[PATCH] Fix lgamma*, log10* and log2* results [BZ #21171]

[Joseph Myers]

On Thu, 16 Feb 2017, Tulio Magno Quites Machado Filho wrote:

> lgamma(-x) should return +Inf and raise divide-by-zero.
> log10(+-0) and log2(+-0) should return -Inf and raise divide-by-zero.
> 
> Tested on powerpc, powerpc64, powerpc64le and x86_64.
> 
> 2017-02-16  Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>
> 
> 	[BZ #21171]
> 	* sysdeps/ieee754/dbl-64/e_lgamma_r.c (__ieee754_lgamma_r): Return
> 	+Inf and raise divide-by-zero when x is negative.
> 	* sysdeps/ieee754/flt-32/e_lgammaf_r.c (__ieee754_lgammaf_r): Likewise.
> 	* sysdeps/ieee754/ldbl-128/e_lgammal_r.c (__ieee754_lgammal_r): Likewise.
> 
> 	* sysdeps/ieee754/dbl-64/e_log10.c (__ieee754_log10):  Return
> 	-Inf and raise divide-by-zero when x = +-0.
> 	* sysdeps/ieee754/dbl-64/e_log2.c (__ieee754_log2): Likewise.
> 	* sysdeps/ieee754/flt-32/e_log10f.c (__ieee754_log10f):	Likewise.
> 	* sysdeps/ieee754/flt-32/e_log2f.c (__ieee754_log2f): Likewise.
> 	* sysdeps/ieee754/ldbl-128/e_log10l.c (__ieee754_log10l): Likewise.
> 	* sysdeps/ieee754/ldbl-128/e_log2l.c (__ieee754_log2l): Likewise.
> 	* sysdeps/ieee754/ldbl-128ibm/e_log10l.c (__ieee754_log10l): Likewise.
> 	* sysdeps/ieee754/ldbl-128ibm/e_log2l.c (__ieee754_log2l): Likewise.

OK.

-- 
Joseph S. Myers
joseph@codesourcery.com