130 lines
4.2 KiB
C
130 lines
4.2 KiB
C
/*
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* Copyright © 2020 Google LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/**
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* @file
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*
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* Removes unused trailing components from store data.
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*
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*/
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#include "nir.h"
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#include "nir_builder.h"
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static bool
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opt_shrink_vectors_image_store(nir_builder *b, nir_intrinsic_instr *instr)
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{
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enum pipe_format format;
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if (instr->intrinsic == nir_intrinsic_image_deref_store) {
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nir_deref_instr *deref = nir_src_as_deref(instr->src[0]);
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format = nir_deref_instr_get_variable(deref)->data.image.format;
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} else {
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format = nir_intrinsic_format(instr);
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}
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if (format == PIPE_FORMAT_NONE)
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return false;
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unsigned components = util_format_get_nr_components(format);
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if (components >= instr->num_components)
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return false;
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nir_ssa_def *data = nir_trim_vector(b, instr->src[3].ssa, components);
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nir_instr_rewrite_src(&instr->instr, &instr->src[3], nir_src_for_ssa(data));
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instr->num_components = components;
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return true;
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}
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static bool
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opt_shrink_store_instr(nir_builder *b, nir_intrinsic_instr *instr, bool shrink_image_store)
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{
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b->cursor = nir_before_instr(&instr->instr);
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switch (instr->intrinsic) {
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case nir_intrinsic_store_output:
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case nir_intrinsic_store_per_vertex_output:
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case nir_intrinsic_store_ssbo:
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case nir_intrinsic_store_shared:
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case nir_intrinsic_store_global:
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case nir_intrinsic_store_scratch:
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break;
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case nir_intrinsic_bindless_image_store:
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case nir_intrinsic_image_deref_store:
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case nir_intrinsic_image_store:
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return shrink_image_store && opt_shrink_vectors_image_store(b, instr);
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default:
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return false;
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}
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/* Must be a vectorized intrinsic that we can resize. */
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assert(instr->num_components != 0);
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/* Trim the num_components stored according to the write mask. */
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unsigned write_mask = nir_intrinsic_write_mask(instr);
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unsigned last_bit = util_last_bit(write_mask);
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if (last_bit < instr->num_components && instr->src[0].is_ssa) {
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nir_ssa_def *def = nir_trim_vector(b, instr->src[0].ssa, last_bit);
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nir_instr_rewrite_src(&instr->instr,
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&instr->src[0],
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nir_src_for_ssa(def));
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instr->num_components = last_bit;
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return true;
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}
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return false;
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}
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bool
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nir_opt_shrink_stores(nir_shader *shader, bool shrink_image_store)
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{
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bool progress = false;
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nir_foreach_function(function, shader) {
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if (!function->impl)
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continue;
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nir_builder b;
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nir_builder_init(&b, function->impl);
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nir_foreach_block(block, function->impl) {
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nir_foreach_instr(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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progress |= opt_shrink_store_instr(&b, intrin, shrink_image_store);
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}
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}
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if (progress) {
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nir_metadata_preserve(function->impl,
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nir_metadata_block_index |
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nir_metadata_dominance);
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} else {
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nir_metadata_preserve(function->impl, nir_metadata_all);
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}
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}
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return progress;
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}
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