Blame sysdeps/ieee754/flt-32/k_sinf.c

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/* k_sinf.c -- float version of k_sin.c
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 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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 */
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/*
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 * ====================================================
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 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 *
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 * Developed at SunPro, a Sun Microsystems, Inc. business.
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 * Permission to use, copy, modify, and distribute this
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 * software is freely granted, provided that this notice
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 * is preserved.
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 * ====================================================
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 */
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#if defined(LIBM_SCCS) && !defined(lint)
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static char rcsid[] = "$NetBSD: k_sinf.c,v 1.4 1995/05/10 20:46:33 jtc Exp $";
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#endif
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#include <float.h>
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#include <math.h>
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#include <math_private.h>
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#include <math-underflow.h>
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static const float
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half =  5.0000000000e-01,/* 0x3f000000 */
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S1  = -1.6666667163e-01, /* 0xbe2aaaab */
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S2  =  8.3333337680e-03, /* 0x3c088889 */
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S3  = -1.9841270114e-04, /* 0xb9500d01 */
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S4  =  2.7557314297e-06, /* 0x3638ef1b */
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S5  = -2.5050759689e-08, /* 0xb2d72f34 */
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S6  =  1.5896910177e-10; /* 0x2f2ec9d3 */
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float __kernel_sinf(float x, float y, int iy)
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{
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	float z,r,v;
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	int32_t ix;
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	GET_FLOAT_WORD(ix,x);
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	ix &= 0x7fffffff;			/* high word of x */
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	if(ix<0x32000000)			/* |x| < 2**-27 */
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	  {
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	    math_check_force_underflow (x);
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	    if ((int) x == 0)
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	      return x;		/* generate inexact */
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	  }
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	z	=  x*x;
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	v	=  z*x;
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	r	=  S2+z*(S3+z*(S4+z*(S5+z*S6)));
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	if(iy==0) return x+v*(S1+z*r);
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	else      return x-((z*(half*y-v*r)-y)-v*S1);
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}