mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 11:42:57 +01:00
396 lines
12 KiB
C++
396 lines
12 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/MC/SubtargetFeature.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/Format.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include <algorithm>
|
|
#include <cassert>
|
|
#include <cctype>
|
|
#include <cstdlib>
|
|
using namespace llvm;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Static Helper Functions
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// hasFlag - Determine if a feature has a flag; '+' or '-'
|
|
///
|
|
static inline bool hasFlag(const StringRef 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 StringRef Feature) {
|
|
return hasFlag(Feature) ? Feature.substr(1) : Feature;
|
|
}
|
|
|
|
/// isEnabled - Return true if enable flag; '+'.
|
|
///
|
|
static inline bool isEnabled(const StringRef 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 StringRef Feature,
|
|
bool IsEnabled) {
|
|
assert(!Feature.empty() && "Empty string");
|
|
if (hasFlag(Feature))
|
|
return Feature;
|
|
std::string Prefix = IsEnabled ? "+" : "-";
|
|
Prefix += Feature;
|
|
return Prefix;
|
|
}
|
|
|
|
/// Split - Splits a string of comma separated items in to a vector of strings.
|
|
///
|
|
static void Split(std::vector<std::string> &V, const StringRef S) {
|
|
if (S.empty())
|
|
return;
|
|
|
|
// 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 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 first 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 StringRef String,
|
|
bool IsEnabled) {
|
|
// Don't add empty features
|
|
if (!String.empty()) {
|
|
// Convert to lowercase, prepend flag and add to vector
|
|
Features.push_back(PrependFlag(String.lower(), IsEnabled));
|
|
}
|
|
}
|
|
|
|
/// Find KV in array using binary search.
|
|
template<typename T> const T *Find(const StringRef S, const T *A, size_t L) {
|
|
// Make the lower bound element we're looking for
|
|
T KV;
|
|
KV.Key = S.data();
|
|
// 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 || StringRef(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.
|
|
errs() << "Available CPUs for this target:\n\n";
|
|
for (size_t i = 0; i != CPUTableSize; i++)
|
|
errs() << format(" %-*s - %s.\n",
|
|
MaxCPULen, CPUTable[i].Key, CPUTable[i].Desc);
|
|
errs() << '\n';
|
|
|
|
// Print the Feature table.
|
|
errs() << "Available features for this target:\n\n";
|
|
for (size_t i = 0; i != FeatTableSize; i++)
|
|
errs() << format(" %-*s - %s.\n",
|
|
MaxFeatLen, FeatTable[i].Key, FeatTable[i].Desc);
|
|
errs() << '\n';
|
|
|
|
errs() << "Use +feature to enable a feature, or -feature to disable it.\n"
|
|
"For example, llc -mcpu=mycpu -mattr=+feature1,-feature2\n";
|
|
std::exit(1);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// SubtargetFeatures Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
SubtargetFeatures::SubtargetFeatures(const StringRef Initial) {
|
|
// Break up string into separate features
|
|
Split(Features, Initial);
|
|
}
|
|
|
|
|
|
std::string SubtargetFeatures::getString() const {
|
|
return Join(Features);
|
|
}
|
|
|
|
/// SetImpliedBits - For each feature that is (transitively) implied by this
|
|
/// feature, set it.
|
|
///
|
|
static
|
|
void SetImpliedBits(uint64_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(uint64_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);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// ToggleFeature - Toggle a feature and returns the newly updated feature
|
|
/// bits.
|
|
uint64_t
|
|
SubtargetFeatures::ToggleFeature(uint64_t Bits, const StringRef Feature,
|
|
const SubtargetFeatureKV *FeatureTable,
|
|
size_t FeatureTableSize) {
|
|
// Find feature in table.
|
|
const SubtargetFeatureKV *FeatureEntry =
|
|
Find(StripFlag(Feature), FeatureTable, FeatureTableSize);
|
|
// If there is a match
|
|
if (FeatureEntry) {
|
|
if ((Bits & FeatureEntry->Value) == FeatureEntry->Value) {
|
|
Bits &= ~FeatureEntry->Value;
|
|
|
|
// For each feature that implies this, clear it.
|
|
ClearImpliedBits(Bits, FeatureEntry, FeatureTable, FeatureTableSize);
|
|
} else {
|
|
Bits |= FeatureEntry->Value;
|
|
|
|
// For each feature that this implies, set it.
|
|
SetImpliedBits(Bits, FeatureEntry, FeatureTable, FeatureTableSize);
|
|
}
|
|
} else {
|
|
errs() << "'" << Feature
|
|
<< "' is not a recognized feature for this target"
|
|
<< " (ignoring feature)\n";
|
|
}
|
|
|
|
return Bits;
|
|
}
|
|
|
|
|
|
/// getFeatureBits - Get feature bits a CPU.
|
|
///
|
|
uint64_t SubtargetFeatures::getFeatureBits(const StringRef CPU,
|
|
const SubtargetFeatureKV *CPUTable,
|
|
size_t CPUTableSize,
|
|
const SubtargetFeatureKV *FeatureTable,
|
|
size_t FeatureTableSize) {
|
|
if (!FeatureTableSize || !CPUTableSize)
|
|
return 0;
|
|
|
|
#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
|
|
uint64_t Bits = 0; // Resulting bits
|
|
|
|
// Check if help is needed
|
|
if (CPU == "help")
|
|
Help(CPUTable, CPUTableSize, FeatureTable, FeatureTableSize);
|
|
|
|
// Find CPU entry if CPU name is specified.
|
|
if (!CPU.empty()) {
|
|
const SubtargetFeatureKV *CPUEntry = Find(CPU, 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 {
|
|
errs() << "'" << CPU
|
|
<< "' is not a recognized processor for this target"
|
|
<< " (ignoring processor)\n";
|
|
}
|
|
}
|
|
|
|
// Iterate through each feature
|
|
for (size_t i = 0, E = Features.size(); i < E; i++) {
|
|
const StringRef 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 {
|
|
errs() << "'" << Feature
|
|
<< "' is not a recognized feature for this target"
|
|
<< " (ignoring feature)\n";
|
|
}
|
|
}
|
|
|
|
return Bits;
|
|
}
|
|
|
|
/// Get scheduling itinerary of a CPU.
|
|
void *SubtargetFeatures::getItinerary(const StringRef CPU,
|
|
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(CPU, Table, TableSize);
|
|
|
|
if (Entry) {
|
|
return Entry->Value;
|
|
} else {
|
|
errs() << "'" << CPU
|
|
<< "' is not a recognized processor for this target"
|
|
<< " (ignoring processor)\n";
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/// print - Print feature string.
|
|
///
|
|
void SubtargetFeatures::print(raw_ostream &OS) const {
|
|
for (size_t i = 0, e = Features.size(); i != e; ++i)
|
|
OS << Features[i] << " ";
|
|
OS << "\n";
|
|
}
|
|
|
|
/// dump - Dump feature info.
|
|
///
|
|
void SubtargetFeatures::dump() const {
|
|
print(dbgs());
|
|
}
|
|
|
|
/// getDefaultSubtargetFeatures - Return a string listing the features
|
|
/// associated with the target triple.
|
|
///
|
|
/// FIXME: This is an inelegant way of specifying the features of a
|
|
/// subtarget. It would be better if we could encode this information
|
|
/// into the IR. See <rdar://5972456>.
|
|
///
|
|
void SubtargetFeatures::getDefaultSubtargetFeatures(const Triple& Triple) {
|
|
if (Triple.getVendor() == Triple::Apple) {
|
|
if (Triple.getArch() == Triple::ppc) {
|
|
// powerpc-apple-*
|
|
AddFeature("altivec");
|
|
} else if (Triple.getArch() == Triple::ppc64) {
|
|
// powerpc64-apple-*
|
|
AddFeature("64bit");
|
|
AddFeature("altivec");
|
|
}
|
|
}
|
|
}
|