minio/erasure/src/gf-vect-dot-prod-1tbl.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>		// for memset, memcmp
#include "erasure/tests.h"
#include "erasure-code.h"

//#define CACHED_TEST
#ifdef CACHED_TEST
// Cached test, loop many times over small dataset
# define TEST_SOURCES 10
# define TEST_LEN     8*1024
# define TEST_LOOPS   4000
# define TEST_TYPE_STR "_warm"
#else
# ifndef TEST_CUSTOM
// Uncached test.  Pull from large mem base.
#  define TEST_SOURCES 10
#  define GT_L3_CACHE  32*1024*1024	/* some number > last level cache */
#  define TEST_LEN     GT_L3_CACHE / TEST_SOURCES
#  define TEST_LOOPS   10
#  define TEST_TYPE_STR "_cold"
# else
#  define TEST_TYPE_STR "_cus"
#  ifndef TEST_LOOPS
#    define TEST_LOOPS 1000
#  endif
# endif
#endif

typedef unsigned char u8;

// Global GF(256) tables
u8 gff[256];
u8 gflog[256];
u8 gf_mul_table[256 * 256];

void mk_gf_field()
{
	int i;
	u8 s = 1;
	gflog[0] = 0;

	for (i = 0; i < 256; i++) {
		gff[i] = s;
		gflog[s] = i;
		s = (s << 1) ^ ((s & 0x80) ? 0x1d : 0);	// mult by GF{2}
	}
}

void mk_gf_mul_table(u8 * table)
{
	// Populate a single table with all multiply combinations for a fast,
	// single-table lookup of GF(2^8) multiply at the expense of memory.
	int i, j;
	for (i = 0; i < 256; i++)
		for (j = 0; j < 256; j++)
			table[i * 256 + j] = gf_mul(i, j);
}

void gf_vect_dot_prod_ref(int len, int vlen, u8 * v, u8 ** src, u8 * dest)
{
	int i, j;
	u8 s;
	for (i = 0; i < len; i++) {
		s = 0;
		for (j = 0; j < vlen; j++)
			s ^= gf_mul(src[j][i], v[j]);

		dest[i] = s;
	}
}

int main()
{
	int i, j, k;
	u8 s, vec[TEST_SOURCES], dest1[TEST_LEN], dest2[TEST_LEN];
	u8 *matrix[TEST_SOURCES];
	struct perf start, stop;

	mk_gf_field();
	mk_gf_mul_table(gf_mul_table);

	//generate random vector and matrix/data
	for (i = 0; i < TEST_SOURCES; i++) {
		vec[i] = rand();

		if (!(matrix[i] = malloc(TEST_LEN))) {
			fprintf(stderr, "Error failure\n\n");
			return -1;
		}
		for (j = 0; j < TEST_LEN; j++)
			matrix[i][j] = rand();

	}

	gf_vect_dot_prod_ref(TEST_LEN, TEST_SOURCES, vec, matrix, dest1);

	perf_start(&start);
	for (i = 0; i < TEST_LOOPS; i++)
		gf_vect_dot_prod_ref(TEST_LEN, TEST_SOURCES, vec, matrix, dest1);

	perf_stop(&stop);
	printf("gf_vect_dot_prod_2tbl" TEST_TYPE_STR ": ");
	perf_print(stop, start, (long long)TEST_LEN * (TEST_SOURCES + 1) * i);

	// Warm up mult tables
	for (i = 0; i < TEST_LEN; i++) {
		s = 0;
		for (j = 0; j < TEST_SOURCES; j++) {
			s ^= gf_mul_table[vec[j] * 256 + matrix[j][i]];
		}
		dest2[i] = s;
	}

	perf_start(&start);
	for (k = 0; k < TEST_LOOPS; k++) {
		for (i = 0; i < TEST_LEN; i++) {
			s = 0;
			for (j = 0; j < TEST_SOURCES; j++) {
				s ^= gf_mul_table[vec[j] * 256 + matrix[j][i]];
			}
			dest2[i] = s;
		}
	}
	perf_stop(&stop);
	printf("gf_vect_dot_prod_1tbl" TEST_TYPE_STR ": ");
	perf_print(stop, start, (long long)TEST_LEN * (TEST_SOURCES + 1) * k);

	// Compare with reference function
	if (0 != memcmp(dest1, dest2, TEST_LEN)) {
		printf("Error, different results!\n\n");
		return -1;
	}

	printf("Pass functional test\n");
	return 0;
}