toolchain/gcc/newlib/libm/math/wrf_lgamma.c

   1 /* wrf_lgamma.c -- float version of wr_lgamma.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 /*
  17  * wrapper float lgammaf_r(float x, int *signgamp)
  18  */
  19
  20 #include "fdlibm.h"
  21 #include <errno.h>
  22
  23 #ifdef __STDC__
  24         float lgammaf_r(float x, int *signgamp) /* wrapper lgammaf_r */
  25 #else
  26         float lgammaf_r(x,signgamp)              /* wrapper lgammaf_r */
  27         float x; int *signgamp;
  28 #endif
  29 {
  30 #ifdef _IEEE_LIBM
  31         return __ieee754_lgammaf_r(x,signgamp);
  32 #else
  33         float y;
  34         struct exception exc;
  35         y = __ieee754_lgammaf_r(x,signgamp);
  36         if(_LIB_VERSION == _IEEE_) return y;
  37         if(!finitef(y)&&finitef(x)) {
  38 #ifndef HUGE_VAL
  39 #define HUGE_VAL inf
  40             double inf = 0.0;
  41
  42             SET_HIGH_WORD(inf,0x7ff00000);      /* set inf to infinite */
  43 #endif
  44             exc.name = "lgammaf";
  45             exc.err = 0;
  46             exc.arg1 = exc.arg2 = (double)x;
  47             if (_LIB_VERSION == _SVID_)
  48                exc.retval = HUGE;
  49             else
  50                exc.retval = HUGE_VAL;
  51             if(floorf(x)==x&&x<=(float)0.0) {
  52                 /* lgammaf(-integer) or lgamma(0) */
  53                 exc.type = SING;
  54                 if (_LIB_VERSION == _POSIX_)
  55                    errno = EDOM;
  56                 else if (!matherr(&exc)) {
  57                    errno = EDOM;
  58                 }
  59
  60             } else {
  61                 /* lgammaf(finite) overflow */
  62                 exc.type = OVERFLOW;
  63                 if (_LIB_VERSION == _POSIX_)
  64                    errno = ERANGE;
  65                 else if (!matherr(&exc)) {
  66                    errno = ERANGE;
  67                 }
  68             }
  69             if (exc.err != 0)
  70                errno = exc.err;
  71             return (float)exc.retval;
  72         } else
  73             return y;
  74 #endif
  75 }