Return to k_sinf.c CVS log

Up to [cvs.NetBSD.org] / src / lib / libm / src

Annotation of src/lib/libm/src/k_sinf.c, Revision 1.1

1.1     ! jtc         1: /* k_sinf.c -- float version of k_sin.c
        !             2:  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
        !             3:  */
        !             4:
        !             5: /*
        !             6:  * ====================================================
        !             7:  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
        !             8:  *
        !             9:  * Developed at SunPro, a Sun Microsystems, Inc. business.
        !            10:  * Permission to use, copy, modify, and distribute this
        !            11:  * software is freely granted, provided that this notice
        !            12:  * is preserved.
        !            13:  * ====================================================
        !            14:  */
        !            15:
        !            16: #ifndef lint
        !            17: static char rcsid[] = "$Id: $";
        !            18: #endif
        !            19:
        !            20: #include "math.h"
        !            21: #include "math_private.h"
        !            22:
        !            23: #ifdef __STDC__
        !            24: static const float
        !            25: #else
        !            26: static float
        !            27: #endif
        !            28: half =  5.0000000000e-01,/* 0x3f000000 */
        !            29: S1  = -1.6666667163e-01, /* 0xbe2aaaab */
        !            30: S2  =  8.3333337680e-03, /* 0x3c088889 */
        !            31: S3  = -1.9841270114e-04, /* 0xb9500d01 */
        !            32: S4  =  2.7557314297e-06, /* 0x3638ef1b */
        !            33: S5  = -2.5050759689e-08, /* 0xb2d72f34 */
        !            34: S6  =  1.5896910177e-10; /* 0x2f2ec9d3 */
        !            35:
        !            36: #ifdef __STDC__
        !            37:        float __kernel_sinf(float x, float y, int iy)
        !            38: #else
        !            39:        float __kernel_sinf(x, y, iy)
        !            40:        float x,y; int iy;              /* iy=0 if y is zero */
        !            41: #endif
        !            42: {
        !            43:        float z,r,v;
        !            44:        int ix;
        !            45:        GET_FLOAT_WORD(ix,x);
        !            46:        ix &= 0x7fffffff;                       /* high word of x */
        !            47:        if(ix<0x32000000)                       /* |x| < 2**-27 */
        !            48:           {if((int)x==0) return x;}            /* generate inexact */
        !            49:        z       =  x*x;
        !            50:        v       =  z*x;
        !            51:        r       =  S2+z*(S3+z*(S4+z*(S5+z*S6)));
        !            52:        if(iy==0) return x+v*(S1+z*r);
        !            53:        else      return x-((z*(half*y-v*r)-y)-v*S1);
        !            54: }