ipiq: Add simple IPI latency measure sysctls (2)
[dragonfly.git] / lib / libm / src / s_sinf.c
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  * $FreeBSD: head/lib/msun/src/s_sinf.c 176569 2008-02-25 22:19:17Z bde $
17  */
18
19 #include <float.h>
20
21 #include "math.h"
22 #define INLINE_KERNEL_COSDF
23 #define INLINE_KERNEL_SINDF
24 #define INLINE_REM_PIO2F
25 #include "math_private.h"
26 #include "e_rem_pio2f.c"
27 #include "k_cosf.c"
28 #include "k_sinf.c"
29
30 /* Small multiples of pi/2 rounded to double precision. */
31 static const double
32 s1pio2 = 1*M_PI_2,                      /* 0x3FF921FB, 0x54442D18 */
33 s2pio2 = 2*M_PI_2,                      /* 0x400921FB, 0x54442D18 */
34 s3pio2 = 3*M_PI_2,                      /* 0x4012D97C, 0x7F3321D2 */
35 s4pio2 = 4*M_PI_2;                      /* 0x401921FB, 0x54442D18 */
36
37 float
38 sinf(float x)
39 {
40         double y;
41         int32_t n, hx, ix;
42
43         GET_FLOAT_WORD(hx,x);
44         ix = hx & 0x7fffffff;
45
46         if(ix <= 0x3f490fda) {          /* |x| ~<= pi/4 */
47             if(ix<0x39800000)           /* |x| < 2**-12 */
48                 if(((int)x)==0) return x;       /* x with inexact if x != 0 */
49             return __kernel_sindf(x);
50         }
51         if(ix<=0x407b53d1) {            /* |x| ~<= 5*pi/4 */
52             if(ix<=0x4016cbe3) {        /* |x| ~<= 3pi/4 */
53                 if(hx>0)
54                     return __kernel_cosdf(x - s1pio2);
55                 else
56                     return -__kernel_cosdf(x + s1pio2);
57             } else
58                 return __kernel_sindf((hx > 0 ? s2pio2 : -s2pio2) - x);
59         }
60         if(ix<=0x40e231d5) {            /* |x| ~<= 9*pi/4 */
61             if(ix<=0x40afeddf) {        /* |x| ~<= 7*pi/4 */
62                 if(hx>0)
63                     return -__kernel_cosdf(x - s3pio2);
64                 else
65                     return __kernel_cosdf(x + s3pio2);
66             } else
67                 return __kernel_sindf(x + (hx > 0 ? -s4pio2 : s4pio2));
68         }
69
70     /* sin(Inf or NaN) is NaN */
71         else if (ix>=0x7f800000) return x-x;
72
73     /* general argument reduction needed */
74         else {
75             n = __ieee754_rem_pio2f(x,&y);
76             switch(n&3) {
77                 case 0: return  __kernel_sindf(y);
78                 case 1: return  __kernel_cosdf(y);
79                 case 2: return  __kernel_sindf(-y);
80                 default:
81                         return -__kernel_cosdf(y);
82             }
83         }
84 }