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/*
* Copyright © 2019 Manuel Stoeckl
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <emmintrin.h> // sse
#include <pmmintrin.h> // sse2
#include <tmmintrin.h> // sse3
size_t run_interval_diff_sse3(const int diff_window_size,
const void *__restrict__ imod, void *__restrict__ ibase,
uint32_t *__restrict__ diff, size_t i, const size_t i_end)
{
const __m128i *__restrict__ mod = imod;
__m128i *__restrict__ base = ibase;
size_t dc = 0;
while (1) {
/* Loop: no changes */
uint32_t *ctrl_blocks = (uint32_t *)&diff[dc];
dc += 2;
int trailing_unchanged = 0;
for (; i < i_end; i++) {
__m128i b0 = _mm_load_si128(&base[2 * i]);
__m128i b1 = _mm_load_si128(&base[2 * i + 1]);
__m128i m0 = _mm_load_si128(&mod[2 * i]);
__m128i m1 = _mm_load_si128(&mod[2 * i + 1]);
/* pxor + ptest + branch could be faster, depending on
* compiler choices */
__m128i eq0 = _mm_cmpeq_epi32(m0, b0);
__m128i eq1 = _mm_cmpeq_epi32(m1, b1);
uint32_t mask = (uint32_t)_mm_movemask_epi8(eq0);
mask |= ((uint32_t)_mm_movemask_epi8(eq1)) << 16;
if (mask != 0xffffffff) {
_mm_storeu_si128(&base[2 * i], m0);
_mm_storeu_si128(&base[2 * i + 1], m1);
/* Write the changed bytes, starting at the
* first modified term, and set the unchanged
* counter. */
size_t ncom = (size_t)__builtin_ctz(~mask) >> 2;
union {
__m128i s[2];
uint32_t v[8];
} tmp;
tmp.s[0] = m0;
tmp.s[1] = m1;
for (size_t z = ncom; z < 8; z++) {
diff[dc++] = tmp.v[z];
}
trailing_unchanged = __builtin_clz(~mask) >> 2;
ctrl_blocks[0] = (uint32_t)(8 * i + ncom);
i++;
if (i >= i_end) {
/* Last block, hence will not enter copy
* loop */
ctrl_blocks[1] = (uint32_t)(8 * i);
dc += 2;
}
break;
}
}
if (i >= i_end) {
dc -= 2;
break;
}
/* Loop: until no changes for DIFF_WINDOW +/- 4 spaces */
for (; i < i_end; i++) {
__m128i b0 = _mm_load_si128(&base[2 * i]);
__m128i b1 = _mm_load_si128(&base[2 * i + 1]);
__m128i m0 = _mm_load_si128(&mod[2 * i]);
__m128i m1 = _mm_load_si128(&mod[2 * i + 1]);
__m128i eq0 = _mm_cmpeq_epi32(m0, b0);
__m128i eq1 = _mm_cmpeq_epi32(m1, b1);
uint32_t mask = (uint32_t)_mm_movemask_epi8(eq0);
mask |= ((uint32_t)_mm_movemask_epi8(eq1)) << 16;
bool clear = mask == 0xffffffff;
/* Because clz is undefined when mask=0, extend */
uint64_t ext_mask = ((uint64_t)mask) << 32;
int nleading = __builtin_clzll(~ext_mask);
trailing_unchanged = clear * (trailing_unchanged + 8) +
(!clear) * (nleading >> 2);
_mm_storeu_si128((__m128i *)&diff[dc], m0);
_mm_storeu_si128((__m128i *)&diff[dc + 4], m1);
dc += 8;
if (trailing_unchanged > diff_window_size) {
i++;
break;
}
_mm_storeu_si128(&base[2 * i], m0);
_mm_storeu_si128(&base[2 * i + 1], m1);
}
/* Write coda */
dc -= (size_t)trailing_unchanged;
ctrl_blocks[1] = (uint32_t)(8 * i - (size_t)trailing_unchanged);
if (i >= i_end) {
break;
}
}
return dc;
}
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