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dtest.c
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dtest.c
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/* Test dot-product function */
#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <math.h>
#include "config.h"
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include "fec.h"
#if HAVE_GETOPT_LONG
struct option Options[] = {
{"force-altivec",0,NULL,'a'},
{"force-port",0,NULL,'p'},
{"force-mmx",0,NULL,'m'},
{"force-sse",0,NULL,'s'},
{"force-sse2",0,NULL,'t'},
{"trials",0,NULL,'n'},
{NULL},
};
#endif
int main(int argc,char *argv[]){
short coeffs[512];
short input[2048];
int trials=1000,d;
int errors = 0;
#if HAVE_GETOPT_LONG
while((d = getopt_long(argc,argv,"apmstn:",Options,NULL)) != EOF){
#else
while((d = getopt(argc,argv,"apmstn:")) != EOF){
#endif
switch(d){
case 'a':
Cpu_mode = ALTIVEC;
break;
case 'p':
Cpu_mode = PORT;
break;
case 'm':
Cpu_mode = MMX;
break;
case 's':
Cpu_mode = SSE;
break;
case 't':
Cpu_mode = SSE2;
break;
case 'n':
trials = atoi(optarg);
break;
}
}
while(trials--){
long port_result;
long simd_result;
int ntaps;
int i;
int csum = 0;
int offset;
void *dp_simd,*dp_port;
/* Generate set of coefficients
* limit sum of absolute values to 32767 to avoid overflow
*/
memset(coeffs,0,sizeof(coeffs));
for(i=0;i<512;i++){
double gv;
gv = normal_rand(0.,100.);
if(csum + fabs(gv) > 32767)
break;
coeffs[i] = gv;
csum += fabs(gv);
}
ntaps = i;
/* Compare results to portable C version for a bunch of random data buffers and offsets */
dp_simd = initdp(coeffs,ntaps);
dp_port = initdp_port(coeffs,ntaps);
for(i=0;i<2048;i++)
input[i] = random();
offset = random() & 511;
simd_result = dotprod(dp_simd,input+offset);
port_result = dotprod_port(dp_port,input+offset);
if(simd_result != port_result){
errors++;
}
}
printf("dtest: %d errors\n",errors);
exit(0);
}