/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
template <class Arch>
int32_t FirstNon8Bit(const char16_t* str, const char16_t* end) { const uint32_t numUnicharsPerVector = xsimd::batch<int16_t, Arch>::size; using p = Non8BitParameters<sizeof(size_t)>; const size_t mask = p::mask(); const uint32_t numUnicharsPerWord = p::numUnicharsPerWord(); const int32_t len = end - str;
int32_t i = 0;
// Align ourselves to the Arch boundary
int32_t alignLen = std::min(
len, int32_t(((-NS_PTR_TO_INT32(str)) & (Arch::alignment() - 1)) / sizeof(char16_t))); for (; i < alignLen; i++) { if (str[i] > 255) return i;
}
// Check one batch at a time. const int32_t vectWalkEnd =
((len - i) / numUnicharsPerVector) * numUnicharsPerVector; const uint16_t shortMask = 0xff00;
xsimd::batch<int16_t, Arch> vectmask(static_cast<int16_t>(shortMask)); for (; i < vectWalkEnd; i += numUnicharsPerVector) { constauto vect = xsimd::batch<int16_t, Arch>::load_aligned(str + i); if (xsimd::any((vect & vectmask) != 0)) return i;
}
// Check one word at a time. const int32_t wordWalkEnd =
((len - i) / numUnicharsPerWord) * numUnicharsPerWord; for (; i < wordWalkEnd; i += numUnicharsPerWord) { const size_t word = *reinterpret_cast<const size_t*>(str + i); if (word & mask) return i;
}
// Take care of the remainder one character at a time. for (; i < len; i++) { if (str[i] > 255) { return i;
}
}
return -1;
}
} // namespace mozilla
#endif
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