This intrinsic was initially dedicated to mesh/task shaders, but the
mechanism it exposes also exists in the compute shaders on Gfx12.5+.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31508>
In SIMD32, the fence instruction is currently going to read grf0-3
leading to such assertions in the backend :
../src/intel/compiler/brw_fs_reg_allocate.cpp:206:
void fs_visitor::calculate_payload_ranges(bool, unsigned int, int*) const:
Assertion `j < payload_node_count' failed.
The reason we haven't seen the problem yet is that there always enough
payload register to accomodate this. But the following change is going
to make the inline parameter register optional.
Since SHADER_OPCODE_MEMORY_FENCE is emitted in the generator as SIMD1
NoMask (see brw_memory_fence), we can limit ourselves to SIMD1
exec_all() in the IR as well so that the IR accounts for grf0 as a
source.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31508>
