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glibc  2.9
Functions | Variables
e_sinhf.c File Reference
#include "math.h"
#include "math_private.h"

Go to the source code of this file.

Functions

float __ieee754_sinhf (float x)

Variables

static float one = 1.0
static float shuge = 1.0e37

Function Documentation

float __ieee754_sinhf ( float  x)

Definition at line 32 of file e_sinhf.c.

{      
       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;
}

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Variable Documentation

float one = 1.0 [static]

Definition at line 26 of file e_sinhf.c.

float shuge = 1.0e37 [static]

Definition at line 26 of file e_sinhf.c.