//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Jim Laskey and is distributed under the
+// This file was developed by James M. Laskey and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
#include "llvm/Target/SubtargetFeature.h"
-
-#include <string>
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/Streams.h"
#include <algorithm>
-#include <vector>
+#include <ostream>
#include <cassert>
#include <cctype>
-
using namespace llvm;
-/// Splits a string of comma separated items in to a vector of strings.
-void SubtargetFeatures::Split(std::vector<std::string> &V,
- const std::string &S) {
+//===----------------------------------------------------------------------===//
+// 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) {
}
/// Join a vector of strings to a string with a comma separating each element.
-std::string SubtargetFeatures::Join(const std::vector<std::string> &V) {
+///
+static std::string Join(const std::vector<std::string> &V) {
// Start with empty string.
std::string Result;
// If the vector is not empty
return Result;
}
-/// Convert a string to lowercase.
-std::string SubtargetFeatures::toLower(const std::string &S) {
- // Copy the string
- std::string Result = S;
- // For each character in string
- for (size_t i = 0; i < Result.size(); i++) {
- // Convert character to lowercase
- Result[i] = std::tolower(Result[i]);
- }
- // Return the lowercased 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(toLower(String), IsEnabled));
+ Features.push_back(PrependFlag(LowercaseString(String), IsEnabled));
}
}
-/// Find item in array using binary search.
-const SubtargetFeatureKV *
-SubtargetFeatures::Find(const std::string &S,
- const SubtargetFeatureKV *A, size_t L) {
+/// 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 SubtargetFeatureKV *Hi = A + L;
+ const T *Hi = A + L;
// Binary search the array
- const SubtargetFeatureKV *F = std::lower_bound(A, Hi, S);
+ 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.
-void SubtargetFeatures::Help(const char *Heading,
- const SubtargetFeatureKV *Table, size_t TableSize) {
- // Determine the length of the longest key
- size_t MaxLen = 0;
- for (size_t i = 0; i < TableSize; i++)
- MaxLen = std::max(MaxLen, std::strlen(Table[i].Key));
- // Print heading
- std::cerr << "Help for " << Heading << " choices\n\n";
- // For each feature
- for (size_t i = 0; i < TableSize; i++) {
- // Compute required padding
- size_t Pad = MaxLen - std::strlen(Table[i].Key) + 1;
- // Print details
- std::cerr << Table[i].Key << std::string(Pad, ' ') << " - "
- << Table[i].Desc << "\n";
+///
+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);
}
- // Wrap it up
- std::cerr << "\n\n";
- // Leave tool
- exit(1);
-}
-
-/// Parse feature string for quick usage.
-uint32_t SubtargetFeatures::Parse(const std::string &String,
- const std::string &DefaultCPU,
- const SubtargetFeatureKV *CPUTable,
- size_t CPUTableSize,
- const SubtargetFeatureKV *FeatureTable,
- size_t 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
"CPU features table is not sorted");
}
#endif
- std::vector<std::string> Features; // Subtarget features as a vector
uint32_t Bits = 0; // Resulting bits
- // Split up features
- Split(Features, String);
- // Check if default is needed
- if (Features[0].empty()) Features[0] = DefaultCPU;
- // Check for help
- if (Features[0] == "help") Help("CPU", CPUTable, CPUTableSize);
+
+ // 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 (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 {
- std::cerr << Features[0]
- << " is not a recognized processor for this target"
- << " (ignoring processor)"
- << "\n";
+ 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++) {
- // Get next feature
const std::string &Feature = Features[i];
+
// Check for help
- if (Feature == "+help") Help("feature", FeatureTable, FeatureTableSize);
+ 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;
- else Bits &= ~FeatureEntry->Value;
+ 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 {
- std::cerr << Feature
- << " is not a recognized feature for this target"
- << " (ignoring feature)"
- << "\n";
+ cerr << "'" << Feature
+ << "' is not a recognized feature for this target"
+ << " (ignoring feature)"
+ << "\n";
}
}
+
return Bits;
}
-/// Print feature string.
+/// 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 feature info.
+/// dump - Dump feature info.
+///
void SubtargetFeatures::dump() const {
- print(std::cerr);
+ print(*cerr.stream());
}
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