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| author | Joseph Myers <joseph@codesourcery.com> | 2014-05-23 12:07:50 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2014-05-23 12:07:50 +0000 |
| commit | b72592e75fdecb34e2ac5f931730409a1fb68e8a (patch) | |
| tree | 9a7f71aecd06da02f507abf536a72a1bcbd69209 /NEWS | |
| parent | 2302d679ce8b36854022207b58e554b3e89dd8c7 (diff) | |
| download | glibc-b72592e75fdecb34e2ac5f931730409a1fb68e8a.tar.gz glibc-b72592e75fdecb34e2ac5f931730409a1fb68e8a.tar.xz glibc-b72592e75fdecb34e2ac5f931730409a1fb68e8a.zip | |
Fix log10 (1) in round-downward mode (bug 16977).
As with various other issues of this kind, bug 16977 is log10 (1) wrongly returning -0 rather than +0 in round-downward mode because of an implementation effectively in terms of log1p (x - 1). This patch fixes the issue in the same way used for log. Tested x86_64 and x86 and ulps updated accordingly. Also tested for mips64 to confirm a fix was needed for ldbl-128 and to validate that fix (also applied to ldbl-128ibm since that version of logl is essentially the same as the ldbl-128 one). [BZ #16977] * sysdeps/i386/fpu/e_log10.S (__ieee754_log10): Take absolute value when x - 1 is zero. * sysdeps/i386/fpu/e_log10f.S (__ieee754_log10f): Likewise. * sysdeps/i386/fpu/e_log10l.S (__ieee754_log10l): Likewise. * sysdeps/ieee754/ldbl-128/e_log10l.c (__ieee754_log10l): Return 0.0L for an argument of 1.0L. * sysdeps/ieee754/ldbl-128ibm/e_log10l.c (__ieee754_log10l): Likewise. * sysdeps/x86_64/fpu/e_log10l.S (__ieee754_log10l): Take absolute value when x - 1 is zero. * math/libm-test.inc (log10_test): Use ALL_RM_TEST. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/NEWS b/NEWS index 8aaf2f4cb5..1c44fd6e2d 100644 --- a/NEWS +++ b/NEWS @@ -18,7 +18,7 @@ Version 2.20 16760, 16770, 16786, 16789, 16791, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16849, 16854, 16876, 16877, 16885, 16888, 16890, 16912, 16915, 16916, 16917, 16922, 16927, 16928, 16932, 16943, 16958, 16966, - 16967, 16965. + 16967, 16965, 16977. * The minimum Linux kernel version that this version of the GNU C Library can be used with is 2.6.32. |