w_scalb.c - vx32 - Local 9vx git repository for patches.
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       ---
       w_scalb.c (1294B)
       ---
            1 /* @(#)w_scalb.c 5.1 93/09/24 */
            2 /*
            3  * ====================================================
            4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
            5  *
            6  * Developed at SunPro, a Sun Microsystems, Inc. business.
            7  * Permission to use, copy, modify, and distribute this
            8  * software is freely granted, provided that this notice
            9  * is preserved.
           10  * ====================================================
           11  */
           12 
           13 #ifndef lint
           14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_scalb.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
           15 #endif
           16 
           17 /*
           18  * wrapper scalb(double x, double fn) is provide for
           19  * passing various standard test suite. One
           20  * should use scalbn() instead.
           21  */
           22 
           23 #include "math.h"
           24 #include "math_private.h"
           25 
           26 #include <errno.h>
           27 
           28 #ifdef _SCALB_INT
           29 double
           30 scalb(double x, int fn)                /* wrapper scalb */
           31 #else
           32 double
           33 scalb(double x, double fn)        /* wrapper scalb */
           34 #endif
           35 {
           36 #ifdef _IEEE_LIBM
           37         return __ieee754_scalb(x,fn);
           38 #else
           39         double z;
           40         z = __ieee754_scalb(x,fn);
           41         if(_LIB_VERSION == _IEEE_) return z;
           42         if(!(finite(z)||isnan(z))&&finite(x)) {
           43             return __kernel_standard(x,(double)fn,32); /* scalb overflow */
           44         }
           45         if(z==0.0&&z!=x) {
           46             return __kernel_standard(x,(double)fn,33); /* scalb underflow */
           47         }
           48 #ifndef _SCALB_INT
           49         if(!finite(fn)) errno = ERANGE;
           50 #endif
           51         return z;
           52 #endif
           53 }