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 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
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};

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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 */
148 n = __kernel_rem_pio2(tx,y,e0,nx,2);
149 if(hx<0) {y[0] = -y[0]; y[1] = -y[1]; return -n;}
150 return n;
151}