glibc/sysdeps/ieee754/dbl-64/branred.c
Roland McGrath cc7375ce02 2002-08-26 Brian Youmans <3diff@gnu.org>
* crypt/crypt.c: Changed copying permission notice to Lesser GPL
        from Library GPL.
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        * linuxthreads/pt-machine.c: Likewise.
        * linuxthreads/ptclock_gettime.c: Likewise.
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        * linuxthreads/rwlock.c: Likewise.
        * linuxthreads/sysdeps/alpha/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/alpha/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/arm/pspinlock.c: Likewise.
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        * linuxthreads/sysdeps/cris/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/cris/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/hppa/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/hppa/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/i386/i686/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/i386/pspinlock.c: Likewise.
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        * linuxthreads/sysdeps/i386/useldt.h: Likewise.
        * linuxthreads/sysdeps/ia64/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/ia64/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/m68k/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/m68k/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/mips/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/mips/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/powerpc/pspinlock.c: Likewise.
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        * linuxthreads/sysdeps/pthread/getcpuclockid.c: Likewise.
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        * linuxthreads/sysdeps/pthread/timer_delete.c: Likewise.
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        * linuxthreads/sysdeps/pthread/tst-timer.c: Likewise.
        * linuxthreads/sysdeps/s390/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/s390/s390-32/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/s390/s390-64/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/sh/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/sh/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/sparc/sparc32/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/sparc/sparc32/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/sparc/sparc32/sparcv9/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/sparc/sparc64/pspinlock.c: Likewise.
        * linuxthreads/sysdeps/sparc/sparc64/pt-machine.h: Likewise.
        * linuxthreads/sysdeps/unix/sysv/linux/bits/local_lim.h: Likewise.
        * linuxthreads/sysdeps/unix/sysv/linux/bits/posix_opt.h: Likewise.
        * linuxthreads/sysdeps/unix/sysv/linux/bits/sigthread.h: Likewise.
        * linuxthreads/sysdeps/unix/sysv/linux/hppa/bits/initspin.h: Likewise.
        * linuxthreads/sysdeps/unix/sysv/linux/i386/bits/posix_opt.h: Likewise.
        * linuxthreads/tststack.c: Likewise.
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        * stdlib/gmp-impl.h: Likewise.
        * stdlib/gmp.h: Likewise.
        * sysdeps/generic/dl-iteratephdr-static.c: Likewise.
        * sysdeps/generic/strnlen.c: Likewise.
        * sysdeps/mach/hurd/powerpc/bits/sigcontext.h: Likewise.
        * sysdeps/mach/hurd/recvmsg.c: Likewise.
        * sysdeps/mach/hurd/sendmsg.c: Likewise.
        * sysdeps/mach/hurd/spawni.c: Likewise.
        * sysdeps/mach/powerpc/machine-sp.h: Likewise.
        * sysdeps/mach/powerpc/sysdep.h: Likewise.
        * sysdeps/mach/powerpc/thread_state.h: Likewise.
        * sysdeps/unix/bsd/bsd4.4/bits/socket.h: Likewise.
        * sysdeps/unix/sysv/linux/ia64/dl-iteratephdr-static.c: Likewise.
        * sysdeps/x86_64/gmp-mparam.h: Likewise.
2002-08-26 22:40:48 +00:00

145 lines
4.1 KiB
C

/*
* IBM Accurate Mathematical Library
* Written by International Business Machines Corp.
* Copyright (C) 2001 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*******************************************************************/
/* */
/* MODULE_NAME: branred.c */
/* */
/* FUNCTIONS: branred */
/* */
/* FILES NEEDED: branred.h mydefs.h endian.h mpa.h */
/* mha.c */
/* */
/* Routine branred() performs range reduction of a double number */
/* x into Double length number a+aa,such that */
/* x=n*pi/2+(a+aa), abs(a+aa)<pi/4, n=0,+-1,+-2,.... */
/* Routine returns the integer (n mod 4) of the above description */
/* of x. */
/*******************************************************************/
#include "endian.h"
#include "mydefs.h"
#include "branred.h"
#include "math_private.h"
/*******************************************************************/
/* Routine branred() performs range reduction of a double number */
/* x into Double length number a+aa,such that */
/* x=n*pi/2+(a+aa), abs(a+aa)<pi/4, n=0,+-1,+-2,.... */
/* Routine return integer (n mod 4) */
/*******************************************************************/
int __branred(double x, double *a, double *aa)
{
int i,k;
#if 0
int n;
#endif
mynumber u,gor;
#if 0
mynumber v;
#endif
double r[6],s,t,sum,b,bb,sum1,sum2,b1,bb1,b2,bb2,x1,x2,t1,t2;
x*=tm600.x;
t=x*split; /* split x to two numbers */
x1=t-(t-x);
x2=x-x1;
sum=0;
u.x = x1;
k = (u.i[HIGH_HALF]>>20)&2047;
k = (k-450)/24;
if (k<0)
k=0;
gor.x = t576.x;
gor.i[HIGH_HALF] -= ((k*24)<<20);
for (i=0;i<6;i++)
{ r[i] = x1*toverp[k+i]*gor.x; gor.x *= tm24.x; }
for (i=0;i<3;i++) {
s=(r[i]+big.x)-big.x;
sum+=s;
r[i]-=s;
}
t=0;
for (i=0;i<6;i++)
t+=r[5-i];
bb=(((((r[0]-t)+r[1])+r[2])+r[3])+r[4])+r[5];
s=(t+big.x)-big.x;
sum+=s;
t-=s;
b=t+bb;
bb=(t-b)+bb;
s=(sum+big1.x)-big1.x;
sum-=s;
b1=b;
bb1=bb;
sum1=sum;
sum=0;
u.x = x2;
k = (u.i[HIGH_HALF]>>20)&2047;
k = (k-450)/24;
if (k<0)
k=0;
gor.x = t576.x;
gor.i[HIGH_HALF] -= ((k*24)<<20);
for (i=0;i<6;i++)
{ r[i] = x2*toverp[k+i]*gor.x; gor.x *= tm24.x; }
for (i=0;i<3;i++) {
s=(r[i]+big.x)-big.x;
sum+=s;
r[i]-=s;
}
t=0;
for (i=0;i<6;i++)
t+=r[5-i];
bb=(((((r[0]-t)+r[1])+r[2])+r[3])+r[4])+r[5];
s=(t+big.x)-big.x;
sum+=s;
t-=s;
b=t+bb;
bb=(t-b)+bb;
s=(sum+big1.x)-big1.x;
sum-=s;
b2=b;
bb2=bb;
sum2=sum;
sum=sum1+sum2;
b=b1+b2;
bb = (ABS(b1)>ABS(b2))? (b1-b)+b2 : (b2-b)+b1;
if (b > 0.5)
{b-=1.0; sum+=1.0;}
else if (b < -0.5)
{b+=1.0; sum-=1.0;}
s=b+(bb+bb1+bb2);
t=((b-s)+bb)+(bb1+bb2);
b=s*split;
t1=b-(b-s);
t2=s-t1;
b=s*hp0.x;
bb=(((t1*mp1.x-b)+t1*mp2.x)+t2*mp1.x)+(t2*mp2.x+s*hp1.x+t*hp0.x);
s=b+bb;
t=(b-s)+bb;
*a=s;
*aa=t;
return ((int) sum)&3; /* return quater of unit circle */
}