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s_sinf.c (176451) s_sinf.c (176552)
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>
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: head/lib/msun/src/s_sinf.c 176451 2008-02-22 02:30:36Z das $");
18__FBSDID("$FreeBSD: head/lib/msun/src/s_sinf.c 176552 2008-02-25 13:33:20Z bde $");
19
20#include "math.h"
21#define INLINE_KERNEL_COSDF
22#define INLINE_KERNEL_SINDF
23#include "math_private.h"
24#include "k_cosf.c"
25#include "k_sinf.c"
26
27/* Small multiples of pi/2 rounded to double precision. */
28static const double
29s1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */
30s2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */
31s3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */
32s4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
33
34float
35sinf(float x)
36{
19
20#include "math.h"
21#define INLINE_KERNEL_COSDF
22#define INLINE_KERNEL_SINDF
23#include "math_private.h"
24#include "k_cosf.c"
25#include "k_sinf.c"
26
27/* Small multiples of pi/2 rounded to double precision. */
28static const double
29s1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */
30s2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */
31s3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */
32s4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
33
34float
35sinf(float x)
36{
37 float y[2];
37 double y;
38 int32_t n, hx, ix;
39
40 GET_FLOAT_WORD(hx,x);
41 ix = hx & 0x7fffffff;
42
43 if(ix <= 0x3f490fda) { /* |x| ~<= pi/4 */
44 if(ix<0x39800000) /* |x| < 2**-12 */
45 if(((int)x)==0) return x; /* x with inexact if x != 0 */

--- 18 unchanged lines hidden (view full) ---

64 return __kernel_sindf(x + (hx > 0 ? -s4pio2 : s4pio2));
65 }
66
67 /* sin(Inf or NaN) is NaN */
68 else if (ix>=0x7f800000) return x-x;
69
70 /* general argument reduction needed */
71 else {
38 int32_t n, hx, ix;
39
40 GET_FLOAT_WORD(hx,x);
41 ix = hx & 0x7fffffff;
42
43 if(ix <= 0x3f490fda) { /* |x| ~<= pi/4 */
44 if(ix<0x39800000) /* |x| < 2**-12 */
45 if(((int)x)==0) return x; /* x with inexact if x != 0 */

--- 18 unchanged lines hidden (view full) ---

64 return __kernel_sindf(x + (hx > 0 ? -s4pio2 : s4pio2));
65 }
66
67 /* sin(Inf or NaN) is NaN */
68 else if (ix>=0x7f800000) return x-x;
69
70 /* general argument reduction needed */
71 else {
72 n = __ieee754_rem_pio2f(x,y);
72 n = __ieee754_rem_pio2f(x,&y);
73 switch(n&3) {
73 switch(n&3) {
74 case 0: return __kernel_sindf((double)y[0]+y[1]);
75 case 1: return __kernel_cosdf((double)y[0]+y[1]);
76 case 2: return __kernel_sindf(-(double)y[0]-y[1]);
74 case 0: return __kernel_sindf(y);
75 case 1: return __kernel_cosdf(y);
76 case 2: return __kernel_sindf(-y);
77 default:
77 default:
78 return -__kernel_cosdf((double)y[0]+y[1]);
78 return -__kernel_cosdf(y);
79 }
80 }
81}
79 }
80 }
81}