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brw: Skip fetching unread leading components of UBO loads

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We were already skipping unread trailing components, but now we skip
them on both ends.

About -3.5% spills on Shadow of the Tomb Raider on Alchemist (mostly a
wash elsewhere, but it will help additional shaders with later patches).

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32888>
This commit is contained in:
Kenneth Graunke
2024-12-27 02:47:51 -08:00
committed by Marge Bot
parent c8b2ab041e
commit 03f948f5fd
1 changed files with 20 additions and 11 deletions
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31
src/intel/compiler/brw_fs_nir.cpp
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@@ -6193,8 +6193,11 @@ fs_nir_emit_intrinsic(nir_to_brw_state &ntb,
else
surface = get_nir_buffer_intrinsic_index(ntb, bld, instr, &no_mask_handle);
const unsigned num_components =
nir_def_last_component_read(&instr->def) + 1;
const unsigned first_component =
nir_def_first_component_read(&instr->def);
const unsigned last_component =
nir_def_last_component_read(&instr->def);
const unsigned num_components = last_component - first_component + 1;
if (!nir_src_is_const(instr->src[1])) {
s.prog_data->has_ubo_pull = true;
@@ -6209,8 +6212,10 @@ fs_nir_emit_intrinsic(nir_to_brw_state &ntb,
const unsigned comps_per_load = brw_type_size_bytes(dest.type) == 8 ? 2 : 4;
for (unsigned i = 0; i < num_components; i += comps_per_load) {
const unsigned remaining = num_components - i;
for (unsigned i = first_component;
i <= last_component;
i += comps_per_load) {
const unsigned remaining = last_component + 1 - i;
xbld.VARYING_PULL_CONSTANT_LOAD(offset(dest, xbld, i),
surface, surface_handle,
base_offset,
@@ -6232,12 +6237,13 @@ fs_nir_emit_intrinsic(nir_to_brw_state &ntb,
* and we have to split it if necessary.
*/
const unsigned type_size = brw_type_size_bytes(dest.type);
const unsigned load_offset = nir_src_as_uint(instr->src[1]);
const unsigned load_offset =
nir_src_as_uint(instr->src[1]) + first_component * type_size;
const unsigned end_offset = load_offset + num_components * type_size;
const unsigned ubo_block =
brw_nir_ubo_surface_index_get_push_block(instr->src[0]);
const unsigned offset_256b = load_offset / 32;
const unsigned end_256b =
DIV_ROUND_UP(load_offset + type_size * num_components, 32);
const unsigned end_256b = DIV_ROUND_UP(end_offset, 32);
/* See if we've selected this as a push constant candidate */
brw_reg push_reg;
@@ -6254,9 +6260,10 @@ fs_nir_emit_intrinsic(nir_to_brw_state &ntb,
}
if (push_reg.file != BAD_FILE) {
for (unsigned i = 0; i < num_components; i++) {
for (unsigned i = first_component; i <= last_component; i++) {
xbld.MOV(offset(dest, xbld, i),
byte_offset(push_reg, i * type_size));
byte_offset(push_reg,
(i - first_component) * type_size));
}
break;
}
@@ -6286,8 +6293,10 @@ fs_nir_emit_intrinsic(nir_to_brw_state &ntb,
retype(byte_offset(packed_consts, base & (block_sz - 1)),
dest.type);
for (unsigned d = 0; d < count; d++)
xbld.MOV(offset(dest, xbld, c + d), component(consts, d));
for (unsigned d = 0; d < count; d++) {
xbld.MOV(offset(dest, xbld, first_component + c + d),
component(consts, d));
}
c += count;
}