mirror of
https://github.com/openhwgroup/cvw
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128 lines
3.0 KiB
C
128 lines
3.0 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 aSign, int aExp, double aFrac, int bSign, int bExp, double bFrac, int rSign, int rExp, double rFrac);
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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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// aExp & bExp are exponents
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// aFrac & bFrac are mantissas
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// rFrac is result of fractional divsion
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// rExp is result of exponent division
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double aFrac, bFrac, rFrac;
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int aExp, bExp, rExp;
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int aSign, bSign, rSign;
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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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bFrac = mantissa[i];
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bExp = exponent[i] + bias;
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bSign = i%2;
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for (j=0; j<ENTRIES; j++) {
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aFrac = mantissa[j];
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aExp = exponent[j] + bias;
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aSign = j%2;
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rFrac = aFrac/bFrac;
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rExp = aExp - bExp + bias;
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rSign = (i+j)%2;
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output(fptr, aSign, aExp, aFrac, bSign, bExp, bFrac, rSign, rExp, rFrac);
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}
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}
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// for (i = 0; i< RANDOM_VECS; i++) {
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// aFrac = random_input();
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// bFrac = random_input();
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// aExp = random_input_e() + BIAS; // make new random input function for exponents
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// bExp = random_input_e() + BIAS;
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// rFrac = a/b;
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// rEx[] = e1 - e2 + BIAS;
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// output(fptr, aExp, aFrac, bExp, bFrac, rExp, rFrac);
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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 aSign, int aExp, double aFrac, int bSign, int bExp, double bFrac, int rSign, int rExp, double rFrac)
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{
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// Print a in standard double format
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fprintf(fptr, "%03x", aExp|(aSign<<11));
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printhex(fptr, aFrac);
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fprintf(fptr, "_");
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// Print b in standard double format
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fprintf(fptr, "%03x", bExp|(bSign<<11));
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printhex(fptr, bFrac);
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fprintf(fptr, "_");
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// Print r in standard double format
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fprintf(fptr, "%03x", rExp|(rSign<<11));
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printhex(fptr, rFrac);
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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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