src/math/tgamma.c

   1 #include <stdint.h>
   2 #include <stdio.h>
   3 #include "mtest.h"
   4
   5 static struct d_d t[] = {
   6 #include "sanity/tgamma.h"
   7 #include "special/tgamma.h"
   8
   9 };
  10
  11 int main(void)
  12 {
  13         #pragma STDC FENV_ACCESS ON
  14         double y;
  15         float d;
  16         int e, i, err = 0;
  17         struct d_d *p;
  18
  19         for (i = 0; i < sizeof t/sizeof *t; i++) {
  20                 p = t + i;
  21
  22                 if (p->r < 0)
  23                         continue;
  24                 fesetround(p->r);
  25                 feclearexcept(FE_ALL_EXCEPT);
  26                 y = tgamma(p->x);
  27                 e = fetestexcept(INEXACT|INVALID|DIVBYZERO|UNDERFLOW|OVERFLOW);
  28
  29                 if (!checkexcept(e, p->e, p->r)) {
  30                         printf("%s:%d: bad fp exception: %s tgamma(%a)=%a, want %s",
  31                                 p->file, p->line, rstr(p->r), p->x, p->y, estr(p->e));
  32                         printf(" got %s\n", estr(e));
  33                         err++;
  34                 }
  35                 d = ulperr(y, p->y, p->dy);
  36                 // TODO: 2 ulp errors allowed
  37                 if (p->r==RN && fabs(d)>2) {
  38                         printf("%s:%d: %s tgamma(%a) want %a got %a ulperr %.3f = %a + %a\n",
  39                                 p->file, p->line, rstr(p->r), p->x, p->y, y, d, d-p->dy, p->dy);
  40                         err++;
  41                 }
  42         }
  43         return !!err;
  44 }