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if (bytes > 0) {
__m128i x_0, x_1, x_2, x_3;
__m128i t_1;
const __m128i rot16 =
_mm_set_epi8(13, 12, 15, 14, 9, 8, 11, 10, 5, 4, 7, 6, 1, 0, 3, 2);
const __m128i rot8 =
_mm_set_epi8(14, 13, 12, 15, 10, 9, 8, 11, 6, 5, 4, 7, 2, 1, 0, 3);
uint8_t partialblock[64];
unsigned int i;
x_0 = _mm_loadu_si128((__m128i*) (x + 0));
x_1 = _mm_loadu_si128((__m128i*) (x + 4));
x_2 = _mm_loadu_si128((__m128i*) (x + 8));
x_3 = _mm_loadu_si128((__m128i*) (x + 12));
for (i = 0; i < ROUNDS; i += 2) {
x_0 = _mm_add_epi32(x_0, x_1);
x_3 = _mm_xor_si128(x_3, x_0);
x_3 = _mm_shuffle_epi8(x_3, rot16);
x_2 = _mm_add_epi32(x_2, x_3);
x_1 = _mm_xor_si128(x_1, x_2);
t_1 = x_1;
x_1 = _mm_slli_epi32(x_1, 12);
t_1 = _mm_srli_epi32(t_1, 20);
x_1 = _mm_xor_si128(x_1, t_1);
x_0 = _mm_add_epi32(x_0, x_1);
x_3 = _mm_xor_si128(x_3, x_0);
x_0 = _mm_shuffle_epi32(x_0, 0x93);
x_3 = _mm_shuffle_epi8(x_3, rot8);
x_2 = _mm_add_epi32(x_2, x_3);
x_3 = _mm_shuffle_epi32(x_3, 0x4e);
x_1 = _mm_xor_si128(x_1, x_2);
x_2 = _mm_shuffle_epi32(x_2, 0x39);
t_1 = x_1;
x_1 = _mm_slli_epi32(x_1, 7);
t_1 = _mm_srli_epi32(t_1, 25);
x_1 = _mm_xor_si128(x_1, t_1);
x_0 = _mm_add_epi32(x_0, x_1);
x_3 = _mm_xor_si128(x_3, x_0);
x_3 = _mm_shuffle_epi8(x_3, rot16);
x_2 = _mm_add_epi32(x_2, x_3);
x_1 = _mm_xor_si128(x_1, x_2);
t_1 = x_1;
x_1 = _mm_slli_epi32(x_1, 12);
t_1 = _mm_srli_epi32(t_1, 20);
x_1 = _mm_xor_si128(x_1, t_1);
x_0 = _mm_add_epi32(x_0, x_1);
x_3 = _mm_xor_si128(x_3, x_0);
x_0 = _mm_shuffle_epi32(x_0, 0x39);
x_3 = _mm_shuffle_epi8(x_3, rot8);
x_2 = _mm_add_epi32(x_2, x_3);
x_3 = _mm_shuffle_epi32(x_3, 0x4e);
x_1 = _mm_xor_si128(x_1, x_2);
x_2 = _mm_shuffle_epi32(x_2, 0x93);
t_1 = x_1;
x_1 = _mm_slli_epi32(x_1, 7);
t_1 = _mm_srli_epi32(t_1, 25);
x_1 = _mm_xor_si128(x_1, t_1);
}
x_0 = _mm_add_epi32(x_0, _mm_loadu_si128((__m128i*) (x + 0)));
x_1 = _mm_add_epi32(x_1, _mm_loadu_si128((__m128i*) (x + 4)));
x_2 = _mm_add_epi32(x_2, _mm_loadu_si128((__m128i*) (x + 8)));
x_3 = _mm_add_epi32(x_3, _mm_loadu_si128((__m128i*) (x + 12)));
_mm_storeu_si128((__m128i*) (partialblock + 0), x_0);
_mm_storeu_si128((__m128i*) (partialblock + 16), x_1);
_mm_storeu_si128((__m128i*) (partialblock + 32), x_2);
_mm_storeu_si128((__m128i*) (partialblock + 48), x_3);
for (i = 0; i < bytes; i++) {
c[i] = m[i] ^ partialblock[i];
}
sodium_memzero(partialblock, sizeof partialblock);
}
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