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/*
* Copyright © 2016 Intel Corporation
* Copyright © 2018 Valve Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "nir.h"
/**
* \file nir_opt_move_load_ubo.c
*
* This pass moves load UBO operations just before their first use inside
* the same basic block.
*/
static bool
move_load_ubo_source(nir_src *src, nir_block *block, nir_instr *before)
{
if (!src->is_ssa)
return false;
nir_instr *src_instr = src->ssa->parent_instr;
if (src_instr->block == block &&
src_instr->type == nir_instr_type_intrinsic &&
nir_instr_as_intrinsic(src_instr)->intrinsic == nir_intrinsic_load_ubo) {
exec_node_remove(&src_instr->node);
if (before)
exec_node_insert_node_before(&before->node, &src_instr->node);
else
exec_list_push_tail(&block->instr_list, &src_instr->node);
return true;
}
return false;
}
static bool
move_load_ubo_source_cb(nir_src *src, void *data)
{
bool *progress = data;
nir_instr *instr = src->parent_instr;
if (move_load_ubo_source(src, instr->block, instr))
*progress = true;
return true; /* nir_foreach_src should keep going */
}
static bool
move_load_ubo(nir_block *block)
{
bool progress = false;
nir_if *iff = nir_block_get_following_if(block);
if (iff) {
progress |= move_load_ubo_source(&iff->condition, block, NULL);
}
nir_foreach_instr_reverse(instr, block) {
if (instr->type == nir_instr_type_phi) {
/* We're going backwards so everything else is a phi too */
} else if (instr->type == nir_instr_type_alu) {
nir_alu_instr *alu = nir_instr_as_alu(instr);
for (int i = nir_op_infos[alu->op].num_inputs - 1; i >= 0; i--) {
progress |= move_load_ubo_source(&alu->src[i].src, block, instr);
}
} else {
nir_foreach_src(instr, move_load_ubo_source_cb, &progress);
}
}
return false;
}
bool
nir_opt_move_load_ubo(nir_shader *shader)
{
bool progress = false;
nir_foreach_function(func, shader) {
if (!func->impl)
continue;
nir_foreach_block(block, func->impl) {
if (move_load_ubo(block)) {
nir_metadata_preserve(func->impl, nir_metadata_block_index |
nir_metadata_dominance |
nir_metadata_live_ssa_defs);
progress = true;
}
}
}
return progress;
}
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