mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 07:10:06 +00:00
76da726532
[BZ #6794] Following Joseph comments about bug 6794, here is a proposed fix. It turned out to be a large fix mainly because I had to move some file along to follow libm files/names conventions. Basically I have added wrappers (w_ilogb.c, w_ilogbf.c, w_ilogbl.c) that now calls the symbol '__ieee754_ilogb'. The wrappers checks for '__ieee754_ilogb' output and set the errno and raise exceptions as expected. The '__ieee754_ilogb' is implemented in sysdeps. I have moved the 's_ilogb[f|l]' files to e_ilogb[f|l] and renamed the '__ilogb[f|l]' to '__ieee754_ilogb[f|l]'. I also found out a bug in i386 and x86-64 assembly coded ilogb implementation where it raises a FE_DIVBYZERO when argument is '0.0'. I corrected this issue as well. Finally I added the errno and FE_INVALID tests for 0.0, NaN and +-InF argument. Tested on i386, x86-64, ppc32 and ppc64.
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/* Copyright (C) 2012 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Adhemerval Zanella <azanella@linux.vnet.ibm.com>, 2011.
|
|
|
|
The GNU C Library 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.
|
|
|
|
The GNU C Library 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 the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <math.h>
|
|
#include <errno.h>
|
|
#include <math_private.h>
|
|
|
|
/* wrapper ilogb */
|
|
int
|
|
__ilogb (double x)
|
|
{
|
|
int r = __ieee754_ilogb (x);
|
|
if (__builtin_expect (r == FP_ILOGB0, 0)
|
|
|| __builtin_expect (r == FP_ILOGBNAN, 0)
|
|
|| __builtin_expect (r == INT_MAX, 0))
|
|
{
|
|
__set_errno (EDOM);
|
|
feraiseexcept (FE_INVALID);
|
|
}
|
|
return r;
|
|
}
|
|
|
|
weak_alias (__ilogb, ilogb)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__ilogb, __ilogbl)
|
|
weak_alias (__ilogb, ilogbl)
|
|
#endif
|