On Thu, Aug 25, 2022 at 04:54:51PM +0200, Tobias Burnus wrote:
> Technically, this patch is stand alone, but conceptually it based on the
> submitted but not reviewed patch:
> "[Patch] OpenMP: Support reverse offload (middle end part)"
> https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598662.html
>
> With that patch, for reverse offloads ('omp target device(ancestor:1)'),
> calls like the following are added:
> GOMP_target_ext (-2 /* initial device */, omp_fn.1
> where 'omp_fn.1' on nonhost devices a stub function just required for
> looking up the host function pointer via the offload_funcs table.
>
> The attached patch prepare for reverse-offload device->host
> function-address lookup by requesting (if needed) the on-device address.
>
> OK for mainline?
>
> Tobias
>
>
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> libgomp: Prepare for reverse offload fn lookup
>
> Prepare for reverse-offloading function-pointer lookup by passing
> a rev_fn_table argument to GOMP_OFFLOAD_load_image.
>
> The argument will be NULL, unless GOMP_REQUIRES_REVERSE_OFFLOAD is
> requested and devices not supported it, are filtered out.
> (Up to and including this commit, no non-host device claims such
> support and the caller currently always passes NULL.)
>
> libgomp/ChangeLog:
>
> * libgomp-plugin.h (GOMP_OFFLOAD_load_image): Add
> 'uint64_t **rev_fn_table' argument.
> * oacc-host.c (host_load_image): Likewise.
> * plugin/plugin-gcn.c (GOMP_OFFLOAD_load_image): Likewise;
> currently unused.
> * plugin/plugin-nvptx.c (GOMP_OFFLOAD_load_image): Likewise.
> * target.c (gomp_load_image_to_device): Update call but pass
> NULL for now.
>
> liboffloadmic/ChangeLog:
>
> * plugin/libgomp-plugin-intelmic.cpp (GOMP_OFFLOAD_load_image):
> Add (unused) uint64_t **rev_fn_table argument.
Ok, thanks.
Jakub
