[Bug libc/16427] test-ldouble and test-ildoubl fail on S/390

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

http://sourceware.org/bugzilla/show_bug.cgi?id=16427

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Fri, 10 Jan 2014, krebbel1 at de dot ibm.com wrote:

> Failure: Test: exp_towardzero (0x1.86ap+16)
> Result:
>  is:          inf   inf
>  should be:   1.18973149535723176508e+4932   0x1.ffffffffffffffffffffp+16383

Overflow of exp in directed rounding modes is bug 16284.  It would also be 
reasonable to have a separate bug for the ldbl-128 case and keep 16284 for 
dbl-64 only, but please name it something referring to ldbl-128 exp in 
that case, and avoid omnibus bugs like "test-ldouble and test-ildoubl 
fail", preferring bugs relating to specific failures of specific functions 
that describe what the issue is for glibc users (i.e. a given function 
does something wrong) rather than in developer terms (a given testcase 
fails).  (Such bugs should also be component "math".)

Given a properly specific bug in component "math", then mark the problem 
tests with xfail-rounding:ldbl-128 and a comment referring to the bug in 
question.

> Failure: Test: expm1_towardzero (0x1.86ap+16)

expm1 overflow failure is just a consequence of exp failure, so the same 
bug.

If there are other functions with bad results not a consequence of this 
exp bug, please file separate bugs for them that identify the specific 
functions concerned.

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