Created
October 12, 2018 20:39
-
-
Save terhechte/1b7a4b1c4bc1eaa5826014379ad79c4c to your computer and use it in GitHub Desktop.
C Implementation of benchmark test
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#include <stdlib.h> | |
#include <stdio.h> | |
// We're using int64_t as `usize` and `Int` in Rust / Swift also have 8byte | |
int64_t* resize_image(int64_t* image, int64_t size, int64_t width, int64_t scale, int64_t* rsize) { | |
int64_t *result = malloc(sizeof(int64_t) * (size / scale)); | |
int64_t pos = 0; | |
for (int64_t i=0; i<size; i+=width) { | |
for (int64_t i2=i; i2<(i + width); i2+=scale) { | |
int64_t sum = 0; | |
for (int64_t i3=i2; i3<(i2 + scale); i3+=1) { | |
sum += image[i3]; | |
} | |
result[pos++] = sum / scale; | |
} | |
} | |
*rsize = pos / sizeof(int64_t); | |
return result; | |
} | |
int64_t* generate(int64_t* size) { | |
const int64_t count = 200000; | |
int64_t image[] = { | |
1, 0, 0, 4, 4, 0, 0, 1, | |
0, 0, 0, 9, 9, 0, 0, 0, | |
0, 0, 0, 9, 9, 0, 0, 0, | |
4, 9, 9, 9, 9, 9, 9, 4, | |
4, 9, 9, 9, 9, 9, 9, 4, | |
0, 0, 0, 9, 9, 0, 0, 0, | |
0, 0, 0, 9, 9, 0, 0, 0, | |
1, 0, 0, 4, 4, 0, 0, 1, | |
}; | |
int64_t* array = malloc(sizeof(int64_t) * count * sizeof(image)); | |
int64_t pos = 0; | |
for (int64_t i=0; i<count; i++) { | |
for (int64_t i=0; i<sizeof(image); i+=1) { | |
array[pos++] = image[i]; | |
} | |
} | |
*size = (count * sizeof(image)); | |
return array; | |
} | |
int main(int argc, const char * argv[]) { | |
int64_t image_size = 0; | |
int64_t* image = generate(&image_size); | |
int64_t result1_size, result2_size, result3_size; | |
int64_t *result1 = resize_image(image, image_size, 8, 2, &result1_size); | |
int64_t *result2 = resize_image(image, image_size, 32, 8, &result2_size); | |
int64_t *result3 = resize_image(image, image_size, 16, 4, &result3_size); | |
free(result1); | |
free(result2); | |
free(result3); | |
printf("%lli %lli %lli\n", result1_size, result2_size, result3_size); | |
free(image); | |
return 0; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment