зеркало из https://github.com/mozilla/gecko-dev.git
55 строки
1.8 KiB
C
55 строки
1.8 KiB
C
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdint.h>
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namespace mozilla {
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inline bool IsASCII(char16_t aChar) {
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return (aChar & 0xFF80) == 0;
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}
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/**
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* Provides a pointer before or equal to |aPtr| that is is suitably aligned.
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*/
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inline const char16_t* aligned(const char16_t* aPtr, const uintptr_t aMask)
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{
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return reinterpret_cast<const char16_t*>(
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reinterpret_cast<const uintptr_t>(aPtr) & ~aMask);
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}
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/**
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* Structures for word-sized vectorization of ASCII checking for UTF-16
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* strings.
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*/
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template<size_t size> struct NonASCIIParameters;
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template<> struct NonASCIIParameters<4> {
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static inline size_t mask() { return 0xff80ff80; }
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static inline uintptr_t alignMask() { return 0x3; }
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static inline size_t numUnicharsPerWord() { return 2; }
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};
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template<> struct NonASCIIParameters<8> {
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static inline size_t mask() {
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static const uint64_t maskAsUint64 = UINT64_C(0xff80ff80ff80ff80);
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// We have to explicitly cast this 64-bit value to a size_t, or else
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// compilers for 32-bit platforms will warn about it being too large to fit
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// in the size_t return type. (Fortunately, this code isn't actually
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// invoked on 32-bit platforms -- they'll use the <4> specialization above.
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// So it is, in fact, OK that this value is too large for a 32-bit size_t.)
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return (size_t)maskAsUint64;
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}
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static inline uintptr_t alignMask() { return 0x7; }
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static inline size_t numUnicharsPerWord() { return 4; }
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};
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namespace SSE2 {
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int32_t FirstNonASCII(const char16_t* aBegin, const char16_t* aEnd);
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} // namespace SSE2
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} // namespace mozilla
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