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k_tanf.c (97413) k_tanf.c (129981)
1/* k_tanf.c -- float version of k_tan.c
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
1/* k_tanf.c -- float version of k_tan.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.
7 * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved.
8 *
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
9 * Permission to use, copy, modify, and distribute this
10 * software is freely granted, provided that this notice
11 * is preserved.
12 * ====================================================
13 */
14
15#ifndef lint
17static char rcsid[] = "$FreeBSD: head/lib/msun/src/k_tanf.c 97413 2002-05-28 18:15:04Z alfred $";
16static char rcsid[] = "$FreeBSD: head/lib/msun/src/k_tanf.c 129981 2004-06-02 04:39:44Z das $";
18#endif
19
20#include "math.h"
21#include "math_private.h"
22static const float
23one = 1.0000000000e+00, /* 0x3f800000 */
24pio4 = 7.8539812565e-01, /* 0x3f490fda */
25pio4lo= 3.7748947079e-08, /* 0x33222168 */

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

41
42float
43__kernel_tanf(float x, float y, int iy)
44{
45 float z,r,v,w,s;
46 int32_t ix,hx;
47 GET_FLOAT_WORD(hx,x);
48 ix = hx&0x7fffffff; /* high word of |x| */
17#endif
18
19#include "math.h"
20#include "math_private.h"
21static const float
22one = 1.0000000000e+00, /* 0x3f800000 */
23pio4 = 7.8539812565e-01, /* 0x3f490fda */
24pio4lo= 3.7748947079e-08, /* 0x33222168 */

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

40
41float
42__kernel_tanf(float x, float y, int iy)
43{
44 float z,r,v,w,s;
45 int32_t ix,hx;
46 GET_FLOAT_WORD(hx,x);
47 ix = hx&0x7fffffff; /* high word of |x| */
49 if(ix<0x31800000) /* x < 2**-28 */
50 {if((int)x==0) { /* generate inexact */
51 if((ix|(iy+1))==0) return one/fabsf(x);
52 else return (iy==1)? x: -one/x;
53 }
54 }
48 if(ix<0x31800000) { /* x < 2**-28 */
49 if ((int) x == 0) { /* generate inexact */
50 if ((ix | (iy + 1)) == 0)
51 return one / fabsf(x);
52 else {
53 if (iy == 1)
54 return x;
55 else { /* compute -1 / (x+y) carefully */
56 double a, t;
57
58 z = w = x + y;
59 GET_FLOAT_WORD(ix, z);
60 SET_FLOAT_WORD(z, ix & 0xfffff000);
61 v = y - (z - x);
62 t = a = -one / w;
63 GET_FLOAT_WORD(ix, t);
64 SET_FLOAT_WORD(t, ix & 0xfffff000);
65 s = one + t * z;
66 return t + a * (s + t * v);
67 }
68 }
69 }
70 }
55 if(ix>=0x3f2ca140) { /* |x|>=0.6744 */
56 if(hx<0) {x = -x; y = -y;}
57 z = pio4-x;
58 w = pio4lo-y;
59 x = z+w; y = 0.0;
60 }
61 z = x*x;
62 w = z*z;

--- 31 unchanged lines hidden --- 		71 if(ix>=0x3f2ca140) { /* |x|>=0.6744 */
72 if(hx<0) {x = -x; y = -y;}
73 z = pio4-x;
74 w = pio4lo-y;
75 x = z+w; y = 0.0;
76 }
77 z = x*x;
78 w = z*z;

--- 31 unchanged lines hidden ---