132 lines
4.3 KiB
C++
132 lines
4.3 KiB
C++
/*
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Copyright (c) 2010-2011, Intel Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef _MSC_VER
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#define _CRT_SECURE_NO_WARNINGS
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#define NOMINMAX
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#pragma warning (disable: 4244)
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#pragma warning (disable: 4305)
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#endif
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#include <stdio.h>
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#include <algorithm>
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#include "../timing.h"
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#include "noise_ispc.h"
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#include <string.h>
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using namespace ispc;
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extern void noise_serial(float x0, float y0, float x1, float y1,
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int width, int height, float output[]);
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/* Write a PPM image file with the image */
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static void
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writePPM(float *buf, int width, int height, const char *fn) {
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FILE *fp = fopen(fn, "wb");
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fprintf(fp, "P6\n");
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fprintf(fp, "%d %d\n", width, height);
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fprintf(fp, "255\n");
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for (int i = 0; i < width*height; ++i) {
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float v = buf[i] * 255.f;
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if (v < 0) v = 0;
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if (v > 255) v = 255;
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for (int j = 0; j < 3; ++j)
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fputc((char)v, fp);
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}
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fclose(fp);
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}
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int main(int argc, char *argv[]) {
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static unsigned int test_iterations[] = {3, 1};
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unsigned int width = 768;
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unsigned int height = 768;
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float x0 = -10;
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float x1 = 10;
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float y0 = -10;
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float y1 = 10;
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if (argc > 1) {
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if (strncmp(argv[1], "--scale=", 8) == 0) {
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float scale = atof(argv[1] + 8);
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width *= scale;
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height *= scale;
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}
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}
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if ((argc == 3) || (argc == 4)) {
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for (int i = 0; i < 2; i++) {
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test_iterations[i] = atoi(argv[argc - 2 + i]);
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}
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}
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float *buf = new float[width*height];
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//
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// Compute the image using the ispc implementation; report the minimum
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// time of three runs.
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//
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double minISPC = 1e30;
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for (int i = 0; i < test_iterations[0]; ++i) {
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reset_and_start_timer();
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noise_ispc(x0, y0, x1, y1, width, height, buf);
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double dt = get_elapsed_mcycles();
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printf("@time of ISPC run:\t\t\t[%.3f] million cycles\n", dt);
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minISPC = std::min(minISPC, dt);
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}
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printf("[noise ispc]:\t\t\t[%.3f] million cycles\n", minISPC);
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writePPM(buf, width, height, "noise-ispc.ppm");
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// Clear out the buffer
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for (unsigned int i = 0; i < width * height; ++i)
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buf[i] = 0;
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//
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// And run the serial implementation 3 times, again reporting the
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// minimum time.
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//
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double minSerial = 1e30;
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for (int i = 0; i < test_iterations[1]; ++i) {
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reset_and_start_timer();
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noise_serial(x0, y0, x1, y1, width, height, buf);
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double dt = get_elapsed_mcycles();
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printf("@time of serial run:\t\t\t[%.3f] million cycles\n", dt);
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minSerial = std::min(minSerial, dt);
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}
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printf("[noise serial]:\t\t\t[%.3f] million cycles\n", minSerial);
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writePPM(buf, width, height, "noise-serial.ppm");
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printf("\t\t\t\t(%.2fx speedup from ISPC)\n", minSerial/minISPC);
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return 0;
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}
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