[committed] Handle targets with 2 byte wchar_t better in strlenopt-58.c

[Jeff Law]

On 12/5/18 11:59 AM, David Edelsohn wrote:
> Jeff,
> 
> Thanks for the patch.
> 
> I continue to see a failure on AIX 32 bit mode (2 byte wchar).
> 
> FAIL: gcc.dg/strlenopt-58.c scan-tree-dump-times optimized
> "call_in_true_branch_not_eliminated" 0
> 
> I'm not certain if this is AIX-specific or more fallout from wchar
> size.  I could ignore with target powerpc-ibm-aix* or with target !
> 4byte_wchar_t.
> 
> Any further insight / preference?
I didn't try to address that specific failure yet -- my patch just fixed
two earlier warnings.

That specific failure either requires a deeper testsuite fix for
possibly even a fix to the compiler -- I haven't really analyzed it yet
(it's a failure to optimize issue and I've generally avoided looking at
those).


You could xfail it on 4byte_wchar_t.


jeff