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New test to expose erroneous negative sign on logb(1) (bug 887).

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This commit is contained in:
Ryan S. Arnold 2012-04-27 10:47:39 -05:00
parent 6ad3493e22
commit a462cb6332
3 changed files with 56 additions and 14 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2012-04-27 Ryan S. Arnold <rsa@linux.vnet.ibm.com>
[BZ #887]
* math/libm-test.inc (logb_test_downward): New test to expose
erroneous negative sign on -0.0 result of logb[l](1) in FE_DOWNWARD
rounding mode.
2012-04-27 Joseph Myers <joseph@codesourcery.com> 2012-04-27 Joseph Myers <joseph@codesourcery.com>
[BZ #14027] [BZ #14027]

28
NEWS
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@ -9,20 +9,20 @@ Version 2.16
* The following bugs are resolved with this release: * The following bugs are resolved with this release:
174, 350, 369, 411, 706, 2074, 2541, 2547, 2548, 2551, 2552, 2553, 2554, 174, 350, 369, 411, 887, 706, 2074, 2541, 2547, 2548, 2551, 2552, 2553,
2562, 2563, 2565, 2566, 2576, 2636, 2678, 3335, 3768, 3866, 3868, 3976, 2554, 2562, 2563, 2565, 2566, 2576, 2636, 2678, 3335, 3768, 3866, 3868,
3992, 4026, 4108, 4596, 4822, 5077, 5461, 5805, 5993, 6471, 6486, 6578, 3976, 3992, 4026, 4108, 4596, 4822, 5077, 5461, 5805, 5993, 6471, 6486,
6649, 6730, 6770, 6794, 6884, 6890, 6894, 6895, 6907, 6911, 7064, 9739, 6578, 6649, 6730, 6770, 6794, 6884, 6890, 6894, 6895, 6907, 6911, 7064,
9902, 10110, 10135, 10140, 10153, 10210, 10254, 10346, 10545, 10716, 9739, 9902, 10110, 10135, 10140, 10153, 10210, 10254, 10346, 10545,
11174, 11322, 11365, 11451, 11494, 11521, 11959, 12047, 12340, 13058, 10716, 11174, 11322, 11365, 11451, 11494, 11521, 11959, 12047, 12340,
13525, 13526, 13527, 13528, 13529, 13530, 13531, 13532, 13533, 13547, 13058, 13525, 13526, 13527, 13528, 13529, 13530, 13531, 13532, 13533,
13551, 13552, 13553, 13555, 13559, 13566, 13583, 13592, 13618, 13637, 13547, 13551, 13552, 13553, 13555, 13559, 13566, 13583, 13592, 13618,
13656, 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13726, 13738, 13637, 13656, 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13726,
13739, 13760, 13761, 13786, 13792, 13806, 13824, 13840, 13841, 13844, 13738, 13739, 13760, 13761, 13786, 13792, 13806, 13824, 13840, 13841,
13846, 13851, 13852, 13854, 13871, 13872, 13873, 13879, 13883, 13886, 13844, 13846, 13851, 13852, 13854, 13871, 13872, 13873, 13879, 13883,
13892, 13895, 13908, 13910, 13911, 13912, 13913, 13915, 13916, 13917, 13886, 13892, 13895, 13908, 13910, 13911, 13912, 13913, 13915, 13916,
13918, 13919, 13920, 13921, 13926, 13927, 13928, 13938, 13963, 13967, 13917, 13918, 13919, 13920, 13921, 13926, 13927, 13928, 13938, 13963,
13970, 13973, 14027 13967, 13970, 13973, 14027
* ISO C11 support: * ISO C11 support:

35
math/libm-test.inc
View File

@ -5101,6 +5101,40 @@ logb_test (void)
END (logb); END (logb);
} }
static void
logb_test_downward (void)
{
int save_round_mode;
errno = 0;
FUNC(logb) (0);
if (errno == ENOSYS)
/* Function not implemented. */
return;
START (logb_downward);
save_round_mode = fegetround ();
if (!fesetround (FE_DOWNWARD))
{
/* IEEE 754-2008 says (section 5.3.3) that "logB(1) is +0.". Libm
should not return -0 from logb in any rounding mode. PowerPC32 has
failed with this test for power4 logb (and logbl on all PowerPC
platforms) in the past due to instruction selection. GCC PR 52775
provides the availability of the fcfid insn in 32-bit mode which
eliminates the use of fsub in this instance and prevents the negative
signed 0.0. */
/* BZ #887 .*/
TEST_f_f (logb, 1.000e+0, plus_zero);
}
fesetround (save_round_mode);
END (logb_downward);
}
static void static void
lround_test (void) lround_test (void)
@ -8210,6 +8244,7 @@ main (int argc, char **argv)
log1p_test (); log1p_test ();
log2_test (); log2_test ();
logb_test (); logb_test ();
logb_test_downward ();
modf_test (); modf_test ();
ilogb_test (); ilogb_test ();
scalb_test (); scalb_test ();