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

   1 /* wf_sqrt.c -- float version of w_sqrt.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 sqrtf(x)
  18  */
  19
  20 #include "fdlibm.h"
  21 #include <errno.h>
  22
  23 #ifdef __STDC__
  24         float sqrtf(float x)            /* wrapper sqrtf */
  25 #else
  26         float sqrtf(x)                  /* wrapper sqrtf */
  27         float x;
  28 #endif
  29 {
  30 #ifdef _IEEE_LIBM
  31         return __ieee754_sqrtf(x);
  32 #else
  33         float z;
  34         struct exception exc;
  35         z = __ieee754_sqrtf(x);
  36         if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
  37         if(x<(float)0.0) {
  38             /* sqrtf(negative) */
  39             exc.type = DOMAIN;
  40             exc.name = "sqrtf";
  41             exc.err = 0;
  42             exc.arg1 = exc.arg2 = (double)x;
  43             if (_LIB_VERSION == _SVID_)
  44               exc.retval = 0.0;
  45             else
  46               exc.retval = 0.0/0.0;
  47             if (_LIB_VERSION == _POSIX_)
  48               errno = EDOM;
  49             else if (!matherr(&exc)) {
  50               errno = EDOM;
  51             }
  52             if (exc.err != 0)
  53               errno = exc.err;
  54             return (float)exc.retval;
  55         } else
  56             return z;
  57 #endif
  58 }
  59
  60 #ifdef _DOUBLE_IS_32BITS
  61
  62 #ifdef __STDC__
  63         double sqrt(double x)
  64 #else
  65         double sqrt(x)
  66         double x;
  67 #endif
  68 {
  69         return (double) sqrtf((float) x);
  70 }
  71
  72 #endif /* defined(_DOUBLE_IS_32BITS) */