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nir,agx: fix load_active_subgroup_index

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It can't be reordered globally, since its value is control-flow dependent.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29179>
This commit is contained in:
Alyssa Rosenzweig 2024-04-20 12:38:29 -04:00 • committed by Marge Bot
parent 7fb60c4c81
commit eb5f82d221
2 changed files with 2 additions and 2 deletions
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2
src/asahi/compiler/agx_nir_lower_subgroups.c
View file

@ -29,7 +29,7 @@ lower(nir_builder *b, nir_intrinsic_instr *intr, void *data)
}
case nir_intrinsic_first_invocation: {
nir_def *active_id = nir_load_active_subgroup_invocation_agx(b);
nir_def *active_id = nir_load_active_subgroup_invocation_agx(b, 16);
nir_def *is_first = nir_ieq_imm(b, active_id, 0);
nir_def *first_bit = nir_ballot(b, 1, 32, is_first);
nir_def_rewrite_uses(&intr->def, nir_ufind_msb(b, first_bit));

2
src/compiler/nir/nir_intrinsics.py
View file

@ -1801,7 +1801,7 @@ intrinsic("load_fep_w_v3d", dest_comp=1, flags=[CAN_ELIMINATE, CAN_REORDER])
# Active invocation index within the subgroup.
# Equivalent to popcount(ballot(true) & ((1 << subgroup_invocation) - 1))
system_value("active_subgroup_invocation_agx", 1)
intrinsic("load_active_subgroup_invocation_agx", dest_comp=1, flags=[CAN_ELIMINATE])
# Like ballot() but only within a quad.
intrinsic("quad_ballot_agx", src_comp=[1], dest_comp=1, flags=[CAN_ELIMINATE])