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nir/lower_gs_intrinsics: Remove end primitive for points

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EndPrimitive() for points is entirely pointless, so just remove it when lowering
EndPrimitive to simplify the IR. This is (maybe) an optimization everywhere, and
will be relied on for correctness on Asahi.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24798>
This commit is contained in:
Alyssa Rosenzweig 2023-07-16 09:06:06 -04:00 • committed by Marge Bot
parent 8c7629524e
commit f9e5534182
1 changed files with 9 additions and 7 deletions
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16
src/compiler/nir/nir_lower_gs_intrinsics.c
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@ -201,15 +201,21 @@ rewrite_end_primitive(nir_intrinsic_instr *intrin, struct state *state)
nir_builder *b = state->builder;
unsigned stream = nir_intrinsic_stream_id(intrin);
b->cursor = nir_before_instr(&intrin->instr);
b->cursor = nir_instr_remove(&intrin->instr);
state->progress = true;
/* end_primitive doesn't do anything for points, remove without replacing */
if (state->is_points) {
b->shader->info.gs.uses_end_primitive = false;
return;
}
assert(state->vertex_count_vars[stream] != NULL);
nir_def *count = nir_load_var(b, state->vertex_count_vars[stream]);
nir_def *count_per_primitive;
if (state->count_vtx_per_prim)
count_per_primitive = nir_load_var(b, state->vtxcnt_per_prim_vars[stream]);
else if (state->is_points)
count_per_primitive = nir_imm_int(b, 0);
else
count_per_primitive = nir_undef(b, count->num_components, count->bit_size);
@ -232,10 +238,6 @@ rewrite_end_primitive(nir_intrinsic_instr *intrin, struct state *state)
nir_imm_int(b, 0),
0x1); /* .x */
}
nir_instr_remove(&intrin->instr);
state->progress = true;
}
static bool