After dae57e184a ("glsl,st/mesa: always lower IO for GLSL, unlower
IO for drivers"), the shaders updated by sfn_nir_legalize_image_load_store
on cayman could trigger a segmentation fault. The main issue is that
sfn_nir_legalize_image_load_store does not handle properly the ssa
dominance functionality and this issue is exacerbated by this last
mesa update.
This change makes the ssa dominance functionality operational.
This commit implements pass_flags to avoid an infinite loop.
For instance, this issue is triggered on cayman using this
environment variable NIR_DEBUG=validate_ssa_dominance with:
"piglit/bin/oes_egl_image_external_essl3 -auto -fbo":
NIR validation failed after r600_legalize_image_load_store in ../src/gallium/drivers/r600/sfn/sfn_nir.cpp
Signed-off-by: Patrick Lerda <patrick9876@free.fr>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32894>
c707bb5e8f