| //===- SubtargetFeature.cpp - CPU characteristics Implementation ----------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| /// \file Implements the SubtargetFeature interface. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/MC/SubtargetFeature.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/ADT/StringRef.h" |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/Config/llvm-config.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <algorithm> |
| #include <cassert> |
| #include <cstddef> |
| #include <cstring> |
| #include <iterator> |
| #include <string> |
| #include <vector> |
| |
| using namespace llvm; |
| |
| /// Splits a string of comma separated items in to a vector of strings. |
| void SubtargetFeatures::Split(std::vector<std::string> &V, StringRef S) { |
| SmallVector<StringRef, 3> Tmp; |
| S.split(Tmp, ',', -1, false /* KeepEmpty */); |
| V.reserve(Tmp.size()); |
| for (StringRef T : Tmp) |
| V.push_back(std::string(T)); |
| } |
| |
| 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.lower() |
| : (Enable ? "+" : "-") + String.lower()); |
| } |
| |
| SubtargetFeatures::SubtargetFeatures(StringRef Initial) { |
| // Break up string into separate features |
| Split(Features, Initial); |
| } |
| |
| std::string SubtargetFeatures::getString() const { |
| return join(Features.begin(), Features.end(), ","); |
| } |
| |
| void SubtargetFeatures::print(raw_ostream &OS) const { |
| for (auto &F : Features) |
| OS << F << " "; |
| OS << "\n"; |
| } |
| |
| #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
| LLVM_DUMP_METHOD void SubtargetFeatures::dump() const { |
| print(dbgs()); |
| } |
| #endif |
| |
| void SubtargetFeatures::getDefaultSubtargetFeatures(const Triple& 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>. |
| 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"); |
| } |
| } |
| } |