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Annotation of src/lib/libm/src/k_sinf.c, Revision 1.4

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:
1.3       jtc        16: #if defined(LIBM_SCCS) && !defined(lint)
1.4     ! jtc        17: static char rcsid[] = "$NetBSD: k_sinf.c,v 1.3 1994/09/22 16:40:23 jtc Exp $";
1.1       jtc        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;
1.2       jtc        44:        int32_t ix;
1.1       jtc        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: }