disable feature in bits
|
|
if (isEnabled(Feature)) {
|
|
Bits |= FeatureEntry->Value;
|
|
|
|
// For each feature that this implies, set it.
|
|
SetImpliedBits(Bits, FeatureEntry, FeatureTable, FeatureTableSize);
|
|
} else {
|
|
Bits &= ~FeatureEntry->Value;
|
|
|
|
// For each feature that implies this, clear it.
|
|
ClearImpliedBits(Bits, FeatureEntry, FeatureTable, FeatureTableSize);
|
|
}
|
|
} else {
|
|
cerr << "'" << Feature
|
|
<< "' is not a recognized feature for this target"
|
|
<< " (ignoring feature)"
|
|
<< "\n";
|
|
}
|
|
}
|
|
|
|
return Bits;
|
|
}
|
|
|
|
/// Get info pointer
|
|
void *SubtargetFeatures::getInfo(const SubtargetInfoKV *Table,
|
|
size_t TableSize) {
|
|
assert(Table && "missing table");
|
|
#ifndef NDEBUG
|
|
for (size_t i = 1; i < TableSize; i++) {
|
|
assert(strcmp(Table[i - 1].Key, Table[i].Key) < 0 && "Table is not sorted");
|
|
}
|
|
#endif
|
|
|
|
// Find entry
|
|
const SubtargetInfoKV *Entry = Find(Features[0], Table, TableSize);
|
|
|
|
if (Entry) {
|
|
return Entry->Value;
|
|
} else {
|
|
cerr << "'" << Features[0]
|
|
<< "' is not a recognized processor for this target"
|
|
<< " (ignoring processor)"
|
|
<< "\n";
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/// print - Print feature string.
|
|
///
|
|
void SubtargetFeatures::print(std::ostream &OS) const {
|
|
for (size_t i = 0; i < Features.size(); i++) {
|
|
OS << Features[i] << " ";
|
|
}
|
|
OS << "\n";
|
|
}
|
|
|
|
/// dump - Dump feature info.
|
|
///
|
|
void SubtargetFeatures::dump() const {
|
|
print(*cerr.stream());
|
|
}
|