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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
}
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