diff options
Diffstat (limited to 'src/third-party/base64/lib/arch/ssse3/enc_reshuffle.c')
-rw-r--r-- | src/third-party/base64/lib/arch/ssse3/enc_reshuffle.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/third-party/base64/lib/arch/ssse3/enc_reshuffle.c b/src/third-party/base64/lib/arch/ssse3/enc_reshuffle.c new file mode 100644 index 0000000..b738591 --- /dev/null +++ b/src/third-party/base64/lib/arch/ssse3/enc_reshuffle.c @@ -0,0 +1,48 @@ +static inline __m128i +enc_reshuffle (__m128i in) +{ + // Input, bytes MSB to LSB: + // 0 0 0 0 l k j i h g f e d c b a + + in = _mm_shuffle_epi8(in, _mm_set_epi8( + 10, 11, 9, 10, + 7, 8, 6, 7, + 4, 5, 3, 4, + 1, 2, 0, 1)); + // in, bytes MSB to LSB: + // k l j k + // h i g h + // e f d e + // b c a b + + const __m128i t0 = _mm_and_si128(in, _mm_set1_epi32(0x0FC0FC00)); + // bits, upper case are most significant bits, lower case are least significant bits + // 0000kkkk LL000000 JJJJJJ00 00000000 + // 0000hhhh II000000 GGGGGG00 00000000 + // 0000eeee FF000000 DDDDDD00 00000000 + // 0000bbbb CC000000 AAAAAA00 00000000 + + const __m128i t1 = _mm_mulhi_epu16(t0, _mm_set1_epi32(0x04000040)); + // 00000000 00kkkkLL 00000000 00JJJJJJ + // 00000000 00hhhhII 00000000 00GGGGGG + // 00000000 00eeeeFF 00000000 00DDDDDD + // 00000000 00bbbbCC 00000000 00AAAAAA + + const __m128i t2 = _mm_and_si128(in, _mm_set1_epi32(0x003F03F0)); + // 00000000 00llllll 000000jj KKKK0000 + // 00000000 00iiiiii 000000gg HHHH0000 + // 00000000 00ffffff 000000dd EEEE0000 + // 00000000 00cccccc 000000aa BBBB0000 + + const __m128i t3 = _mm_mullo_epi16(t2, _mm_set1_epi32(0x01000010)); + // 00llllll 00000000 00jjKKKK 00000000 + // 00iiiiii 00000000 00ggHHHH 00000000 + // 00ffffff 00000000 00ddEEEE 00000000 + // 00cccccc 00000000 00aaBBBB 00000000 + + return _mm_or_si128(t1, t3); + // 00llllll 00kkkkLL 00jjKKKK 00JJJJJJ + // 00iiiiii 00hhhhII 00ggHHHH 00GGGGGG + // 00ffffff 00eeeeFF 00ddEEEE 00DDDDDD + // 00cccccc 00bbbbCC 00aaBBBB 00AAAAAA +} |