1/* s_sinf.c -- float version of s_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
| 1/* s_sinf.c -- float version of s_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
|
17static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_sinf.c 152540 2005-11-17 03:53:22Z bde $";
| 17static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_sinf.c 152596 2005-11-19 02:38:27Z bde $";
|
18#endif
19
20#include "math.h"
21#include "math_private.h"
22
| 18#endif
19
20#include "math.h"
21#include "math_private.h"
22
|
| 23/* Small multiples of pi/2 rounded to double precision. */
24static const double
25s1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */
26s2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */
27s3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */
28s4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
29
30static inline float
31__kernel_cosdf(double x)
32{
33 return __kernel_cosf((float)x, x - (float)x);
34}
35
36static inline float
37__kernel_sindf(double x)
38{
39 return __kernel_sinf((float)x, x - (float)x, 1);
40}
41
|
23float
24sinf(float x)
25{
26 float y[2];
| 42float
43sinf(float x)
44{
45 float y[2];
|
27 int32_t n, ix;
| 46 int32_t n, hx, ix;
|
28
| 47
|
29 GET_FLOAT_WORD(ix,x);
30 ix &= 0x7fffffff;
| 48 GET_FLOAT_WORD(hx,x);
49 ix = hx & 0x7fffffff;
|
31
32 if(ix <= 0x3f490fda) { /* |x| ~<= pi/4 */
33 if(ix<0x39800000) /* |x| < 2**-12 */
34 if(((int)x)==0) return x; /* x with inexact if x != 0 */
35 return __kernel_sinf(x,0.0,0);
36 }
| 50
51 if(ix <= 0x3f490fda) { /* |x| ~<= pi/4 */
52 if(ix<0x39800000) /* |x| < 2**-12 */
53 if(((int)x)==0) return x; /* x with inexact if x != 0 */
54 return __kernel_sinf(x,0.0,0);
55 }
|
| 56 if(ix<=0x407b53d1) { /* |x| <= ~5*pi/4 */
57 if(ix<=0x4016cbe3) { /* |x| <= ~3pi/4 */
58 if(hx>0)
59 return __kernel_cosdf(x - s1pio2);
60 else
61 return -__kernel_cosdf(x + s1pio2);
62 } else
63 return -__kernel_sindf(x + (hx > 0 ? -s2pio2 : s2pio2));
64 }
65 if(ix<=0x40e231d5) { /* |x| <= ~9*pi/4 */
66 if(ix<=0x40afeddf) { /* |x| <= ~7*pi/4 */
67 if(hx>0)
68 return -__kernel_cosdf(x - s3pio2);
69 else
70 return __kernel_cosdf(x + s3pio2);
71 } else
72 return __kernel_sindf(x + (hx > 0 ? -s4pio2 : s4pio2));
73 }
|
37
38 /* sin(Inf or NaN) is NaN */
39 else if (ix>=0x7f800000) return x-x;
40
| 74
75 /* sin(Inf or NaN) is NaN */
76 else if (ix>=0x7f800000) return x-x;
77
|
41 /* argument reduction needed */
| 78 /* general argument reduction needed */
|
42 else {
43 n = __ieee754_rem_pio2f(x,y);
44 switch(n&3) {
45 case 0: return __kernel_sinf(y[0],y[1],1);
46 case 1: return __kernel_cosf(y[0],y[1]);
47 case 2: return -__kernel_sinf(y[0],y[1],1);
48 default:
49 return -__kernel_cosf(y[0],y[1]);
50 }
51 }
52}
| 79 else {
80 n = __ieee754_rem_pio2f(x,y);
81 switch(n&3) {
82 case 0: return __kernel_sinf(y[0],y[1],1);
83 case 1: return __kernel_cosf(y[0],y[1]);
84 case 2: return -__kernel_sinf(y[0],y[1],1);
85 default:
86 return -__kernel_cosf(y[0],y[1]);
87 }
88 }
89}
|