| /* e_sinhf.c -- float version of e_sinh.c. |
| * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
| */ |
| |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| #if defined(LIBM_SCCS) && !defined(lint) |
| static char rcsid[] = "$NetBSD: e_sinhf.c,v 1.4 1995/05/10 20:46:15 jtc Exp $"; |
| #endif |
| |
| #include "math.h" |
| #include "math_private.h" |
| |
| #ifdef __STDC__ |
| static const float one = 1.0, shuge = 1.0e37; |
| #else |
| static float one = 1.0, shuge = 1.0e37; |
| #endif |
| |
| #ifdef __STDC__ |
| float __ieee754_sinhf(float x) |
| #else |
| float __ieee754_sinhf(x) |
| float x; |
| #endif |
| { |
| float t,w,h; |
| int32_t ix,jx; |
| |
| GET_FLOAT_WORD(jx,x); |
| ix = jx&0x7fffffff; |
| |
| /* x is INF or NaN */ |
| if(ix>=0x7f800000) return x+x; |
| |
| h = 0.5; |
| if (jx<0) h = -h; |
| /* |x| in [0,22], return sign(x)*0.5*(E+E/(E+1))) */ |
| if (ix < 0x41b00000) { /* |x|<22 */ |
| if (ix<0x31800000) /* |x|<2**-28 */ |
| if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */ |
| t = __expm1f(fabsf(x)); |
| if(ix<0x3f800000) return h*((float)2.0*t-t*t/(t+one)); |
| return h*(t+t/(t+one)); |
| } |
| |
| /* |x| in [22, log(maxdouble)] return 0.5*exp(|x|) */ |
| if (ix < 0x42b17180) return h*__ieee754_expf(fabsf(x)); |
| |
| /* |x| in [log(maxdouble), overflowthresold] */ |
| if (ix<=0x42b2d4fc) { |
| w = __ieee754_expf((float)0.5*fabsf(x)); |
| t = h*w; |
| return t*w; |
| } |
| |
| /* |x| > overflowthresold, sinh(x) overflow */ |
| return x*shuge; |
| } |