#include "llvm/MC/SubtargetFeature.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/StringExtras.h"
#include <algorithm>
#include <cassert>
#include <cctype>
/// hasFlag - Determine if a feature has a flag; '+' or '-'
///
-static inline bool hasFlag(const std::string &Feature) {
+static inline bool hasFlag(const StringRef Feature) {
assert(!Feature.empty() && "Empty string");
// Get first character
char Ch = Feature[0];
/// StripFlag - Return string stripped of flag.
///
-static inline std::string StripFlag(const std::string &Feature) {
+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 std::string &Feature) {
+static inline bool isEnabled(const StringRef Feature) {
assert(!Feature.empty() && "Empty string");
// Get first character
char Ch = Feature[0];
/// PrependFlag - Return a string with a prepended flag; '+' or '-'.
///
-static inline std::string PrependFlag(const std::string &Feature,
- bool IsEnabled) {
+static inline std::string PrependFlag(const StringRef Feature,
+ bool IsEnabled) {
assert(!Feature.empty() && "Empty string");
- if (hasFlag(Feature)) return Feature;
- return std::string(IsEnabled ? "+" : "-") + Feature;
+ 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 std::string &S) {
+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) {
static std::string Join(const std::vector<std::string> &V) {
// Start with empty string.
std::string Result;
- // If the vector is not empty
+ // If the vector is not empty
if (!V.empty()) {
- // Start with the CPU feature
+ // Start with the first feature
Result = V[0];
// For each successive feature
for (size_t i = 1; i < V.size(); i++) {
Result += V[i];
}
}
- // Return the features string
+ // Return the features string
return Result;
}
/// Adding features.
-void SubtargetFeatures::AddFeature(const std::string &String,
+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(LowercaseString(String), IsEnabled));
+ Features.push_back(PrependFlag(String.lower(), 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();
+static const SubtargetFeatureKV *Find(StringRef S, const SubtargetFeatureKV *A,
+ size_t L) {
// Determine the end of the array
- const T *Hi = A + L;
+ const SubtargetFeatureKV *Hi = A + L;
// Binary search the array
- const T *F = std::lower_bound(A, Hi, KV);
+ const SubtargetFeatureKV *F = std::lower_bound(A, Hi, S);
// If not found then return NULL
- if (F == Hi || std::string(F->Key) != S) return NULL;
+ if (F == Hi || StringRef(F->Key) != S) return NULL;
// Return the found array item
return F;
}
// Print the CPU table.
errs() << "Available CPUs for this target:\n\n";
for (size_t i = 0; i != CPUTableSize; i++)
- errs() << " " << CPUTable[i].Key
- << std::string(MaxCPULen - std::strlen(CPUTable[i].Key), ' ')
- << " - " << CPUTable[i].Desc << ".\n";
- errs() << "\n";
-
+ 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() << " " << FeatTable[i].Key
- << std::string(MaxFeatLen - std::strlen(FeatTable[i].Key), ' ')
- << " - " << FeatTable[i].Desc << ".\n";
- errs() << "\n";
-
+ 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";
+ "For example, llc -mcpu=mycpu -mattr=+feature1,-feature2\n";
std::exit(1);
}
// SubtargetFeatures Implementation
//===----------------------------------------------------------------------===//
-SubtargetFeatures::SubtargetFeatures(const std::string &Initial) {
+SubtargetFeatures::SubtargetFeatures(const StringRef 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);
-}
-
-/// getCPU - Returns current CPU.
-///
-const std::string & SubtargetFeatures::getCPU() const {
- return Features[0];
-}
-
/// SetImpliedBits - For each feature that is (transitively) implied by this
/// feature, set it.
/// ClearImpliedBits - For each feature that (transitively) implies this
/// feature, clear it.
-///
+///
static
void ClearImpliedBits(uint64_t &Bits, const SubtargetFeatureKV *FeatureEntry,
const SubtargetFeatureKV *FeatureTable,
}
}
-/// getBits - Get feature bits.
+/// 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::getBits(const SubtargetFeatureKV *CPUTable,
- size_t CPUTableSize,
- const SubtargetFeatureKV *FeatureTable,
- size_t FeatureTableSize) {
- assert(CPUTable && "missing CPU table");
- assert(FeatureTable && "missing features table");
+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 &&
uint64_t Bits = 0; // Resulting bits
// Check if help is needed
- if (Features[0] == "help")
+ if (CPU == "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);
+
+ // 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";
}
- } else {
- errs() << "'" << 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];
-
+ 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);
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 {
- errs() << "'" << Features[0]
- << "' is not a recognized processor for this target"
- << " (ignoring processor)\n";
- return NULL;
- }
-}
-
/// print - Print feature string.
///
void SubtargetFeatures::print(raw_ostream &OS) const {
OS << "\n";
}
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
/// dump - Dump feature info.
///
void SubtargetFeatures::dump() const {
print(dbgs());
}
+#endif
-/// getDefaultSubtargetFeatures - Return a string listing the features
-/// associated with the target triple.
+/// Adds the default features for the specified 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 std::string &CPU,
- const Triple& Triple) {
- setCPU(CPU);
-
+void SubtargetFeatures::getDefaultSubtargetFeatures(const Triple& Triple) {
if (Triple.getVendor() == Triple::Apple) {
if (Triple.getArch() == Triple::ppc) {
// powerpc-apple-*
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