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       ---
       k_sinf.c (1355B)
       ---
            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[] = "$FreeBSD: src/lib/msun/src/k_sinf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
           18 #endif
           19 
           20 #include "math.h"
           21 #include "math_private.h"
           22 
           23 static const float
           24 half =  5.0000000000e-01,/* 0x3f000000 */
           25 S1  = -1.6666667163e-01, /* 0xbe2aaaab */
           26 S2  =  8.3333337680e-03, /* 0x3c088889 */
           27 S3  = -1.9841270114e-04, /* 0xb9500d01 */
           28 S4  =  2.7557314297e-06, /* 0x3638ef1b */
           29 S5  = -2.5050759689e-08, /* 0xb2d72f34 */
           30 S6  =  1.5896910177e-10; /* 0x2f2ec9d3 */
           31 
           32 float
           33 __kernel_sinf(float x, float y, int iy)
           34 {
           35         float z,r,v;
           36         int32_t ix;
           37         GET_FLOAT_WORD(ix,x);
           38         ix &= 0x7fffffff;                        /* high word of x */
           39         if(ix<0x32000000)                        /* |x| < 2**-27 */
           40            {if((int)x==0) return x;}                /* generate inexact */
           41         z        =  x*x;
           42         v        =  z*x;
           43         r        =  S2+z*(S3+z*(S4+z*(S5+z*S6)));
           44         if(iy==0) return x+v*(S1+z*r);
           45         else      return x-((z*(half*y-v*r)-y)-v*S1);
           46 }