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57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/* s_cosf.c -- float version of s_cos.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: s_cosf.c,v 1.4 1995/05/10 20:47:03 jtc Exp $";
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#endif
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#include <errno.h>
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#include <math.h>
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#include <math_private.h>
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static const float one=1.0;
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float __cosf(float x)
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{
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float y[2],z=0.0;
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int32_t n,ix;
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GET_FLOAT_WORD(ix,x);
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/* |x| ~< pi/4 */
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ix &= 0x7fffffff;
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if(ix <= 0x3f490fd8) return __kernel_cosf(x,z);
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/* cos(Inf or NaN) is NaN */
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else if (ix>=0x7f800000) {
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if (ix == 0x7f800000)
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__set_errno (EDOM);
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return x-x;
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}
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/* argument reduction needed */
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else {
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n = __ieee754_rem_pio2f(x,y);
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switch(n&3) {
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case 0: return __kernel_cosf(y[0],y[1]);
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case 1: return -__kernel_sinf(y[0],y[1],1);
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case 2: return -__kernel_cosf(y[0],y[1]);
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default:
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return __kernel_sinf(y[0],y[1],1);
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}
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}
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}
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weak_alias (__cosf, cosf)
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