mirror of
https://github.com/openhwgroup/cvw
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122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
/* testgen.c */
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/* Written 2/19/2022 by David Harris
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This program creates test vectors for mantissa and exponent components
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of an IEEE floating point divider.
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Builds upon program that creates test vectors for mantissa component only.
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*/
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/* #includes */
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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/* Constants */
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#define ENTRIES 17
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#define RANDOM_VECS 500
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// #define BIAS 1023 // Bias is for double precision
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/* Prototypes */
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void output(FILE *fptr, int e1, double a, int e2, double b, int r_exp, double r_mantissa);
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void printhex(FILE *fptr, double x);
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double random_input(void);
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double random_input_e(void);
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/* Main */
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void main(void)
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{
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FILE *fptr;
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// e1 & e2 are exponents
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// a & b are mantissas
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// r_mantissa is result of mantissa divsion
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// r_exp is result of exponent division
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double a, b, r_mantissa, r_exp;
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int e1, e2;
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double mantissa[ENTRIES] = {1, 1.5, 1.25, 1.125, 1.0625,
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1.75, 1.875, 1.99999,
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1.1, 1.2, 1.01, 1.001, 1.0001,
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1/1.1, 1/1.5, 1/1.25, 1/1.125};
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int exponent[ENTRIES] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17};
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int i, j;
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int bias = 1023;
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if ((fptr = fopen("testvectors","w")) == NULL) {
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fprintf(stderr, "Couldn't write testvectors file\n");
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exit(1);
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}
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for (i=0; i<ENTRIES; i++) {
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b = mantissa[i];
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e2 = exponent[i] + bias;
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for (j=0; j<ENTRIES; j++) {
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a = mantissa[j];
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e1 = exponent[j] + bias;
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r_mantissa = a/b;
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r_exp = e1 - e2 + bias;
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output(fptr, e1, a, e2, b, r_exp, r_mantissa);
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}
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}
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// for (i = 0; i< RANDOM_VECS; i++) {
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// a = random_input();
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// b = random_input();
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// e1 = random_input_e() + BIAS; // make new random input function for exponents
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// e2 = random_input_e() + BIAS;
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// r_mantissa = a/b;
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// r_exp = e1 - e2 + BIAS;
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// output(fptr, e1, a, e2, b, r_exp, r_mantissa);
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// }
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fclose(fptr);
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}
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/* Functions */
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void output(FILE *fptr, int e1, double a, int e2, double b, int r_exp, double r_mantissa)
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{
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fprintf(fptr, "%03x", e1);
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//printhex(fptr, e1, exp);
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printhex(fptr, a);
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fprintf(fptr, "_");
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fprintf(fptr, "%03x", e2);
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//printhex(fptr, e2, exp);
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printhex(fptr, b);
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fprintf(fptr, "_");
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fprintf(fptr, "%03x", r_exp);
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//printhex(fptr, r_exp, exp);
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printhex(fptr, r_mantissa);
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fprintf(fptr, "\n");
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}
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void printhex(FILE *fptr, double m)
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{
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int i, val, len;
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len = 52;
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while (m<1) m *= 2;
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while (m>2) m /= 2;
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for (i=0; i<len; i+=4) {
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m = m - floor(m);
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m = m * 16;
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val = (int)(m)%16;
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fprintf(fptr, "%x", val);
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}
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}
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double random_input(void)
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{
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return 1.0 + rand()/32767.0;
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}
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double random_input_e(void)
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{
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return rand() % 300 + 1;
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}
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