mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-09 23:00:07 +00:00
Fix exp10 spurious overflows (bug 13924).
This commit is contained in:
parent
6c1ff08cf8
commit
9568c0c225
15
ChangeLog
15
ChangeLog
@ -1,3 +1,18 @@
|
||||
2012-04-30 Joseph Myers <joseph@codesourcery.com>
|
||||
|
||||
[BZ #13884]
|
||||
[BZ #13924]
|
||||
* math/e_exp10.c: Include <float.h>.
|
||||
(__ieee754_exp10): Handle underflow here rather than multiplying
|
||||
large negative argument by M_LN10.
|
||||
* math/e_exp10f.c (__ieee754_exp10f): Call __ieee754_exp instead
|
||||
of __ieee754_expf.
|
||||
* math/e_exp10l.c: Include <float.h>.
|
||||
(__ieee754_exp10l): Handle underflow here rather than multiplying
|
||||
large negative argument by M_LN10l.
|
||||
* math/libm-test.inc (exp10_test): Add another test. Do not allow
|
||||
spurious overflow exception on underflow.
|
||||
|
||||
2012-04-29 Marek Polacek <polacek@redhat.com>
|
||||
|
||||
* misc/sys/cdefs.h (__attribute_artificial__): New macro.
|
||||
|
4
NEWS
4
NEWS
@ -21,8 +21,8 @@ Version 2.16
|
||||
13739, 13758, 13760, 13761, 13786, 13792, 13806, 13824, 13840, 13841,
|
||||
13844, 13846, 13851, 13852, 13854, 13871, 13872, 13873, 13879, 13883,
|
||||
13886, 13892, 13895, 13908, 13910, 13911, 13912, 13913, 13915, 13916,
|
||||
13917, 13918, 13919, 13920, 13921, 13926, 13927, 13928, 13938, 13941,
|
||||
13963, 13967, 13970, 13973, 14027, 14033
|
||||
13917, 13918, 13919, 13920, 13921, 13924, 13926, 13927, 13928, 13938,
|
||||
13941, 13963, 13967, 13970, 13973, 14027, 14033
|
||||
|
||||
* ISO C11 support:
|
||||
|
||||
|
@ -1,4 +1,4 @@
|
||||
/* Copyright (C) 1998, 2011 Free Software Foundation, Inc.
|
||||
/* Copyright (C) 1998-2012 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
|
||||
|
||||
@ -18,13 +18,16 @@
|
||||
|
||||
#include <math.h>
|
||||
#include <math_private.h>
|
||||
|
||||
#include <float.h>
|
||||
|
||||
double
|
||||
__ieee754_exp10 (double arg)
|
||||
{
|
||||
/* This is a very stupid and inprecise implementation. It'll get
|
||||
replaced sometime (soon?). */
|
||||
return __ieee754_exp (M_LN10 * arg);
|
||||
if (__finite (arg) && arg < DBL_MIN_10_EXP - DBL_DIG - 10)
|
||||
return DBL_MIN * DBL_MIN;
|
||||
else
|
||||
/* This is a very stupid and inprecise implementation. It'll get
|
||||
replaced sometime (soon?). */
|
||||
return __ieee754_exp (M_LN10 * arg);
|
||||
}
|
||||
strong_alias (__ieee754_exp10, __exp10_finite)
|
||||
|
@ -1,4 +1,4 @@
|
||||
/* Copyright (C) 1998, 2011 Free Software Foundation, Inc.
|
||||
/* Copyright (C) 1998-2012 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
|
||||
|
||||
@ -23,8 +23,10 @@
|
||||
float
|
||||
__ieee754_exp10f (float arg)
|
||||
{
|
||||
/* This is a very stupid and inprecise implementation. It'll get
|
||||
replaced sometime (soon?). */
|
||||
return __ieee754_expf (M_LN10 * arg);
|
||||
/* The argument to exp needs to be calculated in enough precision
|
||||
that the fractional part has as much precision as float, in
|
||||
addition to the bits in the integer part; using double ensures
|
||||
this. */
|
||||
return __ieee754_exp (M_LN10 * arg);
|
||||
}
|
||||
strong_alias (__ieee754_exp10f, __exp10f_finite)
|
||||
|
@ -1,4 +1,4 @@
|
||||
/* Copyright (C) 1998, 2011 Free Software Foundation, Inc.
|
||||
/* Copyright (C) 1998-2012 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
|
||||
|
||||
@ -18,13 +18,16 @@
|
||||
|
||||
#include <math.h>
|
||||
#include <math_private.h>
|
||||
|
||||
#include <float.h>
|
||||
|
||||
long double
|
||||
__ieee754_exp10l (long double arg)
|
||||
{
|
||||
/* This is a very stupid and inprecise implementation. It'll get
|
||||
replaced sometime (soon?). */
|
||||
return __ieee754_expl (M_LN10l * arg);
|
||||
if (__finitel (arg) && arg < LDBL_MIN_10_EXP - LDBL_DIG - 10)
|
||||
return LDBL_MIN * LDBL_MIN;
|
||||
else
|
||||
/* This is a very stupid and inprecise implementation. It'll get
|
||||
replaced sometime (soon?). */
|
||||
return __ieee754_expl (M_LN10l * arg);
|
||||
}
|
||||
strong_alias (__ieee754_exp10l, __exp10l_finite)
|
||||
|
@ -3196,12 +3196,14 @@ exp10_test (void)
|
||||
TEST_f_f (exp10, nan_value, nan_value);
|
||||
TEST_f_f (exp10, 3, 1000);
|
||||
TEST_f_f (exp10, -1, 0.1L);
|
||||
#ifdef TEST_FLOAT /* Bug 13884: inaccurate results except for float. */
|
||||
TEST_f_f (exp10, 36, 1.0e36L);
|
||||
#endif
|
||||
TEST_f_f (exp10, 1e6, plus_infty, OVERFLOW_EXCEPTION);
|
||||
TEST_f_f (exp10, -1e6, 0);
|
||||
#ifndef TEST_LDOUBLE /* Bug 13914: spurious exceptions. */
|
||||
TEST_f_f (exp10, max_value, plus_infty, OVERFLOW_EXCEPTION);
|
||||
/* Bug 13924: spurious OVERFLOW exception may be present. */
|
||||
TEST_f_f (exp10, -max_value, 0, OVERFLOW_EXCEPTION_OK);
|
||||
TEST_f_f (exp10, -max_value, 0);
|
||||
#endif
|
||||
TEST_f_f (exp10, 0.75L, 5.62341325190349080394951039776481231L);
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user