forked from mirrors/gecko-dev
7df7d42bf2
Only provide forward declaration to the generic code. Differential Revision: https://phabricator.services.mozilla.com/D175742
65 lines
2 KiB
C++
65 lines
2 KiB
C++
/* -*- 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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#ifndef nsTextFragmentGeneric_h__
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#define nsTextFragmentGeneric_h__
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#include "nsTextFragmentGenericFwd.h"
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#include "nscore.h"
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#include "nsTextFragmentImpl.h"
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#include <algorithm>
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namespace mozilla {
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template <class Arch>
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int32_t FirstNon8Bit(const char16_t* str, const char16_t* end) {
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const uint32_t numUnicharsPerVector = xsimd::batch<int16_t, Arch>::size;
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using p = Non8BitParameters<sizeof(size_t)>;
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const size_t mask = p::mask();
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const uint32_t numUnicharsPerWord = p::numUnicharsPerWord();
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const int32_t len = end - str;
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int32_t i = 0;
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// Align ourselves to the Arch boundary
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int32_t alignLen = std::min(
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len, int32_t(((-NS_PTR_TO_INT32(str)) & (Arch::alignment() - 1)) /
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sizeof(char16_t)));
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for (; i < alignLen; i++) {
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if (str[i] > 255) return i;
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}
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// Check one batch at a time.
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const int32_t vectWalkEnd =
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((len - i) / numUnicharsPerVector) * numUnicharsPerVector;
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const uint16_t shortMask = 0xff00;
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xsimd::batch<int16_t, Arch> vectmask(static_cast<int16_t>(shortMask));
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for (; i < vectWalkEnd; i += numUnicharsPerVector) {
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const auto vect = xsimd::batch<int16_t, Arch>::load_aligned(str + i);
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if (xsimd::any((vect & vectmask) != 0)) return i;
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}
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// Check one word at a time.
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const int32_t wordWalkEnd =
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((len - i) / numUnicharsPerWord) * numUnicharsPerWord;
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for (; i < wordWalkEnd; i += numUnicharsPerWord) {
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const size_t word = *reinterpret_cast<const size_t*>(str + i);
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if (word & mask) return i;
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}
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// Take care of the remainder one character at a time.
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for (; i < len; i++) {
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if (str[i] > 255) {
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return i;
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}
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}
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return -1;
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}
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} // namespace mozilla
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#endif
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