[Bug math/16423] math-float, math-double failing logb_downward test with negative/positive zero difference on ppc32

["joseph at codesourcery dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=16423

--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Thu, 9 Jan 2014, brooks at gcc dot gnu.org wrote:

> I'm seeing failures in both math/test-float and math/test-double, with
> essentially identical test-*.out outputs.  The contents of test-float.out are
> included below.  This bug report is for the logb_downward failure (which is
> that it's producing a negative zero where it should be producing a positive
> zero); I've filed the llrint failure separately.

The reason for bug 887 being closed was spurious (and it should not have 
been listed in NEWS as fixed for 2.16).  There was a GCC fix only for more 
recent Power processors.  I think the bug should probably be kept open for 
the point that glibc should work around the GCC bug (conditionally on a 
configure test for whether the code generated needs it, i.e. that it uses 
the problem arithmetic operations without modifying the rounding mode 
temporarily).  In addition, a GCC bug should be filed in GCC Bugzilla, if 
not already open, for the bad code generation for these conversions with 
-frounding-math.

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