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49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
static inline __m128i
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enc_reshuffle (__m128i in)
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{
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// Input, bytes MSB to LSB:
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// 0 0 0 0 l k j i h g f e d c b a
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in = _mm_shuffle_epi8(in, _mm_set_epi8(
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10, 11, 9, 10,
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7, 8, 6, 7,
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4, 5, 3, 4,
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1, 2, 0, 1));
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// in, bytes MSB to LSB:
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// k l j k
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// h i g h
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// e f d e
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// b c a b
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const __m128i t0 = _mm_and_si128(in, _mm_set1_epi32(0x0FC0FC00));
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// bits, upper case are most significant bits, lower case are least significant bits
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// 0000kkkk LL000000 JJJJJJ00 00000000
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// 0000hhhh II000000 GGGGGG00 00000000
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// 0000eeee FF000000 DDDDDD00 00000000
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// 0000bbbb CC000000 AAAAAA00 00000000
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const __m128i t1 = _mm_mulhi_epu16(t0, _mm_set1_epi32(0x04000040));
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// 00000000 00kkkkLL 00000000 00JJJJJJ
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// 00000000 00hhhhII 00000000 00GGGGGG
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// 00000000 00eeeeFF 00000000 00DDDDDD
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// 00000000 00bbbbCC 00000000 00AAAAAA
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const __m128i t2 = _mm_and_si128(in, _mm_set1_epi32(0x003F03F0));
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// 00000000 00llllll 000000jj KKKK0000
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// 00000000 00iiiiii 000000gg HHHH0000
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// 00000000 00ffffff 000000dd EEEE0000
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// 00000000 00cccccc 000000aa BBBB0000
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const __m128i t3 = _mm_mullo_epi16(t2, _mm_set1_epi32(0x01000010));
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// 00llllll 00000000 00jjKKKK 00000000
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// 00iiiiii 00000000 00ggHHHH 00000000
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// 00ffffff 00000000 00ddEEEE 00000000
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// 00cccccc 00000000 00aaBBBB 00000000
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return _mm_or_si128(t1, t3);
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// 00llllll 00kkkkLL 00jjKKKK 00JJJJJJ
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// 00iiiiii 00hhhhII 00ggHHHH 00GGGGGG
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// 00ffffff 00eeeeFF 00ddEEEE 00DDDDDD
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// 00cccccc 00bbbbCC 00aaBBBB 00AAAAAA
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}
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