ArmPkg: ArmLib: purge incorrect ArmDrainWriteBuffer () alias

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

/* @(#)w_exp.c 5.1 93/09/24 */\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_exp.c,v 1.9 2002/05/26 22:02:00 wiz Exp $");\r
#endif\r
\r
/*\r
 * wrapper exp(x)\r
 */\r
\r
#include "math.h"\r
#include "math_private.h"\r
\r
static const double\r
o_threshold=  7.09782712893383973096e+02,  /* 0x40862E42, 0xFEFA39EF */\r
u_threshold= -7.45133219101941108420e+02;  /* 0xc0874910, 0xD52D3051 */\r
\r
double\r
exp(double x)   /* wrapper exp */\r
{\r
#ifdef _IEEE_LIBM\r
  return __ieee754_exp(x);\r
#else\r
  double z;\r
  z = __ieee754_exp(x);\r
  if(_LIB_VERSION == _IEEE_) return z;\r
  if(finite(x)) {\r
      if(x>o_threshold)\r
          return __kernel_standard(x,x,6); /* exp overflow */\r
      else if(x<u_threshold)\r
          return __kernel_standard(x,x,7); /* exp underflow */\r
  }\r
  return z;\r
#endif\r
}\r