mirror of
https://github.com/henrydcase/pqc.git
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66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
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#include "crypto_decode_857x3.h"
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#include <immintrin.h>
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#define uint8 uint8_t
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#define p 857
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#define loops 7
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#define overshoot 10
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void PQCLEAN_SNTRUP857_AVX2_crypto_decode_857x3(void *v, const unsigned char *s) {
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uint8 *f = v;
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int loop;
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uint8 *nextf = f + 128 - 4 * overshoot;
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const unsigned char *nexts = s + 32 - overshoot;
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for (loop = loops; loop > 0; --loop) {
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__m256i s0 = _mm256_loadu_si256((const __m256i *) s);
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s = nexts;
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nexts += 32;
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__m256i s1 = _mm256_srli_epi16(s0 & _mm256_set1_epi8(-16), 4);
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s0 &= _mm256_set1_epi8(15);
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__m256i a0 = _mm256_unpacklo_epi8(s0, s1);
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/* 0 0>>4 1 1>>4 2 2>>4 3 3>>4 4 4>>4 5 5>>4 6 6>>4 7 7>>4 */
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/* 16 16>>4 ... */
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__m256i a1 = _mm256_unpackhi_epi8(s0, s1);
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/* 8 8>>4 9 9>>4 10 10>>4 ... */
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/* 24 24>>4 ... */
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__m256i a2 = _mm256_srli_epi16(a0 & _mm256_set1_epi8(12), 2);
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__m256i a3 = _mm256_srli_epi16(a1 & _mm256_set1_epi8(12), 2);
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a0 &= _mm256_set1_epi8(3);
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a1 &= _mm256_set1_epi8(3);
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__m256i b0 = _mm256_unpacklo_epi8(a0, a2);
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/* 0 0>>2 0>>4 0>>6 1 1>>2 1>>4 1>>6 */
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/* 2 2>>2 2>>4 2>>6 3 3>>2 3>>4 3>.6 */
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/* 16 16>>2 16>>4 16>>6 ... */
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__m256i b2 = _mm256_unpackhi_epi8(a0, a2);
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/* 4 4>>2 ... */
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__m256i b1 = _mm256_unpacklo_epi8(a1, a3);
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/* 8 8>>2 ... */
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__m256i b3 = _mm256_unpackhi_epi8(a1, a3);
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/* 12 12>>2 ... */
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__m256i f0 = _mm256_permute2x128_si256(b0, b2, 0x20);
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__m256i f2 = _mm256_permute2x128_si256(b0, b2, 0x31);
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__m256i f1 = _mm256_permute2x128_si256(b1, b3, 0x20);
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__m256i f3 = _mm256_permute2x128_si256(b1, b3, 0x31);
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f0 = _mm256_add_epi8(f0, _mm256_set1_epi8(-1));
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f1 = _mm256_add_epi8(f1, _mm256_set1_epi8(-1));
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f2 = _mm256_add_epi8(f2, _mm256_set1_epi8(-1));
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f3 = _mm256_add_epi8(f3, _mm256_set1_epi8(-1));
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_mm256_storeu_si256((__m256i *) (f + 0), f0);
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_mm256_storeu_si256((__m256i *) (f + 32), f1);
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_mm256_storeu_si256((__m256i *) (f + 64), f2);
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_mm256_storeu_si256((__m256i *) (f + 96), f3);
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f = nextf;
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nextf += 128;
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}
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*f = ((uint8)(*s & 3)) - 1;
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}
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