1/* s_sinf.c -- float version of s_sin.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 * Optimized by Bruce D. Evans.
4 */
5
6/*
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 *
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
13 * is preserved.
14 * ====================================================
15 */
16
17#include <sys/cdefs.h>
18__FBSDID("$FreeBSD$");
19
20#include <float.h>
21
22#include "math.h"
23#define	INLINE_KERNEL_COSDF
24#define	INLINE_KERNEL_SINDF
25#define INLINE_REM_PIO2F
26#include "math_private.h"
27#include "e_rem_pio2f.c"
28#include "k_cosf.c"
29#include "k_sinf.c"
30
31/* Small multiples of pi/2 rounded to double precision. */
32static const double
33s1pio2 = 1*M_PI_2,			/* 0x3FF921FB, 0x54442D18 */
34s2pio2 = 2*M_PI_2,			/* 0x400921FB, 0x54442D18 */
35s3pio2 = 3*M_PI_2,			/* 0x4012D97C, 0x7F3321D2 */
36s4pio2 = 4*M_PI_2;			/* 0x401921FB, 0x54442D18 */
37
38float
39sinf(float x)
40{
41	double y;
42	int32_t n, hx, ix;
43
44	GET_FLOAT_WORD(hx,x);
45	ix = hx & 0x7fffffff;
46
47	if(ix <= 0x3f490fda) {		/* |x| ~<= pi/4 */
48	    if(ix<0x39800000)		/* |x| < 2**-12 */
49		if(((int)x)==0) return x;	/* x with inexact if x != 0 */
50	    return __kernel_sindf(x);
51	}
52	if(ix<=0x407b53d1) {		/* |x| ~<= 5*pi/4 */
53	    if(ix<=0x4016cbe3) {	/* |x| ~<= 3pi/4 */
54		if(hx>0)
55		    return __kernel_cosdf(x - s1pio2);
56		else
57		    return -__kernel_cosdf(x + s1pio2);
58	    } else
59		return __kernel_sindf((hx > 0 ? s2pio2 : -s2pio2) - x);
60	}
61	if(ix<=0x40e231d5) {		/* |x| ~<= 9*pi/4 */
62	    if(ix<=0x40afeddf) {	/* |x| ~<= 7*pi/4 */
63		if(hx>0)
64		    return -__kernel_cosdf(x - s3pio2);
65		else
66		    return __kernel_cosdf(x + s3pio2);
67	    } else
68		return __kernel_sindf(x + (hx > 0 ? -s4pio2 : s4pio2));
69	}
70
71    /* sin(Inf or NaN) is NaN */
72	else if (ix>=0x7f800000) return x-x;
73
74    /* general argument reduction needed */
75	else {
76	    n = __ieee754_rem_pio2f(x,&y);
77	    switch(n&3) {
78		case 0: return  __kernel_sindf(y);
79		case 1: return  __kernel_cosdf(y);
80		case 2: return  __kernel_sindf(-y);
81		default:
82			return -__kernel_cosdf(y);
83	    }
84	}
85}
86