ArmPkg: ArmLib: purge incorrect ArmDrainWriteBuffer () alias

[mirror_edk2.git] / StdLib / LibC / Math / w_log2.c

/* @(#)w_log10.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_log2.c,v 1.1 2005/07/21 16:58:39 christos Exp $");\r
#endif\r
\r
/*\r
 * wrapper log2(X)\r
 */\r
\r
#include "math.h"\r
#include "math_private.h"\r
\r
\r
double\r
log2(double x)    /* wrapper log10 */\r
{\r
#ifdef _IEEE_LIBM\r
  return __ieee754_log2(x);\r
#else\r
  double z;\r
  z = __ieee754_log2(x);\r
  if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;\r
  if(x<=0.0) {\r
      if(x==0.0)\r
          return __kernel_standard(x,x,48); /* log2(0) */\r
      else\r
          return __kernel_standard(x,x,49); /* log2(x<0) */\r
  } else\r
      return z;\r
#endif\r
}\r