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
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fpu	Fix log (1) in round-downward mode (bug 16731).	2014-03-21 18:13:58 +00:00
multiarch
add_n.S
bcopy.S
bzero.S
cacheinfo.c
dl-hash.h
ffs.c
hp-timing.c
hp-timing.h
Implies
Makefile
memcmp.S
memcpy_chk.S
memcpy.S
memmove_chk.S
memmove.S	Fix a thinko/typo in i686's memmove (aka __memmove_ia32).	2014-01-09 09:49:54 +13:00
mempcpy_chk.S
mempcpy.S
memset_chk.S
memset.S
memusage.h
strcmp.S
strtok_r.S
strtok.S
tst-stack-align.h