58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* 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
|
|
__ieee754_sinhf(float x)
|
|
{
|
|
float t,w,h;
|
|
int32_t ix,jx;
|
|
|
|
GET_FLOAT_WORD(jx,x);
|
|
ix = jx&0x7fffffff;
|
|
|
|
/* x is INF or NaN */
|
|
if(__builtin_expect(ix>=0x7f800000, 0)) 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 (__builtin_expect(ix<0x31800000, 0)) /* |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;
|
|
}
|
|
strong_alias (__ieee754_sinhf, __sinhf_finite)
|