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Diffstat (limited to 'src/erasure-code/jerasure/gf-complete/examples/gf_example_6.c')
-rw-r--r-- | src/erasure-code/jerasure/gf-complete/examples/gf_example_6.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/erasure-code/jerasure/gf-complete/examples/gf_example_6.c b/src/erasure-code/jerasure/gf-complete/examples/gf_example_6.c new file mode 100644 index 00000000..800a35ff --- /dev/null +++ b/src/erasure-code/jerasure/gf-complete/examples/gf_example_6.c @@ -0,0 +1,84 @@ +/* + * GF-Complete: A Comprehensive Open Source Library for Galois Field Arithmetic + * James S. Plank, Ethan L. Miller, Kevin M. Greenan, + * Benjamin A. Arnold, John A. Burnum, Adam W. Disney, Allen C. McBride. + * + * gf_example_6.c + * + * Demonstrating altmap and extract_word + */ + +#include <stdio.h> +#include <getopt.h> +#include <stdint.h> +#include <string.h> +#include <stdlib.h> +#include <time.h> + +#include "gf_complete.h" +#include "gf_rand.h" + +void usage(char *s) +{ + fprintf(stderr, "usage: gf_example_6\n"); + exit(1); +} + +int main(int argc, char **argv) +{ + uint32_t *a, *b; + int i, j; + gf_t gf, gf_16; + + if (gf_init_hard(&gf_16, 16, GF_MULT_LOG_TABLE, GF_REGION_DEFAULT, GF_DIVIDE_DEFAULT, + 0, 0, 0, NULL, NULL) == 0) { + fprintf(stderr, "gf_init_hard (6) failed\n"); + exit(1); + } + + if (gf_init_hard(&gf, 32, GF_MULT_COMPOSITE, GF_REGION_ALTMAP, GF_DIVIDE_DEFAULT, + 0, 2, 0, &gf_16, NULL) == 0) { + fprintf(stderr, "gf_init_hard (32) failed\n"); + exit(1); + } + + a = (uint32_t *) malloc(200); + b = (uint32_t *) malloc(200); + + a += 3; + b += 3; + + MOA_Seed(0); + + for (i = 0; i < 30; i++) a[i] = MOA_Random_W(32, 1); + + gf.multiply_region.w32(&gf, a, b, 0x12345678, 30*4, 0); + + printf("a: 0x%lx b: 0x%lx\n", (unsigned long) a, (unsigned long) b); + + for (i = 0; i < 30; i += 10) { + printf("\n"); + printf(" "); + for (j = 0; j < 10; j++) printf(" %8d", i+j); + printf("\n"); + + printf("a:"); + for (j = 0; j < 10; j++) printf(" %08x", a[i+j]); + printf("\n"); + + printf("b:"); + for (j = 0; j < 10; j++) printf(" %08x", b[i+j]); + printf("\n"); + printf("\n"); + } + + for (i = 0; i < 15; i ++) { + printf("Word %2d: 0x%08x * 0x12345678 = 0x%08x ", i, + gf.extract_word.w32(&gf, a, 30*4, i), + gf.extract_word.w32(&gf, b, 30*4, i)); + printf("Word %2d: 0x%08x * 0x12345678 = 0x%08x\n", i+15, + gf.extract_word.w32(&gf, a, 30*4, i+15), + gf.extract_word.w32(&gf, b, 30*4, i+15)); + } + return 0; +} |