Remove unused file sysdeps/ieee754/support.c

1 files changed, 0 insertions, 520 deletions

diff --git a/sysdeps/ieee754/support.c b/sysdeps/ieee754/support.c
deleted file mode 100644
index 00476c0ed9..0000000000
--- a/sysdeps/ieee754/support.c
+++ /dev/null
@@ -1,520 +0,0 @@
-/*
- * Copyright (c) 1985, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#ifndef lint
-static char sccsid[] = "@(#)support.c	8.1 (Berkeley) 6/4/93";
-#endif /* not lint */
-
-/*
- * Some IEEE standard 754 recommended functions and remainder and sqrt for
- * supporting the C elementary functions.
- ******************************************************************************
- * WARNING:
- *      These codes are developed (in double) to support the C elementary
- * functions temporarily. They are not universal, and some of them are very
- * slow (in particular, drem and sqrt is extremely inefficient). Each
- * computer system should have its implementation of these functions using
- * its own assembler.
- ******************************************************************************
- *
- * IEEE 754 required operations:
- *     drem(x,p)
- *              returns  x REM y  =  x - [x/y]*y , where [x/y] is the integer
- *              nearest x/y; in half way case, choose the even one.
- *     sqrt(x)
- *              returns the square root of x correctly rounded according to
- *		the rounding mod.
- *
- * IEEE 754 recommended functions:
- * (a) copysign(x,y)
- *              returns x with the sign of y.
- * (b) scalb(x,N)
- *              returns  x * (2**N), for integer values N.
- * (c) logb(x)
- *              returns the unbiased exponent of x, a signed integer in
- *              double precision, except that logb(0) is -INF, logb(INF)
- *              is +INF, and logb(NAN) is that NAN.
- * (d) finite(x)
- *              returns the value TRUE if -INF < x < +INF and returns
- *              FALSE otherwise.
- *
- *
- * CODED IN C BY K.C. NG, 11/25/84;
- * REVISED BY K.C. NG on 1/22/85, 2/13/85, 3/24/85.
- */
-
-#include "mathimpl.h"
-
-#if defined(vax)||defined(tahoe)      /* VAX D format */
-#include <errno.h>
-    static const unsigned short msign=0x7fff , mexp =0x7f80 ;
-    static const short  prep1=57, gap=7, bias=129           ;
-    static const double novf=1.7E38, nunf=3.0E-39, zero=0.0 ;
-#else	/* defined(vax)||defined(tahoe) */
-    static const unsigned short msign=0x7fff, mexp =0x7ff0  ;
-    static const short prep1=54, gap=4, bias=1023           ;
-    static const double novf=1.7E308, nunf=3.0E-308,zero=0.0;
-#endif	/* defined(vax)||defined(tahoe) */
-
-double scalb(x,N)
-double x; int N;
-{
-        int k;
-
-#ifdef national
-        unsigned short *px=(unsigned short *) &x + 3;
-#else	/* national */
-        unsigned short *px=(unsigned short *) &x;
-#endif	/* national */
-
-        if( x == zero )  return(x);
-
-#if defined(vax)||defined(tahoe)
-        if( (k= *px & mexp ) != ~msign ) {
-            if (N < -260)
-		return(nunf*nunf);
-	    else if (N > 260) {
-		return(copysign(infnan(ERANGE),x));
-	    }
-#else	/* defined(vax)||defined(tahoe) */
-        if( (k= *px & mexp ) != mexp ) {
-            if( N<-2100) return(nunf*nunf); else if(N>2100) return(novf+novf);
-            if( k == 0 ) {
-                 x *= scalb(1.0,(int)prep1);  N -= prep1; return(scalb(x,N));}
-#endif	/* defined(vax)||defined(tahoe) */
-
-            if((k = (k>>gap)+ N) > 0 )
-                if( k < (mexp>>gap) ) *px = (*px&~mexp) | (k<<gap);
-                else x=novf+novf;               /* overflow */
-            else
-                if( k > -prep1 )
-                                        /* gradual underflow */
-                    {*px=(*px&~mexp)|(short)(1<<gap); x *= scalb(1.0,k-1);}
-                else
-                return(nunf*nunf);
-            }
-        return(x);
-}
-
-
-double copysign(x,y)
-double x,y;
-{
-#ifdef national
-        unsigned short  *px=(unsigned short *) &x+3,
-                        *py=(unsigned short *) &y+3;
-#else	/* national */
-        unsigned short  *px=(unsigned short *) &x,
-                        *py=(unsigned short *) &y;
-#endif	/* national */
-
-#if defined(vax)||defined(tahoe)
-        if ( (*px & mexp) == 0 ) return(x);
-#endif	/* defined(vax)||defined(tahoe) */
-
-        *px = ( *px & msign ) | ( *py & ~msign );
-        return(x);
-}
-
-double logb(x)
-double x;
-{
-
-#ifdef national
-        short *px=(short *) &x+3, k;
-#else	/* national */
-        short *px=(short *) &x, k;
-#endif	/* national */
-
-#if defined(vax)||defined(tahoe)
-        return (int)(((*px&mexp)>>gap)-bias);
-#else	/* defined(vax)||defined(tahoe) */
-        if( (k= *px & mexp ) != mexp )
-            if ( k != 0 )
-                return ( (k>>gap) - bias );
-            else if( x != zero)
-                return ( -1022.0 );
-            else
-                return(-(1.0/zero));
-        else if(x != x)
-            return(x);
-        else
-            {*px &= msign; return(x);}
-#endif	/* defined(vax)||defined(tahoe) */
-}
-
-finite(x)
-double x;
-{
-#if defined(vax)||defined(tahoe)
-        return(1);
-#else	/* defined(vax)||defined(tahoe) */
-#ifdef national
-        return( (*((short *) &x+3 ) & mexp ) != mexp );
-#else	/* national */
-        return( (*((short *) &x ) & mexp ) != mexp );
-#endif	/* national */
-#endif	/* defined(vax)||defined(tahoe) */
-}
-
-double drem(x,p)
-double x,p;
-{
-        short sign;
-        double hp,dp,tmp;
-        unsigned short  k;
-#ifdef national
-        unsigned short
-              *px=(unsigned short *) &x  +3,
-              *pp=(unsigned short *) &p  +3,
-              *pd=(unsigned short *) &dp +3,
-              *pt=(unsigned short *) &tmp+3;
-#else	/* national */
-        unsigned short
-              *px=(unsigned short *) &x  ,
-              *pp=(unsigned short *) &p  ,
-              *pd=(unsigned short *) &dp ,
-              *pt=(unsigned short *) &tmp;
-#endif	/* national */
-
-        *pp &= msign ;
-
-#if defined(vax)||defined(tahoe)
-        if( ( *px & mexp ) == ~msign )	/* is x a reserved operand? */
-#else	/* defined(vax)||defined(tahoe) */
-        if( ( *px & mexp ) == mexp )
-#endif	/* defined(vax)||defined(tahoe) */
-		return  (x-p)-(x-p);	/* create nan if x is inf */
-	if (p == zero) {
-#if defined(vax)||defined(tahoe)
-		return(infnan(EDOM));
-#else	/* defined(vax)||defined(tahoe) */
-		return zero/zero;
-#endif	/* defined(vax)||defined(tahoe) */
-	}
-
-#if defined(vax)||defined(tahoe)
-        if( ( *pp & mexp ) == ~msign )	/* is p a reserved operand? */
-#else	/* defined(vax)||defined(tahoe) */
-        if( ( *pp & mexp ) == mexp )
-#endif	/* defined(vax)||defined(tahoe) */
-		{ if (p != p) return p; else return x;}
-
-        else  if ( ((*pp & mexp)>>gap) <= 1 )
-                /* subnormal p, or almost subnormal p */
-            { double b; b=scalb(1.0,(int)prep1);
-              p *= b; x = drem(x,p); x *= b; return(drem(x,p)/b);}
-        else  if ( p >= novf/2)
-            { p /= 2 ; x /= 2; return(drem(x,p)*2);}
-        else
-            {
-                dp=p+p; hp=p/2;
-                sign= *px & ~msign ;
-                *px &= msign       ;
-                while ( x > dp )
-                    {
-                        k=(*px & mexp) - (*pd & mexp) ;
-                        tmp = dp ;
-                        *pt += k ;
-
-#if defined(vax)||defined(tahoe)
-                        if( x < tmp ) *pt -= 128 ;
-#else	/* defined(vax)||defined(tahoe) */
-                        if( x < tmp ) *pt -= 16 ;
-#endif	/* defined(vax)||defined(tahoe) */
-
-                        x -= tmp ;
-                    }
-                if ( x > hp )
-                    { x -= p ;  if ( x >= hp ) x -= p ; }
-
-#if defined(vax)||defined(tahoe)
-		if (x)
-#endif	/* defined(vax)||defined(tahoe) */
-			*px ^= sign;
-                return( x);
-
-            }
-}
-
-
-double sqrt(x)
-double x;
-{
-        double q,s,b,r;
-        double t;
-	double const zero=0.0;
-        int m,n,i;
-#if defined(vax)||defined(tahoe)
-        int k=54;
-#else	/* defined(vax)||defined(tahoe) */
-        int k=51;
-#endif	/* defined(vax)||defined(tahoe) */
-
-    /* sqrt(NaN) is NaN, sqrt(+-0) = +-0 */
-        if(x!=x||x==zero) return(x);
-
-    /* sqrt(negative) is invalid */
-        if(x<zero) {
-#if defined(vax)||defined(tahoe)
-		return (infnan(EDOM));	/* NaN */
-#else	/* defined(vax)||defined(tahoe) */
-		return(zero/zero);
-#endif	/* defined(vax)||defined(tahoe) */
-	}
-
-    /* sqrt(INF) is INF */
-        if(!finite(x)) return(x);
-
-    /* scale x to [1,4) */
-        n=logb(x);
-        x=scalb(x,-n);
-        if((m=logb(x))!=0) x=scalb(x,-m);       /* subnormal number */
-        m += n;
-        n = m/2;
-        if((n+n)!=m) {x *= 2; m -=1; n=m/2;}
-
-    /* generate sqrt(x) bit by bit (accumulating in q) */
-            q=1.0; s=4.0; x -= 1.0; r=1;
-            for(i=1;i<=k;i++) {
-                t=s+1; x *= 4; r /= 2;
-                if(t<=x) {
-                    s=t+t+2, x -= t; q += r;}
-                else
-                    s *= 2;
-                }
-
-    /* generate the last bit and determine the final rounding */
-            r/=2; x *= 4;
-            if(x==zero) goto end; 100+r; /* trigger inexact flag */
-            if(s<x) {
-                q+=r; x -=s; s += 2; s *= 2; x *= 4;
-                t = (x-s)-5;
-                b=1.0+3*r/4; if(b==1.0) goto end; /* b==1 : Round-to-zero */
-                b=1.0+r/4;   if(b>1.0) t=1;	/* b>1 : Round-to-(+INF) */
-                if(t>=0) q+=r; }	      /* else: Round-to-nearest */
-            else {
-                s *= 2; x *= 4;
-                t = (x-s)-1;
-                b=1.0+3*r/4; if(b==1.0) goto end;
-                b=1.0+r/4;   if(b>1.0) t=1;
-                if(t>=0) q+=r; }
-
-end:        return(scalb(q,n));
-}
-
-#if 0
-/* DREM(X,Y)
- * RETURN X REM Y =X-N*Y, N=[X/Y] ROUNDED (ROUNDED TO EVEN IN THE HALF WAY CASE)
- * DOUBLE PRECISION (VAX D format 56 bits, IEEE DOUBLE 53 BITS)
- * INTENDED FOR ASSEMBLY LANGUAGE
- * CODED IN C BY K.C. NG, 3/23/85, 4/8/85.
- *
- * Warning: this code should not get compiled in unless ALL of
- * the following machine-dependent routines are supplied.
- *
- * Required machine dependent functions (not on a VAX):
- *     swapINX(i): save inexact flag and reset it to "i"
- *     swapENI(e): save inexact enable and reset it to "e"
- */
-
-double drem(x,y)
-double x,y;
-{
-
-#ifdef national		/* order of words in floating point number */
-	static const n0=3,n1=2,n2=1,n3=0;
-#else /* VAX, SUN, ZILOG, TAHOE */
-	static const n0=0,n1=1,n2=2,n3=3;
-#endif
-
-	static const unsigned short mexp =0x7ff0, m25 =0x0190, m57 =0x0390;
-	static const double zero=0.0;
-	double hy,y1,t,t1;
-	short k;
-	long n;
-	int i,e;
-	unsigned short xexp,yexp, *px  =(unsigned short *) &x  ,
-			nx,nf,	  *py  =(unsigned short *) &y  ,
-			sign,	  *pt  =(unsigned short *) &t  ,
-				  *pt1 =(unsigned short *) &t1 ;
-
-	xexp = px[n0] & mexp ;	/* exponent of x */
-	yexp = py[n0] & mexp ;	/* exponent of y */
-	sign = px[n0] &0x8000;	/* sign of x     */
-
-/* return NaN if x is NaN, or y is NaN, or x is INF, or y is zero */
-	if(x!=x) return(x); if(y!=y) return(y);	     /* x or y is NaN */
-	if( xexp == mexp )   return(zero/zero);      /* x is INF */
-	if(y==zero) return(y/y);
-
-/* save the inexact flag and inexact enable in i and e respectively
- * and reset them to zero
- */
-	i=swapINX(0);	e=swapENI(0);
-
-/* subnormal number */
-	nx=0;
-	if(yexp==0) {t=1.0,pt[n0]+=m57; y*=t; nx=m57;}
-
-/* if y is tiny (biased exponent <= 57), scale up y to y*2**57 */
-	if( yexp <= m57 ) {py[n0]+=m57; nx+=m57; yexp+=m57;}
-
-	nf=nx;
-	py[n0] &= 0x7fff;
-	px[n0] &= 0x7fff;
-
-/* mask off the least significant 27 bits of y */
-	t=y; pt[n3]=0; pt[n2]&=0xf800; y1=t;
-
-/* LOOP: argument reduction on x whenever x > y */
-loop:
-	while ( x > y )
-	{
-	    t=y;
-	    t1=y1;
-	    xexp=px[n0]&mexp;	  /* exponent of x */
-	    k=xexp-yexp-m25;
-	    if(k>0) 	/* if x/y >= 2**26, scale up y so that x/y < 2**26 */
-		{pt[n0]+=k;pt1[n0]+=k;}
-	    n=x/t; x=(x-n*t1)-n*(t-t1);
-	}
-    /* end while (x > y) */
-
-	if(nx!=0) {t=1.0; pt[n0]+=nx; x*=t; nx=0; goto loop;}
-
-/* final adjustment */
-
-	hy=y/2.0;
-	if(x>hy||((x==hy)&&n%2==1)) x-=y;
-	px[n0] ^= sign;
-	if(nf!=0) { t=1.0; pt[n0]-=nf; x*=t;}
-
-/* restore inexact flag and inexact enable */
-	swapINX(i); swapENI(e);
-
-	return(x);
-}
-#endif
-
-#if 0
-/* SQRT
- * RETURN CORRECTLY ROUNDED (ACCORDING TO THE ROUNDING MODE) SQRT
- * FOR IEEE DOUBLE PRECISION ONLY, INTENDED FOR ASSEMBLY LANGUAGE
- * CODED IN C BY K.C. NG, 3/22/85.
- *
- * Warning: this code should not get compiled in unless ALL of
- * the following machine-dependent routines are supplied.
- *
- * Required machine dependent functions:
- *     swapINX(i)  ...return the status of INEXACT flag and reset it to "i"
- *     swapRM(r)   ...return the current Rounding Mode and reset it to "r"
- *     swapENI(e)  ...return the status of inexact enable and reset it to "e"
- *     addc(t)     ...perform t=t+1 regarding t as a 64 bit unsigned integer
- *     subc(t)     ...perform t=t-1 regarding t as a 64 bit unsigned integer
- */
-
-static const unsigned long table[] = {
-0, 1204, 3062, 5746, 9193, 13348, 18162, 23592, 29598, 36145, 43202, 50740,
-58733, 67158, 75992, 85215, 83599, 71378, 60428, 50647, 41945, 34246, 27478,
-21581, 16499, 12183, 8588, 5674, 3403, 1742, 661, 130, };
-
-double newsqrt(x)
-double x;
-{
-        double y,z,t,addc(),subc()
-	double const b54=134217728.*134217728.; /* b54=2**54 */
-        long mx,scalx;
-	long const mexp=0x7ff00000;
-        int i,j,r,e,swapINX(),swapRM(),swapENI();
-        unsigned long *py=(unsigned long *) &y   ,
-                      *pt=(unsigned long *) &t   ,
-                      *px=(unsigned long *) &x   ;
-#ifdef national         /* ordering of word in a floating point number */
-        const int n0=1, n1=0;
-#else
-        const int n0=0, n1=1;
-#endif
-/* Rounding Mode:  RN ...round-to-nearest
- *                 RZ ...round-towards 0
- *                 RP ...round-towards +INF
- *		   RM ...round-towards -INF
- */
-        const int RN=0,RZ=1,RP=2,RM=3;
-				/* machine dependent: work on a Zilog Z8070
-                                 * and a National 32081 & 16081
-                                 */
-
-/* exceptions */
-	if(x!=x||x==0.0) return(x);  /* sqrt(NaN) is NaN, sqrt(+-0) = +-0 */
-	if(x<0) return((x-x)/(x-x)); /* sqrt(negative) is invalid */
-        if((mx=px[n0]&mexp)==mexp) return(x);  /* sqrt(+INF) is +INF */
-
-/* save, reset, initialize */
-        e=swapENI(0);   /* ...save and reset the inexact enable */
-        i=swapINX(0);   /* ...save INEXACT flag */
-        r=swapRM(RN);   /* ...save and reset the Rounding Mode to RN */
-        scalx=0;
-
-/* subnormal number, scale up x to x*2**54 */
-        if(mx==0) {x *= b54 ; scalx-=0x01b00000;}
-
-/* scale x to avoid intermediate over/underflow:
- * if (x > 2**512) x=x/2**512; if (x < 2**-512) x=x*2**512 */
-        if(mx>0x5ff00000) {px[n0] -= 0x20000000; scalx+= 0x10000000;}
-        if(mx<0x1ff00000) {px[n0] += 0x20000000; scalx-= 0x10000000;}
-
-/* magic initial approximation to almost 8 sig. bits */
-        py[n0]=(px[n0]>>1)+0x1ff80000;
-        py[n0]=py[n0]-table[(py[n0]>>15)&31];
-
-/* Heron's rule once with correction to improve y to almost 18 sig. bits */
-        t=x/y; y=y+t; py[n0]=py[n0]-0x00100006; py[n1]=0;
-
-/* triple to almost 56 sig. bits; now y approx. sqrt(x) to within 1 ulp */
-        t=y*y; z=t;  pt[n0]+=0x00100000; t+=z; z=(x-z)*y;
-        t=z/(t+x) ;  pt[n0]+=0x00100000; y+=t;
-
-/* twiddle last bit to force y correctly rounded */
-        swapRM(RZ);     /* ...set Rounding Mode to round-toward-zero */
-        swapINX(0);     /* ...clear INEXACT flag */
-        swapENI(e);     /* ...restore inexact enable status */
-        t=x/y;          /* ...chopped quotient, possibly inexact */
-        j=swapINX(i);   /* ...read and restore inexact flag */
-        if(j==0) { if(t==y) goto end; else t=subc(t); }  /* ...t=t-ulp */
-        b54+0.1;        /* ..trigger inexact flag, sqrt(x) is inexact */
-        if(r==RN) t=addc(t);            /* ...t=t+ulp */
-        else if(r==RP) { t=addc(t);y=addc(y);}/* ...t=t+ulp;y=y+ulp; */
-        y=y+t;                          /* ...chopped sum */
-        py[n0]=py[n0]-0x00100000;       /* ...correctly rounded sqrt(x) */
-end:    py[n0]=py[n0]+scalx;            /* ...scale back y */
-        swapRM(r);                      /* ...restore Rounding Mode */
-        return(y);
-}
-#endif