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sse2.c
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sse2.c
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/*
* Copyright (c) 2016, Los Alamos National Security, LLC
* All rights reserved.
* Copyright 2016. Los Alamos National Security, LLC. This software was produced under U.S. Government contract DE-AC52-06NA25396 for Los Alamos National Laboratory (LANL), which is operated by Los Alamos National Security, LLC for the U.S. Department of Energy. The U.S. Government has rights to use, reproduce, and distribute this software. NEITHER THE GOVERNMENT NOR LOS ALAMOS NATIONAL SECURITY, LLC MAKES ANY WARRANTY, EXPRESS OR IMPLIED, OR ASSUMES ANY LIABILITY FOR THE USE OF THIS SOFTWARE. If software is modified to produce derivative works, such modified software should be clearly marked, so as not to confuse it with the version available from LANL.
* Additionally, redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
* 3. Neither the name of Los Alamos National Security, LLC, Los Alamos National Laboratory, LANL, the U.S. Government, nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY LOS ALAMOS NATIONAL SECURITY, LLC AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL LOS ALAMOS NATIONAL SECURITY, LLC OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <pmmintrin.h>
#define WORD (128/8)
#define OUT_GHOST 1
#define X_OUT_GHOST (((OUT_GHOST - 1)/WORD + 1) * WORD)
#define Y_OUT_GHOST OUT_GHOST
#define IN_GHOST (OUT_GHOST + 1)
#define X_IN_GHOST ((OUT_GHOST/WORD + 1) * WORD)
#define Y_IN_GHOST IN_GHOST
#define X_IN_GHOST_WORDS (X_IN_GHOST/WORD)
void *aligned_malloc(int size) {
char *mem = malloc(sizeof(void*) + size + WORD - 1);
void **ptr = (void**)(((uintptr_t)(mem + sizeof(void*) + WORD - 1)) & ~((uintptr_t)(WORD - 1)));
ptr[-1] = mem;
return ptr;
}
void aligned_free(void *ptr) {
free(((void**)ptr)[-1]);
}
unsigned *life (const unsigned height,
const unsigned width,
const unsigned * const initial,
const unsigned iters) {
const unsigned padded_height = height + 2 * Y_IN_GHOST;
const unsigned padded_width = width + 2 * X_IN_GHOST;
const unsigned width_words = width/WORD;
const unsigned padded_width_words = padded_width/WORD;
uint8_t *universe = (uint8_t*)aligned_malloc(padded_height * padded_width);
uint8_t *new = (uint8_t*)aligned_malloc(padded_height * padded_width);
for (unsigned y = Y_IN_GHOST; y < height + Y_IN_GHOST; y++) {
for (unsigned x = X_IN_GHOST; x < width + X_IN_GHOST; x++) {
universe[(y * padded_width) + x] = initial[(y - Y_IN_GHOST) * width + x - X_IN_GHOST];
}
}
for (unsigned i = 0; i < iters; i+= IN_GHOST) {
//Because we assume the width is a multiple of the size of a SSE register,
//we can use aligned loads and stores.
__m128i *universe_words = (__m128i*)universe;
for (unsigned y = 0; y < padded_height; y++) {
if (y < Y_IN_GHOST) {
for (unsigned x = 0; x < X_IN_GHOST_WORDS; x++) {
_mm_store_si128(universe_words + y * padded_width_words + x,
_mm_load_si128(universe_words + (y + height) * padded_width_words + x + width_words));
}
for (unsigned x = X_IN_GHOST_WORDS; x < width_words + X_IN_GHOST_WORDS; x++) {
_mm_store_si128(universe_words + y * padded_width_words + x,
_mm_load_si128(universe_words + (y + height) * padded_width_words + x));
}
for (unsigned x = width_words + X_IN_GHOST_WORDS ; x < padded_width_words; x++) {
_mm_store_si128(universe_words + y * padded_width_words + x,
_mm_load_si128(universe_words + (y + height) * padded_width_words + x - width_words));
}
} else if (y < height + Y_IN_GHOST) {
for (unsigned x = 0; x < X_IN_GHOST_WORDS; x++) {
_mm_store_si128(universe_words + y * padded_width_words + x,
_mm_load_si128(universe_words + y * padded_width_words + x + width_words));
}
for (unsigned x = width_words + X_IN_GHOST_WORDS ; x < padded_width_words; x++) {
_mm_store_si128(universe_words + y * padded_width_words + x,
_mm_load_si128(universe_words + y * padded_width_words + x - width_words));
}
} else {
for (unsigned x = 0; x < X_IN_GHOST_WORDS; x++) {
_mm_store_si128(universe_words + y * padded_width_words + x,
_mm_load_si128(universe_words + (y - height) * padded_width_words + x + width_words));
}
for (unsigned x = X_IN_GHOST_WORDS; x < width_words + X_IN_GHOST_WORDS; x++) {
_mm_store_si128(universe_words + y * padded_width_words + x,
_mm_load_si128(universe_words + (y - height) * padded_width_words + x));
}
for (unsigned x = width_words + X_IN_GHOST_WORDS ; x < padded_width_words; x++) {
_mm_store_si128(universe_words + y * padded_width_words + x,
_mm_load_si128(universe_words + (y - height) * padded_width_words + x - width_words));
}
}
}
for (unsigned j = 0; j < IN_GHOST & j + i < iters; j++) {
//Set up a vector of ones
const __m128i ones = _mm_set_epi8(1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1);
//Set up a vector of twos
const __m128i twos = _mm_slli_epi32(ones, 1);
//Set up a vector of threes
const __m128i threes = _mm_or_si128(ones, twos);
for (unsigned y = (Y_IN_GHOST - Y_OUT_GHOST); y < height + Y_IN_GHOST + Y_OUT_GHOST; y++) {
for (unsigned x = (X_IN_GHOST - X_OUT_GHOST); x + WORD <= width + X_IN_GHOST + X_OUT_GHOST; x += WORD) {
__m128i n;
__m128i alive;
uint8_t *u = universe + (y - 1) * padded_width + x - 1;
//This is an unaligned load
n = _mm_lddqu_si128((__m128i*)u);
n = _mm_add_epi8(_mm_load_si128((__m128i*)(u + 1)), n);
n = _mm_add_epi8(_mm_lddqu_si128((__m128i*)(u + 2)), n);
u += padded_width;
n = _mm_add_epi8(_mm_lddqu_si128((__m128i*)u), n);
//This is an aligned load
alive = _mm_load_si128((__m128i*)(u + 1));
n = _mm_add_epi8(_mm_lddqu_si128((__m128i*)(u + 2)), n);
u += padded_width;
n = _mm_add_epi8(_mm_lddqu_si128((__m128i*)u), n);
n = _mm_add_epi8(_mm_load_si128((__m128i*)(u + 1)), n);
n = _mm_add_epi8(_mm_lddqu_si128((__m128i*)(u + 2)), n);
//The operation we are performing here is the same, but it looks
//very different when written in SIMD instructions
_mm_store_si128((__m128i*)(new + y * padded_width + x),
_mm_or_si128(
//We need to and with the ones vector here because the result of
//comparison is either 0xFF or 0, and we need 1 or 0.
_mm_and_si128(ones, _mm_cmpeq_epi8(n, threes)),
_mm_and_si128(alive, _mm_cmpeq_epi8(n, twos))));
}
}
uint8_t *tmp = universe;
universe = new;
new = tmp;
}
}
unsigned *out = (unsigned*)malloc(sizeof(unsigned) * height * width);
for (unsigned y = Y_IN_GHOST; y < height + Y_IN_GHOST; y++) {
for (unsigned x = X_IN_GHOST; x < width + X_IN_GHOST; x++) {
out[(y - Y_IN_GHOST) * width + x - X_IN_GHOST] = universe[(y * padded_width) + x];
}
}
aligned_free(new);
aligned_free(universe);
return out;
}