1 //===- SubtargetFeature.cpp - CPU characteristics Implementation ----------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 /// \file Implements the SubtargetFeature interface. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "llvm/TargetParser/SubtargetFeature.h" 14 #include "llvm/ADT/SmallVector.h" 15 #include "llvm/ADT/StringExtras.h" 16 #include "llvm/ADT/StringRef.h" 17 #include "llvm/Config/llvm-config.h" 18 #include "llvm/Support/Compiler.h" 19 #include "llvm/Support/Debug.h" 20 #include "llvm/Support/raw_ostream.h" 21 #include "llvm/TargetParser/Triple.h" 22 #include <string> 23 #include <vector> 24 25 using namespace llvm; 26 27 /// Splits a string of comma separated items in to a vector of strings. 28 void SubtargetFeatures::Split(std::vector<std::string> &V, StringRef S) { 29 SmallVector<StringRef, 3> Tmp; 30 S.split(Tmp, ',', -1, false /* KeepEmpty */); 31 V.reserve(Tmp.size()); 32 for (StringRef T : Tmp) 33 V.push_back(std::string(T)); 34 } 35 36 void SubtargetFeatures::AddFeature(StringRef String, bool Enable) { 37 // Don't add empty features. 38 if (!String.empty()) 39 // Convert to lowercase, prepend flag if we don't already have a flag. 40 Features.push_back(hasFlag(String) ? String.lower() 41 : (Enable ? "+" : "-") + String.lower()); 42 } 43 44 void SubtargetFeatures::addFeaturesVector( 45 const ArrayRef<std::string> OtherFeatures) { 46 Features.insert(Features.cend(), OtherFeatures.begin(), OtherFeatures.end()); 47 } 48 49 SubtargetFeatures::SubtargetFeatures(StringRef Initial) { 50 // Break up string into separate features 51 Split(Features, Initial); 52 } 53 54 std::string SubtargetFeatures::getString() const { 55 return join(Features.begin(), Features.end(), ","); 56 } 57 58 void SubtargetFeatures::print(raw_ostream &OS) const { 59 for (const auto &F : Features) 60 OS << F << " "; 61 OS << "\n"; 62 } 63 64 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 65 LLVM_DUMP_METHOD void SubtargetFeatures::dump() const { 66 print(dbgs()); 67 } 68 #endif 69 70 void SubtargetFeatures::getDefaultSubtargetFeatures(const Triple& Triple) { 71 // FIXME: This is an inelegant way of specifying the features of a 72 // subtarget. It would be better if we could encode this information 73 // into the IR. 74 if (Triple.getVendor() == Triple::Apple) { 75 if (Triple.getArch() == Triple::ppc) { 76 // powerpc-apple-* 77 AddFeature("altivec"); 78 } else if (Triple.getArch() == Triple::ppc64) { 79 // powerpc64-apple-* 80 AddFeature("64bit"); 81 AddFeature("altivec"); 82 } 83 } 84 } 85