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agx/nir_lower_gs: avoid redundant sr read's

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saves 2 SR reads in a SW VS

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34661>
This commit is contained in:
Alyssa Rosenzweig 2025-04-22 09:46:35 -04:00 • committed by Marge Bot
parent 8b0dca384f
commit 3670f95e12
1 changed files with 12 additions and 3 deletions
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15
src/asahi/lib/agx_nir_lower_gs.c
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@ -1586,7 +1586,7 @@ lower_vs_before_gs(nir_builder *b, nir_intrinsic_instr *intr, void *data)
nir_io_semantics sem = nir_intrinsic_io_semantics(intr);
nir_def *location = nir_iadd_imm(b, intr->src[1].ssa, sem.location);
nir_def *buffer, *nr_verts;
nir_def *buffer, *nr_verts, *instance_id, *primitive_id;
if (b->shader->info.stage == MESA_SHADER_VERTEX) {
buffer = nir_load_vs_output_buffer_agx(b);
nr_verts =
@ -1599,8 +1599,17 @@ lower_vs_before_gs(nir_builder *b, nir_intrinsic_instr *intr, void *data)
buffer = libagx_tes_buffer(b, nir_load_tess_param_buffer_agx(b));
}
nir_def *linear_id = nir_iadd(b, nir_imul(b, load_instance_id(b), nr_verts),
load_primitive_id(b));
if (b->shader->info.stage == MESA_SHADER_VERTEX &&
!b->shader->info.vs.tes_agx) {
primitive_id = nir_load_vertex_id_zero_base(b);
instance_id = nir_load_instance_id(b);
} else {
primitive_id = load_primitive_id(b);
instance_id = load_instance_id(b);
}
nir_def *linear_id =
nir_iadd(b, nir_imul(b, instance_id, nr_verts), primitive_id);
nir_def *addr = libagx_vertex_output_address(
b, buffer, nir_imm_int64(b, b->shader->info.outputs_written), linear_id,