diff options
Diffstat (limited to '')
-rw-r--r-- | src/third-party/base64/lib/arch/avx2/dec_reshuffle.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/third-party/base64/lib/arch/avx2/dec_reshuffle.c b/src/third-party/base64/lib/arch/avx2/dec_reshuffle.c new file mode 100644 index 0000000..f351809 --- /dev/null +++ b/src/third-party/base64/lib/arch/avx2/dec_reshuffle.c @@ -0,0 +1,34 @@ +static inline __m256i +dec_reshuffle (const __m256i in) +{ + // in, lower lane, bits, upper case are most significant bits, lower + // case are least significant bits: + // 00llllll 00kkkkLL 00jjKKKK 00JJJJJJ + // 00iiiiii 00hhhhII 00ggHHHH 00GGGGGG + // 00ffffff 00eeeeFF 00ddEEEE 00DDDDDD + // 00cccccc 00bbbbCC 00aaBBBB 00AAAAAA + + const __m256i merge_ab_and_bc = _mm256_maddubs_epi16(in, _mm256_set1_epi32(0x01400140)); + // 0000kkkk LLllllll 0000JJJJ JJjjKKKK + // 0000hhhh IIiiiiii 0000GGGG GGggHHHH + // 0000eeee FFffffff 0000DDDD DDddEEEE + // 0000bbbb CCcccccc 0000AAAA AAaaBBBB + + __m256i out = _mm256_madd_epi16(merge_ab_and_bc, _mm256_set1_epi32(0x00011000)); + // 00000000 JJJJJJjj KKKKkkkk LLllllll + // 00000000 GGGGGGgg HHHHhhhh IIiiiiii + // 00000000 DDDDDDdd EEEEeeee FFffffff + // 00000000 AAAAAAaa BBBBbbbb CCcccccc + + // Pack bytes together in each lane: + out = _mm256_shuffle_epi8(out, _mm256_setr_epi8( + 2, 1, 0, 6, 5, 4, 10, 9, 8, 14, 13, 12, -1, -1, -1, -1, + 2, 1, 0, 6, 5, 4, 10, 9, 8, 14, 13, 12, -1, -1, -1, -1)); + // 00000000 00000000 00000000 00000000 + // LLllllll KKKKkkkk JJJJJJjj IIiiiiii + // HHHHhhhh GGGGGGgg FFffffff EEEEeeee + // DDDDDDdd CCcccccc BBBBbbbb AAAAAAaa + + // Pack lanes: + return _mm256_permutevar8x32_epi32(out, _mm256_setr_epi32(0, 1, 2, 4, 5, 6, -1, -1)); +} |