The Tor Browser / file comparison
comparison: intl/uconv/src/nsUTF8ToUnicodeSSE2.cpp
intl/uconv/src/nsUTF8ToUnicodeSSE2.cpp
- branch
- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
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| -1:000000000000 | 0:b75c8c6e84e4 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 // This file should only be compiled if you're on x86 or x86_64. Additionally, | |
| 6 // you'll need to compile this file with -msse2 if you're using gcc. | |
| 7 | |
| 8 #include <emmintrin.h> | |
| 9 #include "nscore.h" | |
| 10 | |
| 11 namespace mozilla { | |
| 12 namespace SSE2 { | |
| 13 | |
| 14 void | |
| 15 Convert_ascii_run(const char *&src, | |
| 16 char16_t *&dst, | |
| 17 int32_t len) | |
| 18 { | |
| 19 if (len > 15) { | |
| 20 __m128i in, out1, out2; | |
| 21 __m128d *outp1, *outp2; | |
| 22 __m128i zeroes; | |
| 23 uint32_t offset; | |
| 24 | |
| 25 // align input to 16 bytes | |
| 26 while ((NS_PTR_TO_UINT32(src) & 15) && len > 0) { | |
| 27 if (*src & 0x80U) | |
| 28 return; | |
| 29 *dst++ = (char16_t) *src++; | |
| 30 len--; | |
| 31 } | |
| 32 | |
| 33 zeroes = _mm_setzero_si128(); | |
| 34 | |
| 35 offset = NS_PTR_TO_UINT32(dst) & 15; | |
| 36 | |
| 37 // Note: all these inner loops have to break, not return; we need | |
| 38 // to let the single-char loop below catch any leftover | |
| 39 // byte-at-a-time ASCII chars, since this function must consume | |
| 40 // all available ASCII chars before it returns | |
| 41 | |
| 42 if (offset == 0) { | |
| 43 while (len > 15) { | |
| 44 in = _mm_load_si128((__m128i *) src); | |
| 45 if (_mm_movemask_epi8(in)) | |
| 46 break; | |
| 47 out1 = _mm_unpacklo_epi8(in, zeroes); | |
| 48 out2 = _mm_unpackhi_epi8(in, zeroes); | |
| 49 _mm_stream_si128((__m128i *) dst, out1); | |
| 50 _mm_stream_si128((__m128i *) (dst + 8), out2); | |
| 51 dst += 16; | |
| 52 src += 16; | |
| 53 len -= 16; | |
| 54 } | |
| 55 } else if (offset == 8) { | |
| 56 outp1 = (__m128d *) &out1; | |
| 57 outp2 = (__m128d *) &out2; | |
| 58 while (len > 15) { | |
| 59 in = _mm_load_si128((__m128i *) src); | |
| 60 if (_mm_movemask_epi8(in)) | |
| 61 break; | |
| 62 out1 = _mm_unpacklo_epi8(in, zeroes); | |
| 63 out2 = _mm_unpackhi_epi8(in, zeroes); | |
| 64 _mm_storel_epi64((__m128i *) dst, out1); | |
| 65 _mm_storel_epi64((__m128i *) (dst + 8), out2); | |
| 66 _mm_storeh_pd((double *) (dst + 4), *outp1); | |
| 67 _mm_storeh_pd((double *) (dst + 12), *outp2); | |
| 68 src += 16; | |
| 69 dst += 16; | |
| 70 len -= 16; | |
| 71 } | |
| 72 } else { | |
| 73 while (len > 15) { | |
| 74 in = _mm_load_si128((__m128i *) src); | |
| 75 if (_mm_movemask_epi8(in)) | |
| 76 break; | |
| 77 out1 = _mm_unpacklo_epi8(in, zeroes); | |
| 78 out2 = _mm_unpackhi_epi8(in, zeroes); | |
| 79 _mm_storeu_si128((__m128i *) dst, out1); | |
| 80 _mm_storeu_si128((__m128i *) (dst + 8), out2); | |
| 81 src += 16; | |
| 82 dst += 16; | |
| 83 len -= 16; | |
| 84 } | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 // finish off a byte at a time | |
| 89 | |
| 90 while (len-- > 0 && (*src & 0x80U) == 0) { | |
| 91 *dst++ = (char16_t) *src++; | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 } // namespace SSE2 | |
| 96 } // namespace mozilla |
