Re: [testsuite] Compile gfortran.dg/fmt_g0_6.f08 with -ffloat-store [fwd: tobias.burnus@physik.fu-berlin.de]

[Jerry DeLisle <jvdelisle@frontier.com>]

On 05/03/2011 03:14 AM, Tobias Burnus wrote:
> Rainer,
>
> Rainer Orth wrote:
>> Jerry DeLisle wrote:
>>> This is OK.  We are working on a solution, so maybe it would be better to
>>> XFAIL it so that when it does get fixed it will be flagged. It also fails
>>> on i686-pc-gnu.
>>
>> is this a solution for this particular case or for the general need to
>> sometimes use -ffloat-store?  In the former case, I'd agree, in the
>> latter it's probably better to consistently use -ffloat-store in the
>> testcases and review those uses once a solution is in place.
>
> I think the issue is PR 48602 - wrong I/O output due to wrong rounding
> and algorithm bugs. The PR has been mostly fixed, but the excess
> precision of the x87 processor still causes failures. One solution
> might be to compile the whole libgfortran/io/ with
> -fexcess-precision=standard. Adding a single
> "asm volatile ("" : "+m" (temp))" proved to be insufficient.
>
> Tobias
>
> PS: Especially as you are listed as testsuite maintainer, I would be
> happy if you could comment on the testsuite patch at
> http://gcc.gnu.org/ml/fortran/2011-04/msg00331.html
>

My goal is to completely not use any floating point operations for that section 
of code.  We have a concept on how to do it.  I am still working out tweaks to 
48787, then I will turn my attention to this. Feel free to quiet that test case 
any way you wish in the meantime.

Jerry