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-rw-r--r--lib/Target/SubtargetFeature.cpp384
1 files changed, 0 insertions, 384 deletions
diff --git a/lib/Target/SubtargetFeature.cpp b/lib/Target/SubtargetFeature.cpp
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-//===- 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/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/StringExtras.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 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 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.
- 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";
-
- // 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() << "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 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);
-}
-
-/// 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.
-///
-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);
- }
- }
-}
-
-/// getBits - Get feature bits.
-///
-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");
-#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 (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 {
- 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];
-
- // 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 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 {
- 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 std::string &CPU,
- const Triple& Triple) {
- setCPU(CPU);
-
- 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");
- }
- }
-}
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