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}; --- 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 */ |
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} |