Joseph Myers f8ba1b5654 Fix log2 (1) in round-downward mode (bug 17042). ... As with other issues of this kind, bug 17042 is log2 (1) wrongly returning -0 instead of +0 in round-downward mode because of implementations effectively in terms of log1p (x - 1). This patch fixes the issue in the same way used for log and log10. 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 log2l is essentially the same as the ldbl-128 one). [BZ #17042] * sysdeps/i386/fpu/e_log2.S (__ieee754_log2): Take absolete value when x - 1 is zero. * sysdeps/i386/fpu/e_log2f.S (__ieee754_log2f): Likewise. * sysdeps/i386/fpu/e_log2l.S (__ieee754_log2l): Likewise. * sysdeps/ieee754/ldbl-128/e_log2l.c (__ieee754_log2l): Return 0.0L for an argument of 1.0L. * sysdeps/ieee754/ldbl-128ibm/e_log2l.c (__ieee754_log2l): Likewise. * sysdeps/x86_64/fpu/e_log2l.S (__ieee754_log2l): Take absolute value when x - 1 is zero. * math/libm-test.inc (log2_test): Use ALL_RM_TEST. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.		2014-06-10 12:07:15 +00:00
..
bits
dbl-64
flt-32	Fix excessive ULP for y1_upward (0x2p+0) in test-float and test-ifloat.	2014-05-31 20:05:00 -07:00
ldbl-64-128
ldbl-96	Fix acosh (1) in round-downward mode (bug 16927).	2014-05-14 12:35:40 +00:00
ldbl-128	Fix log2 (1) in round-downward mode (bug 17042).	2014-06-10 12:07:15 +00:00
ldbl-128ibm	Fix log2 (1) in round-downward mode (bug 17042).	2014-06-10 12:07:15 +00:00
ldbl-opt
ieee754.h
k_standard.c
Makefile
s_lib_version.c
s_matherr.c
s_signgam.c
support.c