Move files in wtf/ to platform/wtf/ (Part 9).

third_party/WebKit/Source/wtf/text/ASCIIFastPath.h

-/*
- * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
- * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
-#ifndef ASCIIFastPath_h
-#define ASCIIFastPath_h
+#include "platform/wtf/text/ASCIIFastPath.h"
 
-#include "wtf/Alignment.h"
-#include "wtf/CPU.h"
-#include "wtf/StdLibExtras.h"
-#include "wtf/text/Unicode.h"
-#include <stdint.h>
-
-#if OS(MACOSX) && (CPU(X86) || CPU(X86_64))
-#include <emmintrin.h>
-#endif
-
-namespace WTF {
-
-// Assuming that a pointer is the size of a "machine word", then
-// uintptr_t is an integer type that is also a machine word.
-typedef uintptr_t MachineWord;
-const uintptr_t machineWordAlignmentMask = sizeof(MachineWord) - 1;
-
-inline bool isAlignedToMachineWord(const void* pointer) {
-  return !(reinterpret_cast<uintptr_t>(pointer) & machineWordAlignmentMask);
-}
-
-template <typename T>
-inline T* alignToMachineWord(T* pointer) {
-  return reinterpret_cast<T*>(reinterpret_cast<uintptr_t>(pointer) &
-                              ~machineWordAlignmentMask);
-}
-
-template <size_t size, typename CharacterType>
-struct NonASCIIMask;
-template <>
-struct NonASCIIMask<4, UChar> {
-  static inline uint32_t value() { return 0xFF80FF80U; }
-};
-template <>
-struct NonASCIIMask<4, LChar> {
-  static inline uint32_t value() { return 0x80808080U; }
-};
-template <>
-struct NonASCIIMask<8, UChar> {
-  static inline uint64_t value() { return 0xFF80FF80FF80FF80ULL; }
-};
-template <>
-struct NonASCIIMask<8, LChar> {
-  static inline uint64_t value() { return 0x8080808080808080ULL; }
-};
-
-template <typename CharacterType>
-inline bool isAllASCII(MachineWord word) {
-  return !(word & NonASCIIMask<sizeof(MachineWord), CharacterType>::value());
-}
-
-// Note: This function assume the input is likely all ASCII, and
-// does not leave early if it is not the case.
-template <typename CharacterType>
-inline bool charactersAreAllASCII(const CharacterType* characters,
-                                  size_t length) {
-  DCHECK_GT(length, 0u);
-  MachineWord allCharBits = 0;
-  const CharacterType* end = characters + length;
-
-  // Prologue: align the input.
-  while (!isAlignedToMachineWord(characters) && characters != end) {
-    allCharBits |= *characters;
-    ++characters;
-  }
-
-  // Compare the values of CPU word size.
-  const CharacterType* wordEnd = alignToMachineWord(end);
-  const size_t loopIncrement = sizeof(MachineWord) / sizeof(CharacterType);
-  while (characters < wordEnd) {
-    allCharBits |= *(reinterpret_cast_ptr<const MachineWord*>(characters));
-    characters += loopIncrement;
-  }
-
-  // Process the remaining bytes.
-  while (characters != end) {
-    allCharBits |= *characters;
-    ++characters;
-  }
-
-  MachineWord nonASCIIBitMask =
-      NonASCIIMask<sizeof(MachineWord), CharacterType>::value();
-  return !(allCharBits & nonASCIIBitMask);
-}
-
-inline void copyLCharsFromUCharSource(LChar* destination,
-                                      const UChar* source,
-                                      size_t length) {
-#if OS(MACOSX) && (CPU(X86) || CPU(X86_64))
-  const uintptr_t memoryAccessSize =
-      16;  // Memory accesses on 16 byte (128 bit) alignment
-  const uintptr_t memoryAccessMask = memoryAccessSize - 1;
-
-  size_t i = 0;
-  for (; i < length && !isAlignedTo<memoryAccessMask>(&source[i]); ++i) {
-    DCHECK(!(source[i] & 0xff00));
-    destination[i] = static_cast<LChar>(source[i]);
-  }
-
-  const uintptr_t sourceLoadSize =
-      32;  // Process 32 bytes (16 UChars) each iteration
-  const size_t ucharsPerLoop = sourceLoadSize / sizeof(UChar);
-  if (length > ucharsPerLoop) {
-    const size_t endLength = length - ucharsPerLoop + 1;
-    for (; i < endLength; i += ucharsPerLoop) {
-#if DCHECK_IS_ON()
-      for (unsigned checkIndex = 0; checkIndex < ucharsPerLoop; ++checkIndex)
-        DCHECK(!(source[i + checkIndex] & 0xff00));
-#endif
-      __m128i first8UChars =
-          _mm_load_si128(reinterpret_cast<const __m128i*>(&source[i]));
-      __m128i second8UChars =
-          _mm_load_si128(reinterpret_cast<const __m128i*>(&source[i + 8]));
-      __m128i packedChars = _mm_packus_epi16(first8UChars, second8UChars);
-      _mm_storeu_si128(reinterpret_cast<__m128i*>(&destination[i]),
-                       packedChars);
-    }
-  }
-
-  for (; i < length; ++i) {
-    DCHECK(!(source[i] & 0xff00));
-    destination[i] = static_cast<LChar>(source[i]);
-  }
-#elif COMPILER(GCC) && CPU(ARM_NEON) && \
-    !(CPU(BIG_ENDIAN) || CPU(MIDDLE_ENDIAN)) && defined(NDEBUG)
-  const LChar* const end = destination + length;
-  const uintptr_t memoryAccessSize = 8;
-
-  if (length >= (2 * memoryAccessSize) - 1) {
-    // Prefix: align dst on 64 bits.
-    const uintptr_t memoryAccessMask = memoryAccessSize - 1;
-    while (!isAlignedTo<memoryAccessMask>(destination))
-      *destination++ = static_cast<LChar>(*source++);
-
-    // Vector interleaved unpack, we only store the lower 8 bits.
-    const uintptr_t lengthLeft = end - destination;
-    const LChar* const simdEnd = end - (lengthLeft % memoryAccessSize);
-    do {
-      asm("vld2.8   { d0-d1 }, [%[SOURCE]] !\n\t"
-          "vst1.8   { d0 }, [%[DESTINATION],:64] !\n\t"
-          : [SOURCE] "+r"(source), [DESTINATION] "+r"(destination)
-          :
-          : "memory", "d0", "d1");
-    } while (destination != simdEnd);
-  }
-
-  while (destination != end)
-    *destination++ = static_cast<LChar>(*source++);
-#else
-  for (size_t i = 0; i < length; ++i) {
-    DCHECK(!(source[i] & 0xff00));
-    destination[i] = static_cast<LChar>(source[i]);
-  }
-#endif
-}
-
-}  // namespace WTF
-
-#endif  // ASCIIFastPath_h
+// The contents of this header was moved to platform/wtf as part of
+// WTF migration project. See the following post for details:
+// https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gYCAAJ