Joseph Myers f7be737659 Fix log (1) in round-downward mode (bug 16731). ... According to ISO C Annex F, log (1) should be +0 in all rounding modes, but some implementations in glibc wrongly return -0 in round-downward mode (mapping to log1p (x - 1) is problematic because 1 - 1 is -0 in round-downward mode, and log1p (-0) is -0). This patch fixes this. (It helps with some implementations of other functions such as acosh, log2 and log10 that call out to log, but not enough to enable all-rounding-modes testing for those functions without further fixes to other implementations of them.) Tested x86_64 and x86 and ulps updated accordingly, and did spot tests for mips64 for the ldbl-128 fix, and i586 for the sysdeps/i386/fpu implementations shadowed by those in sysdeps/i386/i686/fpu. [BZ #16731] * sysdeps/i386/fpu/e_log.S (__ieee754_log): Take absolute value when x - 1 is zero. * sysdeps/i386/fpu/e_logf.S (__ieee754_logf): Likewise. * sysdeps/i386/fpu/e_logl.S (__ieee754_logl): Likewise. * sysdeps/i386/i686/fpu/e_logl.S (__ieee754_logl): Likewise. * sysdeps/ieee754/dbl-64/e_log.c (__ieee754_log): Return +0 when argument is 1. * sysdeps/ieee754/ldbl-128/e_logl.c (__ieee754_logl): Likewise. * sysdeps/x86_64/fpu/e_logl.S: Take absolute value when x - 1 is zero. * math/libm-test.inc (log_test): Use ALL_RM_TEST. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.		2014-03-21 18:13:58 +00:00
..
aarch64	Compile with -Wundef.	2014-03-14 11:32:51 -07:00
alpha	Compile with -Wundef.	2014-03-14 11:32:51 -07:00
arm	Fix -Wundef warnins for __FP_FAST_FMA*	2014-03-21 17:28:43 +05:30
generic	Revert "Fix HP_SMALL_TIMING_AVAIL -Wundef warnings"	2014-03-17 20:39:24 +00:00
gnu	Combine __USE_BSD and __USE_SVID into __USE_MISC.	2014-02-12 23:41:01 +00:00
i386	Fix log (1) in round-downward mode (bug 16731).	2014-03-21 18:13:58 +00:00
ia64	Compile with -Wundef.	2014-03-14 11:32:51 -07:00
ieee754	Fix log (1) in round-downward mode (bug 16731).	2014-03-21 18:13:58 +00:00
init_array	Update copyright notices with scripts/update-copyrights	2014-01-01 22:00:23 +10:00
m68k	Compile with -Wundef.	2014-03-14 11:32:51 -07:00
mach	Compile with -Wundef.	2014-03-14 11:32:51 -07:00
microblaze	Compile with -Wundef.	2014-03-14 11:32:51 -07:00
mips	Compile with -Wundef.	2014-03-14 11:32:51 -07:00
posix	Use glibc_likely instead __builtin_expect.	2014-02-10 15:07:12 +01:00
powerpc	PowerPC: optimized strpbrk for POWER7	2014-03-20 19:46:13 -05:00
pthread	Use glibc_likely instead __builtin_expect.	2014-02-10 15:07:12 +01:00
s390	Don't include individual test ulps in libm-test-ulps.	2014-03-05 15:02:38 +00:00
sh	Don't include individual test ulps in libm-test-ulps.	2014-03-05 15:02:38 +00:00
sparc	Don't include individual test ulps in libm-test-ulps.	2014-03-05 15:02:38 +00:00
tile	Fix -Wundef warnins for __FP_FAST_FMA*	2014-03-21 17:28:43 +05:30
unix	Fix __ASSUME_PREADV and __ASSUME_PWRITEV for Alpha and MicroBlaze (bug 16649).	2014-03-19 13:10:52 +00:00
wordsize-32	Update copyright notices with scripts/update-copyrights	2014-01-01 22:00:23 +10:00
wordsize-64	Update copyright notices with scripts/update-copyrights	2014-01-01 22:00:23 +10:00
x86	Fix -Wundef warnins for __FP_FAST_FMA*	2014-03-21 17:28:43 +05:30
x86_64	Fix log (1) in round-downward mode (bug 16731).	2014-03-21 18:13:58 +00:00