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

   1 /* wf_hypot.c -- float version of w_hypot.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 hypotf(x,y)
  18  */
  19
  20 #include "fdlibm.h"
  21 #include <errno.h>
  22
  23 #ifdef __STDC__
  24         float hypotf(float x, float y)  /* wrapper hypotf */
  25 #else
  26         float hypotf(x,y)               /* wrapper hypotf */
  27         float x,y;
  28 #endif
  29 {
  30 #ifdef _IEEE_LIBM
  31         return __ieee754_hypotf(x,y);
  32 #else
  33         float z;
  34         struct exception exc;
  35         z = __ieee754_hypotf(x,y);
  36         if(_LIB_VERSION == _IEEE_) return z;
  37         if((!finitef(z))&&finitef(x)&&finitef(y)) {
  38             /* hypotf(finite,finite) overflow */
  39 #ifndef HUGE_VAL
  40 #define HUGE_VAL inf
  41             double inf = 0.0;
  42
  43             SET_HIGH_WORD(inf,0x7ff00000);      /* set inf to infinite */
  44 #endif
  45             exc.type = OVERFLOW;
  46             exc.name = "hypotf";
  47             exc.err = 0;
  48             exc.arg1 = (double)x;
  49             exc.arg2 = (double)y;
  50             if (_LIB_VERSION == _SVID_)
  51                exc.retval = HUGE;
  52             else
  53                exc.retval = HUGE_VAL;
  54             if (_LIB_VERSION == _POSIX_)
  55                errno = ERANGE;
  56             else if (!matherr(&exc)) {
  57                 errno = ERANGE;
  58             }
  59             if (exc.err != 0)
  60                errno = exc.err;
  61             return (float)exc.retval;
  62         } else
  63             return z;
  64 #endif
  65 }
  66
  67 #ifdef _DOUBLE_IS_32BITS
  68
  69 #ifdef __STDC__
  70         double hypot(double x, double y)
  71 #else
  72         double hypot(x,y)
  73         double x,y;
  74 #endif
  75 {
  76         return (double) hypotf((float) x, (float) y);
  77 }
  78
  79 #endif /* defined(_DOUBLE_IS_32BITS) */