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e_rem_pio2.c (141296) e_rem_pio2.c (176356)
1
2/* @(#)e_rem_pio2.c 1.4 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
10 * is preserved.
11 * ====================================================
12 *
13 */
14
15#ifndef lint
1
2/* @(#)e_rem_pio2.c 1.4 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
10 * is preserved.
11 * ====================================================
12 *
13 */
14
15#ifndef lint
16static char rcsid[] = "$FreeBSD: head/lib/msun/src/e_rem_pio2.c 141296 2005-02-04 18:26:06Z das $";
16static char rcsid[] = "$FreeBSD: head/lib/msun/src/e_rem_pio2.c 176356 2008-02-17 07:31:59Z das $";
17#endif
18
19/* __ieee754_rem_pio2(x,y)
20 *
21 * return the remainder of x rem pi/2 in y[0]+y[1]
22 * use __kernel_rem_pio2()
23 */
24
25#include "math.h"
26#include "math_private.h"
27
17#endif
18
19/* __ieee754_rem_pio2(x,y)
20 *
21 * return the remainder of x rem pi/2 in y[0]+y[1]
22 * use __kernel_rem_pio2()
23 */
24
25#include "math.h"
26#include "math_private.h"
27
28/*
29 * Table of constants for 2/pi, 396 Hex digits (476 decimal) of 2/pi
30 */
31static const int32_t two_over_pi[] = {
320xA2F983, 0x6E4E44, 0x1529FC, 0x2757D1, 0xF534DD, 0xC0DB62,
330x95993C, 0x439041, 0xFE5163, 0xABDEBB, 0xC561B7, 0x246E3A,
340x424DD2, 0xE00649, 0x2EEA09, 0xD1921C, 0xFE1DEB, 0x1CB129,
350xA73EE8, 0x8235F5, 0x2EBB44, 0x84E99C, 0x7026B4, 0x5F7E41,
360x3991D6, 0x398353, 0x39F49C, 0x845F8B, 0xBDF928, 0x3B1FF8,
370x97FFDE, 0x05980F, 0xEF2F11, 0x8B5A0A, 0x6D1F6D, 0x367ECF,
380x27CB09, 0xB74F46, 0x3F669E, 0x5FEA2D, 0x7527BA, 0xC7EBE5,
390xF17B3D, 0x0739F7, 0x8A5292, 0xEA6BFB, 0x5FB11F, 0x8D5D08,
400x560330, 0x46FC7B, 0x6BABF0, 0xCFBC20, 0x9AF436, 0x1DA9E3,
410x91615E, 0xE61B08, 0x659985, 0x5F14A0, 0x68408D, 0xFFD880,
420x4D7327, 0x310606, 0x1556CA, 0x73A8C9, 0x60E27B, 0xC08C6B,
43};
44
45static const int32_t npio2_hw[] = {
460x3FF921FB, 0x400921FB, 0x4012D97C, 0x401921FB, 0x401F6A7A, 0x4022D97C,
470x4025FDBB, 0x402921FB, 0x402C463A, 0x402F6A7A, 0x4031475C, 0x4032D97C,
480x40346B9C, 0x4035FDBB, 0x40378FDB, 0x403921FB, 0x403AB41B, 0x403C463A,
490x403DD85A, 0x403F6A7A, 0x40407E4C, 0x4041475C, 0x4042106C, 0x4042D97C,
500x4043A28C, 0x40446B9C, 0x404534AC, 0x4045FDBB, 0x4046C6CB, 0x40478FDB,
510x404858EB, 0x404921FB,
52};

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

157 SET_HIGH_WORD(z, ix - ((int32_t)(e0<<20)));
158 for(i=0;i<2;i++) {
159 tx[i] = (double)((int32_t)(z));
160 z = (z-tx[i])*two24;
161 }
162 tx[2] = z;
163 nx = 3;
164 while(tx[nx-1]==zero) nx--; /* skip zero term */
28static const int32_t npio2_hw[] = {
290x3FF921FB, 0x400921FB, 0x4012D97C, 0x401921FB, 0x401F6A7A, 0x4022D97C,
300x4025FDBB, 0x402921FB, 0x402C463A, 0x402F6A7A, 0x4031475C, 0x4032D97C,
310x40346B9C, 0x4035FDBB, 0x40378FDB, 0x403921FB, 0x403AB41B, 0x403C463A,
320x403DD85A, 0x403F6A7A, 0x40407E4C, 0x4041475C, 0x4042106C, 0x4042D97C,
330x4043A28C, 0x40446B9C, 0x404534AC, 0x4045FDBB, 0x4046C6CB, 0x40478FDB,
340x404858EB, 0x404921FB,
35};

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

140 SET_HIGH_WORD(z, ix - ((int32_t)(e0<<20)));
141 for(i=0;i<2;i++) {
142 tx[i] = (double)((int32_t)(z));
143 z = (z-tx[i])*two24;
144 }
145 tx[2] = z;
146 nx = 3;
147 while(tx[nx-1]==zero) nx--; /* skip zero term */
165 n = __kernel_rem_pio2(tx,y,e0,nx,2,two_over_pi);
148 n = __kernel_rem_pio2(tx,y,e0,nx,2);
166 if(hx<0) {y[0] = -y[0]; y[1] = -y[1]; return -n;}
167 return n;
168}
149 if(hx<0) {y[0] = -y[0]; y[1] = -y[1]; return -n;}
150 return n;
151}