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
