1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/intl/uconv/src/nsUTF8ToUnicodeSSE2.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,96 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +// This file should only be compiled if you're on x86 or x86_64. Additionally,
1.9 +// you'll need to compile this file with -msse2 if you're using gcc.
1.10 +
1.11 +#include <emmintrin.h>
1.12 +#include "nscore.h"
1.13 +
1.14 +namespace mozilla {
1.15 +namespace SSE2 {
1.16 +
1.17 +void
1.18 +Convert_ascii_run(const char *&src,
1.19 + char16_t *&dst,
1.20 + int32_t len)
1.21 +{
1.22 + if (len > 15) {
1.23 + __m128i in, out1, out2;
1.24 + __m128d *outp1, *outp2;
1.25 + __m128i zeroes;
1.26 + uint32_t offset;
1.27 +
1.28 + // align input to 16 bytes
1.29 + while ((NS_PTR_TO_UINT32(src) & 15) && len > 0) {
1.30 + if (*src & 0x80U)
1.31 + return;
1.32 + *dst++ = (char16_t) *src++;
1.33 + len--;
1.34 + }
1.35 +
1.36 + zeroes = _mm_setzero_si128();
1.37 +
1.38 + offset = NS_PTR_TO_UINT32(dst) & 15;
1.39 +
1.40 + // Note: all these inner loops have to break, not return; we need
1.41 + // to let the single-char loop below catch any leftover
1.42 + // byte-at-a-time ASCII chars, since this function must consume
1.43 + // all available ASCII chars before it returns
1.44 +
1.45 + if (offset == 0) {
1.46 + while (len > 15) {
1.47 + in = _mm_load_si128((__m128i *) src);
1.48 + if (_mm_movemask_epi8(in))
1.49 + break;
1.50 + out1 = _mm_unpacklo_epi8(in, zeroes);
1.51 + out2 = _mm_unpackhi_epi8(in, zeroes);
1.52 + _mm_stream_si128((__m128i *) dst, out1);
1.53 + _mm_stream_si128((__m128i *) (dst + 8), out2);
1.54 + dst += 16;
1.55 + src += 16;
1.56 + len -= 16;
1.57 + }
1.58 + } else if (offset == 8) {
1.59 + outp1 = (__m128d *) &out1;
1.60 + outp2 = (__m128d *) &out2;
1.61 + while (len > 15) {
1.62 + in = _mm_load_si128((__m128i *) src);
1.63 + if (_mm_movemask_epi8(in))
1.64 + break;
1.65 + out1 = _mm_unpacklo_epi8(in, zeroes);
1.66 + out2 = _mm_unpackhi_epi8(in, zeroes);
1.67 + _mm_storel_epi64((__m128i *) dst, out1);
1.68 + _mm_storel_epi64((__m128i *) (dst + 8), out2);
1.69 + _mm_storeh_pd((double *) (dst + 4), *outp1);
1.70 + _mm_storeh_pd((double *) (dst + 12), *outp2);
1.71 + src += 16;
1.72 + dst += 16;
1.73 + len -= 16;
1.74 + }
1.75 + } else {
1.76 + while (len > 15) {
1.77 + in = _mm_load_si128((__m128i *) src);
1.78 + if (_mm_movemask_epi8(in))
1.79 + break;
1.80 + out1 = _mm_unpacklo_epi8(in, zeroes);
1.81 + out2 = _mm_unpackhi_epi8(in, zeroes);
1.82 + _mm_storeu_si128((__m128i *) dst, out1);
1.83 + _mm_storeu_si128((__m128i *) (dst + 8), out2);
1.84 + src += 16;
1.85 + dst += 16;
1.86 + len -= 16;
1.87 + }
1.88 + }
1.89 + }
1.90 +
1.91 + // finish off a byte at a time
1.92 +
1.93 + while (len-- > 0 && (*src & 0x80U) == 0) {
1.94 + *dst++ = (char16_t) *src++;
1.95 + }
1.96 +}
1.97 +
1.98 +} // namespace SSE2
1.99 +} // namespace mozilla
