[Fortran, Patch] Memory sync after coarray image control statements and assignment

Matthew Wahab matthew.wahab@foss.arm.com
Mon Dec 7 14:09:00 GMT 2015


On 07/12/15 10:06, Tobias Burnus wrote:
> I wrote:
>> I wonder whether using
>>
>> __asm__ __volatile__ ("":::"memory");
>>
>> would be sufficient as it has a way lower overhead than
>> __sync_synchronize().
>
> Namely, something like the attached patch.
>
> Regarding the original patch submission: Is there a reason that you didn't
> include the test case of Deepak from https://gcc.gnu.org/ml/fortran/2015-04/msg00062.html
> It should work as -fcoarray=lib -lcaf_single "dg-do run" test.
>
> Tobias
>

I don't know anything about Fortran or coarrays and I'm curious whether this affects 
architectures with weak memory models. Is the barrier only needed to stop reordering 
by the compiler or is does it also need to stop reordering by the hardware?

Matthew




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