src/math/lgammal.c

   1 #define _BSD_SOURCE 1
   2 #define _XOPEN_SOURCE 700
   3 #include <stdint.h>
   4 #include <stdio.h>
   5 #include "mtest.h"
   6
   7 static struct l_li t[] = {
   8 #if LDBL_MANT_DIG == 53
   9 #include "sanity/lgamma.h"
  10 #include "special/lgamma.h"
  11
  12 #elif LDBL_MANT_DIG == 64
  13 #include "sanity/lgammal.h"
  14 #include "special/lgammal.h"
  15
  16 #endif
  17 };
  18
  19 int main(void)
  20 {
  21         #pragma STDC FENV_ACCESS ON
  22         int yi;
  23         long double y;
  24         float d;
  25         int e, i, err = 0;
  26         struct l_li *p;
  27
  28         for (i = 0; i < sizeof t/sizeof *t; i++) {
  29                 p = t + i;
  30
  31                 if (p->r < 0)
  32                         continue;
  33                 fesetround(p->r);
  34                 feclearexcept(FE_ALL_EXCEPT);
  35                 y = lgammal(p->x);
  36                 yi = signgam;
  37                 e = fetestexcept(INEXACT|INVALID|DIVBYZERO|UNDERFLOW|OVERFLOW);
  38
  39                 if (!checkexcept(e, p->e, p->r)) {
  40                         printf("%s:%d: bad fp exception: %s lgammal(%La)=%La,%lld, want %s",
  41                                 p->file, p->line, rstr(p->r), p->x, p->y, p->i, estr(p->e));
  42                         printf(" got %s\n", estr(e));
  43                         err++;
  44                 }
  45                 d = ulperrl(y, p->y, p->dy);
  46                 // TODO: 2 ulp errors allowed
  47                 if ((p->r==RN && fabs(d) > 2) || (!isnan(p->x) && p->x!=-inf && !(p->e&DIVBYZERO) && yi != p->i)) {
  48                         printf("%s:%d: %s lgammal(%La) want %La,%lld got %La,%d ulperr %.3f = %a + %a\n",
  49                                 p->file, p->line, rstr(p->r), p->x, p->y, p->i, y, yi, d, d-p->dy, p->dy);
  50                         err++;
  51                 }
  52         }
  53         return !!err;
  54 }