diff options
| author | Joseph Myers <joseph@codesourcery.com> | 2014-01-02 16:33:06 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2014-01-02 16:33:06 +0000 |
| commit | 396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6 (patch) | |
| tree | ec6423e6d30d9344e775ce5d6011a60306eb99d2 | |
| parent | 6c8dbf00f536d78b1937b5af6f57be47fd376344 (diff) | |
| download | glibc-396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6.tar.gz glibc-396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6.tar.xz glibc-396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6.zip | |
Fix ldbl-128ibm acoshl inaccuracy (bug 16384).
This patch fixes bug 16384, ldbl-128ibm acoshl inaccuracy, which showed up while attempting to regenerate ulps for powerpc-nofpu for 2.19. There were two separate problems, use of __log1p instead of __log1pl and an insufficiently accurate constant value for log 2 (which this patch replaces by use of M_LN2l), each of which could cause substantial inaccuracy in affected cases. Tested for powerpc-nofpu. * sysdeps/ieee754/ldbl-128ibm/e_acoshl.c (ln2): Initialize with M_LN2l. (__ieee754_acoshl): Use __log1pl not __log1p.
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | NEWS | 2 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/e_acoshl.c | 4 |
3 files changed, 10 insertions, 3 deletions
diff --git a/ChangeLog b/ChangeLog index cb91ca7ede..4fae701843 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,10 @@ +2014-01-02 Joseph Myers <joseph@codesourcery.com> + + [BZ #16384] + * sysdeps/ieee754/ldbl-128ibm/e_acoshl.c (ln2): Initialize with + M_LN2l. + (__ieee754_acoshl): Use __log1pl not __log1p. + 2013-01-02 Ondřej Bílka <neleai@seznam.cz> * malloc/arena.c (malloc_atfork, free_atfork, ptmalloc_lock_all, diff --git a/NEWS b/NEWS index 47ab1217de..c53be8aeba 100644 --- a/NEWS +++ b/NEWS @@ -23,7 +23,7 @@ Version 2.19 16038, 16041, 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144, 16146, 16150, 16151, 16153, 16167, 16172, 16195, 16214, 16245, 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, - 16338, 16356, 16365, 16366, 16369, 16372, 16375, 16379. + 16338, 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16384. * Slovenian translations for glibc messages have been contributed by the Translation Project's Slovenian team of translators. diff --git a/sysdeps/ieee754/ldbl-128ibm/e_acoshl.c b/sysdeps/ieee754/ldbl-128ibm/e_acoshl.c index 8a4a5bb7b9..b0b33f7520 100644 --- a/sysdeps/ieee754/ldbl-128ibm/e_acoshl.c +++ b/sysdeps/ieee754/ldbl-128ibm/e_acoshl.c @@ -29,7 +29,7 @@ static const long double one = 1.0L, -ln2 = 6.93147180559945286227e-01L; /* 0x3FE62E42, 0xFEFA39EF */ +ln2 = M_LN2l; long double __ieee754_acoshl(long double x) @@ -56,7 +56,7 @@ __ieee754_acoshl(long double x) return __ieee754_logl(2.0*x-one/(x+__ieee754_sqrtl(t-one))); } else { /* 1<x<2 */ t = x-one; - return __log1p(t+__ieee754_sqrtl(2.0*t+t*t)); + return __log1pl(t+__ieee754_sqrtl(2.0*t+t*t)); } } strong_alias (__ieee754_acoshl, __acoshl_finite) |