Fix a bug about the iSCSI DHCP dependency issue.

[mirror_edk2.git] / StdLib / LibC / Math / w_pow.c

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/* @(#)w_pow.c 5.2 93/10/01 */\r
/*\r
 * ====================================================\r
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.\r
 *\r
 * Developed at SunPro, a Sun Microsystems, Inc. business.\r
 * Permission to use, copy, modify, and distribute this\r
 * software is freely granted, provided that this notice\r
 * is preserved.\r
 * ====================================================\r
 */\r
#include  <LibConfig.h>\r
#include  <sys/EfiCdefs.h>\r
#if defined(LIBM_SCCS) && !defined(lint)\r
__RCSID("$NetBSD: w_pow.c,v 1.7 2002/05/26 22:02:02 wiz Exp $");\r
#endif\r
\r
/*\r
 * wrapper pow(x,y) return x**y\r
 */\r
\r
#include "math.h"\r
#include "math_private.h"\r
\r
\r
double\r
pow(double x, double y) /* wrapper pow */\r
{\r
#ifdef _IEEE_LIBM\r
  return  __ieee754_pow(x,y);\r
#else\r
  double z;\r
  z=__ieee754_pow(x,y);\r
  if(_LIB_VERSION == _IEEE_|| isnan(y)) return z;\r
  if(isnan(x)) {\r
      if(y==0.0)\r
          return __kernel_standard(x,y,42); /* pow(NaN,0.0) */\r
      else\r
    return z;\r
  }\r
  if(x==0.0){\r
      if(y==0.0)\r
          return __kernel_standard(x,y,20); /* pow(0.0,0.0) */\r
      if(finite(y)&&y<0.0)\r
          return __kernel_standard(x,y,23); /* pow(0.0,negative) */\r
      return z;\r
  }\r
  if(!finite(z)) {\r
      if(finite(x)&&finite(y)) {\r
          if(isnan(z))\r
              return __kernel_standard(x,y,24); /* pow neg**non-int */\r
          else\r
              return __kernel_standard(x,y,21); /* pow overflow */\r
      }\r
  }\r
  if(z==0.0&&finite(x)&&finite(y))\r
      return __kernel_standard(x,y,22); /* pow underflow */\r
  return z;\r
#endif\r
}\r