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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 <algorithm>
23#include <string>
24#include <vector>
25
26using namespace llvm;
27
28/// Splits a string of comma separated items in to a vector of strings.
29void SubtargetFeatures::Split(std::vector<std::string> &V, StringRef S) {
30SmallVector<StringRef, 3> Tmp;
31S.split(Tmp, ',', -1, false /* KeepEmpty */);
32V.reserve(Tmp.size());
33for (StringRef T : Tmp)
34V.push_back(std::string(T));
35}
36
37void SubtargetFeatures::AddFeature(StringRef String, bool Enable) {
38// Don't add empty features.
39if (!String.empty())
40// Convert to lowercase, prepend flag if we don't already have a flag.
41Features.push_back(hasFlag(String) ? String.lower()
42: (Enable ? "+" : "-") + String.lower());
43}
44
45void SubtargetFeatures::addFeaturesVector(
46const ArrayRef<std::string> OtherFeatures) {
47Features.insert(Features.cend(), OtherFeatures.begin(), OtherFeatures.end());
48}
49
50SubtargetFeatures::SubtargetFeatures(StringRef Initial) {
51// Break up string into separate features
52Split(Features, Initial);
53}
54
55std::string SubtargetFeatures::getString() const {
56return join(Features.begin(), Features.end(), ",");
57}
58
59void SubtargetFeatures::print(raw_ostream &OS) const {
60for (const auto &F : Features)
61OS << F << " ";
62OS << "\n";
63}
64
65#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
66LLVM_DUMP_METHOD void SubtargetFeatures::dump() const {
67print(dbgs());
68}
69#endif
70
71void SubtargetFeatures::getDefaultSubtargetFeatures(const Triple& Triple) {
72// FIXME: This is an inelegant way of specifying the features of a
73// subtarget. It would be better if we could encode this information
74// into the IR.
75if (Triple.getVendor() == Triple::Apple) {
76if (Triple.getArch() == Triple::ppc) {
77// powerpc-apple-*
78AddFeature("altivec");
79} else if (Triple.getArch() == Triple::ppc64) {
80// powerpc64-apple-*
81AddFeature("64bit");
82AddFeature("altivec");
83}
84}
85}
86