mirror of
https://sourceware.org/git/glibc.git
synced 2025-01-12 20:20:18 +00:00
88283451b2
Various implementations of frexp functions return sNaN for sNaN input. This patch fixes them to add such arguments to themselves so that qNaN is returned. Tested for x86_64, x86, mips64 and powerpc. [BZ #20250] * sysdeps/i386/fpu/s_frexpl.S (__frexpl): Add non-finite input to itself. * sysdeps/ieee754/dbl-64/s_frexp.c (__frexp): Add non-finite or zero input to itself. * sysdeps/ieee754/dbl-64/wordsize-64/s_frexp.c (__frexp): Likewise. * sysdeps/ieee754/flt-32/s_frexpf.c (__frexpf): Likewise. * sysdeps/ieee754/ldbl-128/s_frexpl.c (__frexpl): Likewise. * sysdeps/ieee754/ldbl-128ibm/s_frexpl.c (__frexpl): Likewise. * sysdeps/ieee754/ldbl-96/s_frexpl.c (__frexpl): Likewise. * math/libm-test.inc (frexp_test_data): Add sNaN tests.
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/* s_frexpl.c -- long double version of s_frexp.c.
|
|
* Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
|
|
*/
|
|
|
|
/*
|
|
* ====================================================
|
|
* 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
|
|
|
|
/*
|
|
* for non-zero x
|
|
* x = frexpl(arg,&exp);
|
|
* return a long double fp quantity x such that 0.5 <= |x| <1.0
|
|
* and the corresponding binary exponent "exp". That is
|
|
* arg = x*2^exp.
|
|
* If arg is inf, 0.0, or NaN, then frexpl(arg,&exp) returns arg
|
|
* with *exp=0.
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
|
|
static const long double
|
|
two114 = 2.0769187434139310514121985316880384E+34L; /* 0x4071000000000000, 0 */
|
|
|
|
long double __frexpl(long double x, int *eptr)
|
|
{
|
|
u_int64_t hx, lx, ix;
|
|
GET_LDOUBLE_WORDS64(hx,lx,x);
|
|
ix = 0x7fffffffffffffffULL&hx;
|
|
*eptr = 0;
|
|
if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x + x;/* 0,inf,nan */
|
|
if (ix<0x0001000000000000ULL) { /* subnormal */
|
|
x *= two114;
|
|
GET_LDOUBLE_MSW64(hx,x);
|
|
ix = hx&0x7fffffffffffffffULL;
|
|
*eptr = -114;
|
|
}
|
|
*eptr += (ix>>48)-16382;
|
|
hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL;
|
|
SET_LDOUBLE_MSW64(x,hx);
|
|
return x;
|
|
}
|
|
weak_alias (__frexpl, frexpl)
|