//===----------------------------------------------------------------------===//
#include "llvm/MC/SubtargetFeature.h"
+#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
/// hasFlag - Determine if a feature has a flag; '+' or '-'
///
-static inline bool hasFlag(const StringRef Feature) {
+static inline bool hasFlag(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 StringRef Feature) {
+static inline std::string StripFlag(StringRef Feature) {
return hasFlag(Feature) ? Feature.substr(1) : Feature;
}
/// isEnabled - Return true if enable flag; '+'.
///
-static inline bool isEnabled(const StringRef Feature) {
+static inline bool isEnabled(StringRef Feature) {
assert(!Feature.empty() && "Empty string");
// Get first character
char Ch = Feature[0];
/// 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;
+static void Split(std::vector<std::string> &V, StringRef S) {
+ SmallVector<StringRef, 3> Tmp;
+ S.split(Tmp, ',', -1, false /* KeepEmpty */);
+ V.assign(Tmp.begin(), Tmp.end());
}
/// Adding features.
-void SubtargetFeatures::AddFeature(const StringRef String) {
- // Don't add empty features or features we already have.
+void SubtargetFeatures::AddFeature(StringRef String, bool Enable) {
+ // Don't add empty features.
if (!String.empty())
// Convert to lowercase, prepend flag if we don't already have a flag.
- Features.push_back(hasFlag(String) ? String.str() : "+" + String.lower());
+ Features.push_back(hasFlag(String) ? String.lower()
+ : (Enable ? "+" : "-") + String.lower());
}
/// Find KV in array using binary search.
// SubtargetFeatures Implementation
//===----------------------------------------------------------------------===//
-SubtargetFeatures::SubtargetFeatures(const StringRef Initial) {
+SubtargetFeatures::SubtargetFeatures(StringRef Initial) {
// Break up string into separate features
Split(Features, Initial);
}
std::string SubtargetFeatures::getString() const {
- return Join(Features);
+ return join(Features.begin(), Features.end(), ",");
}
/// SetImpliedBits - For each feature that is (transitively) implied by this
/// feature, set it.
///
static
-void SetImpliedBits(uint64_t &Bits, const SubtargetFeatureKV *FeatureEntry,
+void SetImpliedBits(FeatureBitset &Bits, const SubtargetFeatureKV *FeatureEntry,
ArrayRef<SubtargetFeatureKV> FeatureTable) {
for (auto &FE : FeatureTable) {
if (FeatureEntry->Value == FE.Value) continue;
- if (FeatureEntry->Implies & FE.Value) {
+ if ((FeatureEntry->Implies & FE.Value).any()) {
Bits |= FE.Value;
SetImpliedBits(Bits, &FE, FeatureTable);
}
/// feature, clear it.
///
static
-void ClearImpliedBits(uint64_t &Bits, const SubtargetFeatureKV *FeatureEntry,
+void ClearImpliedBits(FeatureBitset &Bits,
+ const SubtargetFeatureKV *FeatureEntry,
ArrayRef<SubtargetFeatureKV> FeatureTable) {
for (auto &FE : FeatureTable) {
if (FeatureEntry->Value == FE.Value) continue;
- if (FE.Implies & FeatureEntry->Value) {
+ if ((FE.Implies & FeatureEntry->Value).any()) {
Bits &= ~FE.Value;
ClearImpliedBits(Bits, &FE, FeatureTable);
}
/// ToggleFeature - Toggle a feature and returns the newly updated feature
/// bits.
-uint64_t
-SubtargetFeatures::ToggleFeature(uint64_t Bits, const StringRef Feature,
+FeatureBitset
+SubtargetFeatures::ToggleFeature(FeatureBitset Bits, StringRef Feature,
ArrayRef<SubtargetFeatureKV> FeatureTable) {
// Find feature in table.
if (FeatureEntry) {
if ((Bits & FeatureEntry->Value) == FeatureEntry->Value) {
Bits &= ~FeatureEntry->Value;
-
// For each feature that implies this, clear it.
ClearImpliedBits(Bits, FeatureEntry, FeatureTable);
} else {
return Bits;
}
+FeatureBitset
+SubtargetFeatures::ApplyFeatureFlag(FeatureBitset Bits, StringRef Feature,
+ ArrayRef<SubtargetFeatureKV> FeatureTable) {
+
+ assert(hasFlag(Feature));
+
+ // Find feature in table.
+ const SubtargetFeatureKV *FeatureEntry =
+ Find(StripFlag(Feature), FeatureTable);
+ // 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);
+ } else {
+ Bits &= ~FeatureEntry->Value;
+
+ // For each feature that implies this, clear it.
+ ClearImpliedBits(Bits, FeatureEntry, FeatureTable);
+ }
+ } 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,
+FeatureBitset
+SubtargetFeatures::getFeatureBits(StringRef CPU,
ArrayRef<SubtargetFeatureKV> CPUTable,
ArrayRef<SubtargetFeatureKV> FeatureTable) {
if (CPUTable.empty() || FeatureTable.empty())
- return 0;
+ return FeatureBitset();
#ifndef NDEBUG
- for (size_t i = 1, e = CPUTable.size(); i != e; ++i) {
- assert(strcmp(CPUTable[i - 1].Key, CPUTable[i].Key) < 0 &&
- "CPU table is not sorted");
- }
- for (size_t i = 1, e = FeatureTable.size(); i != e; ++i) {
- assert(strcmp(FeatureTable[i - 1].Key, FeatureTable[i].Key) < 0 &&
- "CPU features table is not sorted");
- }
+ assert(std::is_sorted(std::begin(CPUTable), std::end(CPUTable)) &&
+ "CPU table is not sorted");
+ assert(std::is_sorted(std::begin(FeatureTable), std::end(FeatureTable)) &&
+ "CPU features table is not sorted");
#endif
- uint64_t Bits = 0; // Resulting bits
+ // Resulting bits
+ FeatureBitset Bits;
// Check if help is needed
if (CPU == "help")
// Set the feature implied by this CPU feature, if any.
for (auto &FE : FeatureTable) {
- if (CPUEntry->Value & FE.Value)
+ if ((CPUEntry->Value & FE.Value).any())
SetImpliedBits(Bits, &FE, FeatureTable);
}
} else {
if (Feature == "+help")
Help(CPUTable, FeatureTable);
- // Find feature in table.
- const SubtargetFeatureKV *FeatureEntry =
- Find(StripFlag(Feature), FeatureTable);
- // 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);
- } else {
- Bits &= ~FeatureEntry->Value;
-
- // For each feature that implies this, clear it.
- ClearImpliedBits(Bits, FeatureEntry, FeatureTable);
- }
- } else {
- errs() << "'" << Feature
- << "' is not a recognized feature for this target"
- << " (ignoring feature)\n";
- }
+ Bits = ApplyFeatureFlag(Bits, Feature, FeatureTable);
}
return Bits;
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