toolchain/gcc/newlib/libm/math/wf_atan2.c

   1 /* wf_atan2.c -- float version of w_atan2.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 /*
  18  * wrapper atan2f(y,x)
  19  */
  20
  21 #include "fdlibm.h"
  22 #include <errno.h>
  23
  24 #ifdef __STDC__
  25         float atan2f(float y, float x)          /* wrapper atan2f */
  26 #else
  27         float atan2f(y,x)                       /* wrapper atan2 */
  28         float y,x;
  29 #endif
  30 {
  31 #ifdef _IEEE_LIBM
  32         return __ieee754_atan2f(y,x);
  33 #else
  34         float z;
  35         struct exception exc;
  36         z = __ieee754_atan2f(y,x);
  37         if(_LIB_VERSION == _IEEE_||isnanf(x)||isnanf(y)) return z;
  38         if(x==(float)0.0&&y==(float)0.0) {
  39             /* atan2f(+-0,+-0) */
  40             exc.arg1 = y;
  41             exc.arg2 = x;
  42             exc.err = 0;
  43             exc.type = DOMAIN;
  44             exc.name = "atan2f";
  45             exc.retval = 0.0;
  46             if(_LIB_VERSION == _POSIX_)
  47                errno = EDOM;
  48             else if (!matherr(&exc)) {
  49                errno = EDOM;
  50             }
  51             if (exc.err != 0)
  52                errno = exc.err;
  53             return (float)exc.retval;
  54         } else
  55             return z;
  56 #endif
  57 }
  58
  59 #ifdef _DOUBLE_IS_32BITS
  60
  61 #ifdef __STDC__
  62         double atan2(double y, double x)
  63 #else
  64         double atan2(y,x)
  65         double y,x;
  66 #endif
  67 {
  68         return (double) atan2f((float) y, (float) x);
  69 }
  70
  71 #endif /* defined(_DOUBLE_IS_32BITS) */