glibc/sysdeps/ieee754/ldbl-96/s_scalbnl.c
Ulrich Drepper 4c49989e41 Update.
2002-06-13  Stephen L Moshier  <steve@moshier.net>

	* sysdeps/ieee754/ldbl-96/s_scalbnl.c: Fix cases in which
	argument or result is subnormal.

2002-06-19  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/i386/fpu/s_remquo.S: Fix three mistakes in computing the
	quotient.
	* sysdeps/i386/fpu/s_remquof.S: Likewise.
	* sysdeps/i386/fpu/s_remquol.S: Likewise.

	* sysdeps/hppa/dl-machine.h: Don't use multi-line string literals.

	* sysdeps/unix/sysv/linux/alpha/sendfile64.c: New file.
	* sysdeps/unix/sysv/linux/ia64/sendfile64.c: New file.
	* sysdeps/unix/sysv/linux/sparc/sparc64/sendfile64.c: New file.
	* sysdeps/unix/sysv/linux/x86_64/sendfile64.c: New file.
2002-06-20 07:23:23 +00:00

72 lines
1.9 KiB
C

/* s_scalbnl.c -- long double version of s_scalbn.c.
* Conversion to long double by Ulrich Drepper,
* Cygnus Support, drepper@cygnus.com.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: $";
#endif
/*
* scalbnl (long double x, int n)
* scalbnl(x,n) returns x* 2**n computed by exponent
* manipulation rather than by actually performing an
* exponentiation or a multiplication.
*/
#include "math.h"
#include "math_private.h"
#ifdef __STDC__
static const long double
#else
static long double
#endif
two64 = 1.8446744073709551616e19L,
twom64 = 5.421010862427522170037e-20L,
huge = 1.0e+4900L,
tiny = 1.0e-4900L;
#ifdef __STDC__
long double __scalbnl (long double x, int n)
#else
long double __scalbnl (x,n)
long double x; int n;
#endif
{
int32_t k,es,hx,lx;
GET_LDOUBLE_WORDS(es,hx,lx,x);
k = es&0x7fff; /* extract exponent */
if (k==0) { /* 0 or subnormal x */
if ((lx|(hx&0x7fffffff))==0) return x; /* +-0 */
x *= two64;
GET_LDOUBLE_EXP(hx,x);
k = (hx&0x7fff) - 64;
}
if (k==0x7fff) return x+x; /* NaN or Inf */
k = k+n;
if (n> 50000 || k > 0x7ffe)
return huge*__copysignl(huge,x); /* overflow */
if (n< -50000)
return tiny*__copysignl(tiny,x);
if (k > 0) /* normal result */
{SET_LDOUBLE_EXP(x,(es&0x8000)|k); return x;}
if (k <= -64)
return tiny*__copysignl(tiny,x); /*underflow*/
k += 64; /* subnormal result */
SET_LDOUBLE_EXP(x,(es&0x8000)|k);
return x*twom64;
}
weak_alias (__scalbnl, scalbnl)