| /* 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. |
| * ==================================================== |
| */ |
| |
| #include "math.h" |
| #include "math_private.h" |
| |
| static const float one = 1.0, shuge = 1.0e37; |
| |
| float |
| sinhf(float x) |
| { |
| float t,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 [0,9], return sign(x)*0.5*(E+E/(E+1))) */ |
| if (ix < 0x41100000) { /* |x|<9 */ |
| if (ix<0x39800000) /* |x|<2**-12 */ |
| 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 [9, logf(maxfloat)] return 0.5*exp(|x|) */ |
| if (ix < 0x42b17217) return h*expf(fabsf(x)); |
| |
| /* |x| in [logf(maxfloat), overflowthresold] */ |
| if (ix<=0x42b2d4fc) |
| return h*2.0F*__ldexp_expf(fabsf(x), -1); |
| |
| /* |x| > overflowthresold, sinh(x) overflow */ |
| return x*shuge; |
| } |