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[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.
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This file is part of the GNU C Library.
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Contributed by Adhemerval Zanella <azanella@linux.vnet.ibm.com>, 2011.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <math.h>
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#include <errno.h>
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#include <math_private.h>
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/* wrapper ilogb */
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int
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__ilogb (double x)
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{
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int r = __ieee754_ilogb (x);
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if (__builtin_expect (r == FP_ILOGB0, 0)
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|| __builtin_expect (r == FP_ILOGBNAN, 0)
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|| __builtin_expect (r == INT_MAX, 0))
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{
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__set_errno (EDOM);
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feraiseexcept (FE_INVALID);
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}
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return r;
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}
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weak_alias (__ilogb, ilogb)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__ilogb, __ilogbl)
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weak_alias (__ilogb, ilogbl)
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#endif
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