src/math/lgammal.c

   1 #define _DEFAULT_SOURCE 1
   2 #define _BSD_SOURCE 1
   3 #define _XOPEN_SOURCE 700
   4 #include <stdint.h>
   5 #include <stdio.h>
   6 #include "mtest.h"
   7
   8 static struct l_li t[] = {
   9 #if LDBL_MANT_DIG == 53
  10 #include "sanity/lgamma.h"
  11 #include "special/lgamma.h"
  12
  13 #elif LDBL_MANT_DIG == 64
  14 #include "sanity/lgammal.h"
  15 #include "special/lgammal.h"
  16
  17 #endif
  18 };
  19
  20 int main(void)
  21 {
  22         #pragma STDC FENV_ACCESS ON
  23         int yi;
  24         long double y;
  25         float d;
  26         int e, i, err = 0;
  27         struct l_li *p;
  28
  29         for (i = 0; i < sizeof t/sizeof *t; i++) {
  30                 p = t + i;
  31
  32                 if (p->r < 0)
  33                         continue;
  34                 fesetround(p->r);
  35                 feclearexcept(FE_ALL_EXCEPT);
  36                 y = lgammal(p->x);
  37                 yi = signgam;
  38                 e = fetestexcept(INEXACT|INVALID|DIVBYZERO|UNDERFLOW|OVERFLOW);
  39
  40                 if (!checkexcept(e, p->e, p->r)) {
  41                         printf("%s:%d: bad fp exception: %s lgammal(%La)=%La,%lld, want %s",
  42                                 p->file, p->line, rstr(p->r), p->x, p->y, p->i, estr(p->e));
  43                         printf(" got %s\n", estr(e));
  44                         err++;
  45                 }
  46                 d = ulperrl(y, p->y, p->dy);
  47                 // TODO: 2 ulp errors allowed
  48                 if ((p->r==RN && fabs(d) > 2) || (!isnan(p->x) && p->x!=-inf && !(p->e&DIVBYZERO) && yi != p->i)) {
  49                         printf("%s:%d: %s lgammal(%La) want %La,%lld got %La,%d ulperr %.3f = %a + %a\n",
  50                                 p->file, p->line, rstr(p->r), p->x, p->y, p->i, y, yi, d, d-p->dy, p->dy);
  51                         err++;
  52                 }
  53         }
  54         return !!err;
  55 }