8de9f2b558
SubtargetFeature.h is currently part of MC while it doesn't depend on anything in MC. Since some LLVM components might have the need to work with target features without necessarily needing MC, it might be worthwhile to move SubtargetFeature.h to a different location. This will reduce the dependencies of said components. Note that I choose TargetParser as the destination because that's where Triple lives and SubtargetFeatures feels related to that. This issues came up during a JITLink review (D149522). JITLink would like to avoid a dependency on MC while still needing to store target features. Reviewed By: MaskRay, arsenm Differential Revision: https://reviews.llvm.org/D150549
86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
//===- SubtargetFeature.cpp - CPU characteristics Implementation ----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file Implements the SubtargetFeature interface.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/TargetParser/SubtargetFeature.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/TargetParser/Triple.h"
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#include <algorithm>
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#include <string>
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#include <vector>
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using namespace llvm;
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/// Splits a string of comma separated items in to a vector of strings.
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void SubtargetFeatures::Split(std::vector<std::string> &V, StringRef S) {
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SmallVector<StringRef, 3> Tmp;
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S.split(Tmp, ',', -1, false /* KeepEmpty */);
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V.reserve(Tmp.size());
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for (StringRef T : Tmp)
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V.push_back(std::string(T));
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}
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void SubtargetFeatures::AddFeature(StringRef String, bool Enable) {
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// Don't add empty features.
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if (!String.empty())
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// Convert to lowercase, prepend flag if we don't already have a flag.
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Features.push_back(hasFlag(String) ? String.lower()
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: (Enable ? "+" : "-") + String.lower());
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}
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void SubtargetFeatures::addFeaturesVector(
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const ArrayRef<std::string> OtherFeatures) {
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Features.insert(Features.cend(), OtherFeatures.begin(), OtherFeatures.end());
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}
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SubtargetFeatures::SubtargetFeatures(StringRef Initial) {
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// Break up string into separate features
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Split(Features, Initial);
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}
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std::string SubtargetFeatures::getString() const {
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return join(Features.begin(), Features.end(), ",");
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}
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void SubtargetFeatures::print(raw_ostream &OS) const {
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for (const auto &F : Features)
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OS << F << " ";
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OS << "\n";
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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LLVM_DUMP_METHOD void SubtargetFeatures::dump() const {
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print(dbgs());
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}
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#endif
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void SubtargetFeatures::getDefaultSubtargetFeatures(const Triple& Triple) {
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// FIXME: This is an inelegant way of specifying the features of a
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// subtarget. It would be better if we could encode this information
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// into the IR. See <rdar://5972456>.
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if (Triple.getVendor() == Triple::Apple) {
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if (Triple.getArch() == Triple::ppc) {
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// powerpc-apple-*
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AddFeature("altivec");
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} else if (Triple.getArch() == Triple::ppc64) {
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// powerpc64-apple-*
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AddFeature("64bit");
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AddFeature("altivec");
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}
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}
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}
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