+++ /dev/null
-/* @(#)e_sinh.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: e_sinh.c,v 1.11 2002/05/26 22:01:52 wiz Exp $");\r
-#endif\r
-\r
-#include "math.h"\r
-#include "math_private.h"\r
-\r
-/* __ieee754_sinh(x)\r
- * Method :\r
- * mathematically sinh(x) if defined to be (exp(x)-exp(-x))/2\r
- * 1. Replace x by |x| (sinh(-x) = -sinh(x)).\r
- * 2.\r
- * E + E/(E+1)\r
- * 0 <= x <= 22 : sinh(x) := --------------, E=expm1(x)\r
- * 2\r
- *\r
- * 22 <= x <= lnovft : sinh(x) := exp(x)/2\r
- * lnovft <= x <= ln2ovft: sinh(x) := exp(x/2)/2 * exp(x/2)\r
- * ln2ovft < x : sinh(x) := x*shuge (overflow)\r
- *\r
- * Special cases:\r
- * sinh(x) is |x| if x is +INF, -INF, or NaN.\r
- * only sinh(0)=0 is exact for finite x.\r
- */\r
-\r
-static const double one = 1.0, shuge = 1.0e307;\r
-\r
-double\r
-__ieee754_sinh(double x)\r
-{\r
- double t,w,h;\r
- int32_t ix,jx;\r
- u_int32_t lx;\r
-\r
- /* High word of |x|. */\r
- GET_HIGH_WORD(jx,x);\r
- ix = jx&0x7fffffff;\r
-\r
- /* x is INF or NaN */\r
- if(ix>=0x7ff00000) return x+x;\r
-\r
- h = 0.5;\r
- if (jx<0) h = -h;\r
- /* |x| in [0,22], return sign(x)*0.5*(E+E/(E+1))) */\r
- if (ix < 0x40360000) { /* |x|<22 */\r
- if (ix<0x3e300000) /* |x|<2**-28 */\r
- if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */\r
- t = expm1(fabs(x));\r
- if(ix<0x3ff00000) return h*(2.0*t-t*t/(t+one));\r
- return h*(t+t/(t+one));\r
- }\r
-\r
- /* |x| in [22, log(maxdouble)] return 0.5*exp(|x|) */\r
- if (ix < 0x40862E42) return h*__ieee754_exp(fabs(x));\r
-\r
- /* |x| in [log(maxdouble), overflowthresold] */\r
- GET_LOW_WORD(lx,x);\r
- if (ix<0x408633CE || ((ix==0x408633ce)&&(lx<=(u_int32_t)0x8fb9f87d))) {\r
- w = __ieee754_exp(0.5*fabs(x));\r
- t = h*w;\r
- return t*w;\r
- }\r
-\r
- /* |x| > overflowthresold, sinh(x) overflow */\r
- return x*shuge;\r
-}\r