vendor/llvm/llvm-trunk-r366426

1 files changed, 4 insertions, 202 deletions

diff --git a/lib/MC/SubtargetFeature.cpp b/lib/MC/SubtargetFeature.cpp
index b69af24b531e..c4dd77359b24 100644
--- a/lib/MC/SubtargetFeature.cpp
+++ b/lib/MC/SubtargetFeature.cpp
@@ -1,9 +1,8 @@
 //===- 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.
+// 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
 //
 //===----------------------------------------------------------------------===//
 //
@@ -12,7 +11,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/MC/SubtargetFeature.h"
-#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"
@@ -20,7 +18,6 @@
 #include "llvm/Config/llvm-config.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
-#include "llvm/Support/Format.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cassert>
@@ -32,31 +29,8 @@
 
 using namespace llvm;
 
-/// Determine if a feature has a flag; '+' or '-'
-static inline bool hasFlag(StringRef Feature) {
-  assert(!Feature.empty() && "Empty string");
-  // Get first character
-  char Ch = Feature[0];
-  // Check if first character is '+' or '-' flag
-  return Ch == '+' || Ch =='-';
-}
-
-/// Return string stripped of flag.
-static inline std::string StripFlag(StringRef Feature) {
-  return hasFlag(Feature) ? Feature.substr(1) : Feature;
-}
-
-/// Return true if enable flag; '+'.
-static inline bool isEnabled(StringRef Feature) {
-  assert(!Feature.empty() && "Empty string");
-  // Get first character
-  char Ch = Feature[0];
-  // Check if first character is '+' for enabled
-  return Ch == '+';
-}
-
 /// Splits a string of comma separated items in to a vector of strings.
-static void Split(std::vector<std::string> &V, StringRef S) {
+void SubtargetFeatures::Split(std::vector<std::string> &V, StringRef S) {
   SmallVector<StringRef, 3> Tmp;
   S.split(Tmp, ',', -1, false /* KeepEmpty */);
   V.assign(Tmp.begin(), Tmp.end());
@@ -70,48 +44,6 @@ void SubtargetFeatures::AddFeature(StringRef String, bool Enable) {
                                        : (Enable ? "+" : "-") + String.lower());
 }
 
-/// Find KV in array using binary search.
-static const SubtargetFeatureKV *Find(StringRef S,
-                                      ArrayRef<SubtargetFeatureKV> A) {
-  // Binary search the array
-  auto F = std::lower_bound(A.begin(), A.end(), S);
-  // If not found then return NULL
-  if (F == A.end() || StringRef(F->Key) != S) return nullptr;
-  // Return the found array item
-  return F;
-}
-
-/// Return the length of the longest entry in the table.
-static size_t getLongestEntryLength(ArrayRef<SubtargetFeatureKV> Table) {
-  size_t MaxLen = 0;
-  for (auto &I : Table)
-    MaxLen = std::max(MaxLen, std::strlen(I.Key));
-  return MaxLen;
-}
-
-/// Display help for feature choices.
-static void Help(ArrayRef<SubtargetFeatureKV> CPUTable,
-                 ArrayRef<SubtargetFeatureKV> FeatTable) {
-  // Determine the length of the longest CPU and Feature entries.
-  unsigned MaxCPULen  = getLongestEntryLength(CPUTable);
-  unsigned MaxFeatLen = getLongestEntryLength(FeatTable);
-
-  // Print the CPU table.
-  errs() << "Available CPUs for this target:\n\n";
-  for (auto &CPU : CPUTable)
-    errs() << format("  %-*s - %s.\n", MaxCPULen, CPU.Key, CPU.Desc);
-  errs() << '\n';
-
-  // Print the Feature table.
-  errs() << "Available features for this target:\n\n";
-  for (auto &Feature : FeatTable)
-    errs() << format("  %-*s - %s.\n", MaxFeatLen, Feature.Key, Feature.Desc);
-  errs() << '\n';
-
-  errs() << "Use +feature to enable a feature, or -feature to disable it.\n"
-            "For example, llc -mcpu=mycpu -mattr=+feature1,-feature2\n";
-}
-
 SubtargetFeatures::SubtargetFeatures(StringRef Initial) {
   // Break up string into separate features
   Split(Features, Initial);
@@ -121,136 +53,6 @@ std::string SubtargetFeatures::getString() const {
   return join(Features.begin(), Features.end(), ",");
 }
 
-/// For each feature that is (transitively) implied by this feature, set it.
-static
-void SetImpliedBits(FeatureBitset &Bits, const SubtargetFeatureKV &FeatureEntry,
-                    ArrayRef<SubtargetFeatureKV> FeatureTable) {
-  for (const SubtargetFeatureKV &FE : FeatureTable) {
-    if (FeatureEntry.Value == FE.Value) continue;
-
-    if ((FeatureEntry.Implies & FE.Value).any()) {
-      Bits |= FE.Value;
-      SetImpliedBits(Bits, FE, FeatureTable);
-    }
-  }
-}
-
-/// For each feature that (transitively) implies this feature, clear it.
-static
-void ClearImpliedBits(FeatureBitset &Bits,
-                      const SubtargetFeatureKV &FeatureEntry,
-                      ArrayRef<SubtargetFeatureKV> FeatureTable) {
-  for (const SubtargetFeatureKV &FE : FeatureTable) {
-    if (FeatureEntry.Value == FE.Value) continue;
-
-    if ((FE.Implies & FeatureEntry.Value).any()) {
-      Bits &= ~FE.Value;
-      ClearImpliedBits(Bits, FE, FeatureTable);
-    }
-  }
-}
-
-void
-SubtargetFeatures::ToggleFeature(FeatureBitset &Bits, StringRef Feature,
-                                 ArrayRef<SubtargetFeatureKV> FeatureTable) {
-  // Find feature in table.
-  const SubtargetFeatureKV *FeatureEntry =
-      Find(StripFlag(Feature), FeatureTable);
-  // If there is a match
-  if (FeatureEntry) {
-    if ((Bits & FeatureEntry->Value) == FeatureEntry->Value) {
-      Bits &= ~FeatureEntry->Value;
-      // For each feature that implies this, clear it.
-      ClearImpliedBits(Bits, *FeatureEntry, FeatureTable);
-    } else {
-      Bits |=  FeatureEntry->Value;
-
-      // For each feature that this implies, set it.
-      SetImpliedBits(Bits, *FeatureEntry, FeatureTable);
-    }
-  } else {
-    errs() << "'" << Feature << "' is not a recognized feature for this target"
-           << " (ignoring feature)\n";
-  }
-}
-
-void SubtargetFeatures::ApplyFeatureFlag(FeatureBitset &Bits, StringRef Feature,
-                                    ArrayRef<SubtargetFeatureKV> FeatureTable) {
-  assert(hasFlag(Feature));
-
-  // Find feature in table.
-  const SubtargetFeatureKV *FeatureEntry =
-      Find(StripFlag(Feature), FeatureTable);
-  // 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);
-    } else {
-      Bits &= ~FeatureEntry->Value;
-
-      // For each feature that implies this, clear it.
-      ClearImpliedBits(Bits, *FeatureEntry, FeatureTable);
-    }
-  } else {
-    errs() << "'" << Feature << "' is not a recognized feature for this target"
-           << " (ignoring feature)\n";
-  }
-}
-
-FeatureBitset
-SubtargetFeatures::getFeatureBits(StringRef CPU,
-                                  ArrayRef<SubtargetFeatureKV> CPUTable,
-                                  ArrayRef<SubtargetFeatureKV> FeatureTable) {
-  if (CPUTable.empty() || FeatureTable.empty())
-    return FeatureBitset();
-
-  assert(std::is_sorted(std::begin(CPUTable), std::end(CPUTable)) &&
-         "CPU table is not sorted");
-  assert(std::is_sorted(std::begin(FeatureTable), std::end(FeatureTable)) &&
-         "CPU features table is not sorted");
-  // Resulting bits
-  FeatureBitset Bits;
-
-  // Check if help is needed
-  if (CPU == "help")
-    Help(CPUTable, FeatureTable);
-
-  // Find CPU entry if CPU name is specified.
-  else if (!CPU.empty()) {
-    const SubtargetFeatureKV *CPUEntry = Find(CPU, CPUTable);
-
-    // 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 (auto &FE : FeatureTable) {
-        if ((CPUEntry->Value & FE.Value).any())
-          SetImpliedBits(Bits, FE, FeatureTable);
-      }
-    } else {
-      errs() << "'" << CPU << "' is not a recognized processor for this target"
-             << " (ignoring processor)\n";
-    }
-  }
-
-  // Iterate through each feature
-  for (const std::string &Feature : Features) {
-    // Check for help
-    if (Feature == "+help")
-      Help(CPUTable, FeatureTable);
-
-    ApplyFeatureFlag(Bits, Feature, FeatureTable);
-  }
-
-  return Bits;
-}
-
 void SubtargetFeatures::print(raw_ostream &OS) const {
   for (auto &F : Features)
     OS << F << " ";