brw/sat: Eliminate non-defs saturate propagation
The intervening_saturating_copy test is removed. The defs version of the
pass does not handle this case. It should not occur often in practice
anyway. Copy propagation and brw_nir_opt_fsat should prevent this
scenario from happening.
No shader-db changes on any Intel platform.
fossil-db:
All Intel platforms had similar results. (Lunar Lake shown)
Totals:
Instrs: 212677275 -> 212677278 (+0.00%)
Cycle count: 30466062848 -> 30466056040 (-0.00%)
Totals from 1 (0.00% of 706300) affected shaders:
Instrs: 1343 -> 1346 (+0.22%)
Cycle count: 411664 -> 404856 (-1.65%)
v2: Stop counting ip. The non-defs part of the pass was the only thing
that used it.
v3: Also delete "if (block != def->block) continue;" code. I noticed
this while working on some other changes to this function. It's the last
thing in the loop, so it's totally useless. Delete some other spurious
continues too.
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com> [v2]
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31497>
2 files changed
