If a loop has only one break case, Metal appears to re-order it to after
the loop ends, which goes against the expected behavior for reconvergence.
Work around this by putting the break statement into a trivial, always-true
runtime conditional, when maximal reconvergence is requested.
Fixes dEQP-VK.reconvergence.maximal.compute.nesting*
Reviewed-by: Arcady Goldmints-Orlov <arcady@lunarg.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41229>
Metal does not seem to respect memory coherency for threads. Workaround 6
enforces device coherency for global loads/stores even if it should not
be needed.
Reviewed-by: Arcady Goldmints-Orlov <arcady@lunarg.com>
Signed-off-by: Aitor Camacho <aitor@lunarg.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38847>
Metal will prematurely discard fragments with side effects even if those
side effects happen before the discard. Work around this by making said
discards "optional".
Reviewed-by: Arcady Goldmints-Orlov <arcady@lunarg.com>
Signed-off-by: Aitor Camacho <aitor@lunarg.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38741>
When discarding a fragment in Metal, it will not be demoted to helper. At
least for Apple Silicon M1 and M2. Call nir_lower_is_helper_invocation to
work around this.
Reviewed-by: Arcady Goldmints-Orlov <arcady@lunarg.com>
Signed-off-by: Aitor Camacho <aitor@lunarg.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38590>
Adds build instructions and workarounds documentation.
Workarounds documentation only has the biggest offenders and
there are probably way more in code that need yet to be
documented.
Reviewed-by: Arcady Goldmints-Orlov <arcady@lunarg.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38232>
