28 lines
982 B
C
28 lines
982 B
C
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#include "crypto_decode_256x2.h"
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#include <immintrin.h>
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#include <stdint.h>
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#define COPY _mm256_set_epi64x(0x0303030303030303,0x0202020202020202,0x0101010101010101,0x0000000000000000)
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#define MASK _mm256_set1_epi64x(0x8040201008040201)
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#define MASK2 _mm256_set1_epi64x(0x0101010101010101)
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void PQCLEAN_NTRULPR857_AVX2_crypto_decode_256x2(void *v, const unsigned char *s) {
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__m256i *r = v;
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int i;
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for (i = 0; i < 8; ++i) {
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/* bytes s0 s1 s2 s3 */
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__m256i x = _mm256_set1_epi32(*(int32_t *) s);
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/* s0 s1 s2 s3 s0 s1 s2 s3 s0 s1 s2 s3 s0 s1 s2 s3 s0 s1 s2 s3 s0 s1 s2 s3 s0 s1 s2 s3 s0 s1 s2 s3 */
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x = _mm256_shuffle_epi8(x, COPY);
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/* s0 s0 s0 s0 s0 s0 s0 s0 s1 s1 s1 s1 s1 s1 s1 s1 s2 s2 s2 s2 s2 s2 s2 s2 s3 s3 s3 s3 s3 s3 s3 s3 */
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x = _mm256_andnot_si256(x, MASK);
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x = _mm256_cmpeq_epi8(x, _mm256_setzero_si256());
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x &= MASK2;
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_mm256_storeu_si256(r, x);
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s += 4;
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r += 1;
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}
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}
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