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etnaviv: nir: Enable vectorization with 4-component width limit

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Add a custom ALU width callback that returns 4 to enable vectorization
of scalar operations up to 4 components. Without this callback, the
nir_lower_alu_width pass generates excessive scalar code instead of
utilizing etnaviv's vector capabilities.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/13531

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36130>
This commit is contained in:
Christian Gmeiner 2025-07-15 10:20:59 +02:00 • committed by Marge Bot
parent 850a3b0cae
commit 76f2735fe2
1 changed files with 7 additions and 1 deletions
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8
src/gallium/drivers/etnaviv/etnaviv_compiler_nir.c
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@ -1181,6 +1181,12 @@ fill_vs_mystery(struct etna_shader_variant *v)
VIVS_VS_LOAD_BALANCING_D(0x0f);
}
static uint8_t
alu_width_cb(UNUSED const nir_instr *instr, UNUSED const void *cb_data)
{
return 4;
}
bool
etna_compile_shader(struct etna_shader_variant *v)
{
@ -1260,7 +1266,7 @@ etna_compile_shader(struct etna_shader_variant *v)
NIR_PASS(_, s, nir_lower_vars_to_ssa);
NIR_PASS(_, s, nir_lower_indirect_derefs, nir_var_all, UINT32_MAX);
NIR_PASS(_, s, etna_nir_lower_texture, &v->key, v->shader->info);
NIR_PASS(_, s, nir_lower_alu_width, NULL, NULL);
NIR_PASS(_, s, nir_lower_alu_width, alu_width_cb, NULL);
NIR_PASS(_, s, nir_lower_alu_to_scalar, etna_alu_to_scalar_filter_cb, c->info);
if (c->info->halti >= 2) {