forked from Github_Repos/cvw
126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/* sqrttestgen.c */
|
|
|
|
/* Written 7/22/2022 by Cedar Turek
|
|
|
|
This program creates test vectors for mantissa component
|
|
of an IEEE floating point square root.
|
|
*/
|
|
|
|
/* #includes */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
|
|
/* Constants */
|
|
|
|
#define ENTRIES 17
|
|
#define BIGENT 1000
|
|
#define RANDOM_VECS 500
|
|
|
|
/* Prototypes */
|
|
|
|
void output(FILE *fptr, int aExp, double aFrac, int rExp, double rFrac);
|
|
void printhex(FILE *fptr, double x);
|
|
double random_input(void);
|
|
|
|
/* Main */
|
|
|
|
void main(void)
|
|
{
|
|
FILE *fptr;
|
|
double aFrac, rFrac;
|
|
int aExp, rExp;
|
|
double mans[ENTRIES] = {1, 1849.0/1024, 1.25, 1.125, 1.0625,
|
|
1.75, 1.875, 1.99999,
|
|
1.1, 1.5, 1.01, 1.001, 1.0001,
|
|
2/1.1, 2/1.5, 2/1.25, 2/1.125};
|
|
|
|
double bigtest[BIGENT];
|
|
|
|
double exps[ENTRIES] = {0, 0, 2, 3, 4, 5, 6, 7, 8, 1, 10,
|
|
11, 12, 13, 14, 15, 16};
|
|
int i;
|
|
int bias = 1023;
|
|
|
|
if ((fptr = fopen("sqrttestvectors","w")) == NULL) {
|
|
fprintf(stderr, "Couldn't write sqrttestvectors file\n");
|
|
exit(1);
|
|
}
|
|
|
|
// Small Test
|
|
// for (i=0; i<ENTRIES; i++) {
|
|
// aFrac = mans[i];
|
|
// aExp = exps[i] + bias;
|
|
// rFrac = sqrt(aFrac * pow(2, exps[i]));
|
|
// rExp = (int) (log(rFrac)/log(2) + bias);
|
|
// output(fptr, aExp, aFrac, rExp, rFrac);
|
|
// }
|
|
|
|
// WS
|
|
// Test 1: sqrt(1) = 1 0000 0000 0000 00
|
|
// Test 2: sqrt(1849/1024) = 43/32 0000 1100 1110 01
|
|
// Test 3: sqrt(5) 0000 0100 0000 00
|
|
// Test 4: sqrt(9) = 3 1111 1001 0000 00
|
|
// Test 5: sqrt(17) 0000 0001 0000 00
|
|
// Test 6: sqrt(56) 1111 1110 0000 00
|
|
// Test 7: sqrt(120) 0000 1110 0000 00
|
|
|
|
// for (i = 0; i< RANDOM_VECS; i++) {
|
|
// a = random_input();
|
|
// r = sqrt(a);
|
|
// output(fptr, a, r);
|
|
// }
|
|
|
|
// Big Test
|
|
for (i=0; i<BIGENT; i++) {
|
|
bigtest[i] = random_input();
|
|
aFrac = bigtest[i];
|
|
aExp = (i - BIGENT/2) + bias;
|
|
rFrac = sqrt(aFrac * pow(2, (i - BIGENT/2)));
|
|
rExp = (int) (log(rFrac)/log(2) + bias);
|
|
output(fptr, aExp, aFrac, rExp, rFrac);
|
|
}
|
|
|
|
fclose(fptr);
|
|
}
|
|
|
|
/* Functions */
|
|
|
|
void output(FILE *fptr, int aExp, double aFrac, int rExp, double rFrac)
|
|
{
|
|
// Print a in standard double format
|
|
fprintf(fptr, "%03x", aExp);
|
|
printhex(fptr, aFrac);
|
|
fprintf(fptr, "_");
|
|
|
|
// Spacing for testbench, value doesn't matter
|
|
fprintf(fptr, "%016x", 0);
|
|
fprintf(fptr, "_");
|
|
|
|
// Print r in standard double format
|
|
fprintf(fptr, "%03x", rExp);
|
|
printhex(fptr, rFrac);
|
|
fprintf(fptr, "\n");
|
|
}
|
|
|
|
void printhex(FILE *fptr, double m)
|
|
{
|
|
int i, val;
|
|
|
|
while (m<1) m *= 2;
|
|
while (m>2) m /= 2;
|
|
for (i=0; i<52; i+=4) {
|
|
m = m - floor(m);
|
|
m = m * 16;
|
|
val = (int)(m)%16;
|
|
fprintf(fptr, "%x", val);
|
|
}
|
|
}
|
|
|
|
double random_input(void)
|
|
{
|
|
return 1.0 + ((rand() % 32768)/32767.0);
|
|
}
|
|
|