mirror of https://gitlab.freedesktop.org/mesa/mesa
151 lines
5.2 KiB
C
151 lines
5.2 KiB
C
/*
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* Copyright © 2014 Intel Corporation
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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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* Authors:
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* Connor Abbott (cwabbott0@gmail.com)
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*
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*/
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#include "nir.h"
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#include "main/config.h"
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#include <assert.h>
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/*
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* replace atomic counter intrinsics that use a variable with intrinsics
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* that directly store the buffer index and byte offset
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*/
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static void
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lower_instr(nir_intrinsic_instr *instr, nir_function_impl *impl)
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{
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nir_intrinsic_op op;
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switch (instr->intrinsic) {
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case nir_intrinsic_atomic_counter_read_var:
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op = nir_intrinsic_atomic_counter_read;
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break;
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case nir_intrinsic_atomic_counter_inc_var:
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op = nir_intrinsic_atomic_counter_inc;
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break;
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case nir_intrinsic_atomic_counter_dec_var:
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op = nir_intrinsic_atomic_counter_dec;
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break;
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default:
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return;
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}
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if (instr->variables[0]->var->data.mode != nir_var_uniform &&
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instr->variables[0]->var->data.mode != nir_var_shader_storage)
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return; /* atomics passed as function arguments can't be lowered */
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void *mem_ctx = ralloc_parent(instr);
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nir_intrinsic_instr *new_instr = nir_intrinsic_instr_create(mem_ctx, op);
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new_instr->const_index[0] =
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(int) instr->variables[0]->var->data.atomic.buffer_index;
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nir_load_const_instr *offset_const = nir_load_const_instr_create(mem_ctx, 1);
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offset_const->value.u[0] = instr->variables[0]->var->data.atomic.offset;
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nir_instr_insert_before(&instr->instr, &offset_const->instr);
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nir_ssa_def *offset_def = &offset_const->def;
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if (instr->variables[0]->deref.child != NULL) {
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assert(instr->variables[0]->deref.child->deref_type ==
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nir_deref_type_array);
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nir_deref_array *deref_array =
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nir_deref_as_array(instr->variables[0]->deref.child);
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assert(deref_array->deref.child == NULL);
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offset_const->value.u[0] +=
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deref_array->base_offset * ATOMIC_COUNTER_SIZE;
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if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
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nir_load_const_instr *atomic_counter_size =
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nir_load_const_instr_create(mem_ctx, 1);
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atomic_counter_size->value.u[0] = ATOMIC_COUNTER_SIZE;
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nir_instr_insert_before(&instr->instr, &atomic_counter_size->instr);
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nir_alu_instr *mul = nir_alu_instr_create(mem_ctx, nir_op_imul);
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nir_ssa_dest_init(&mul->instr, &mul->dest.dest, 1, NULL);
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mul->dest.write_mask = 0x1;
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nir_src_copy(&mul->src[0].src, &deref_array->indirect, mem_ctx);
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mul->src[1].src.is_ssa = true;
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mul->src[1].src.ssa = &atomic_counter_size->def;
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nir_instr_insert_before(&instr->instr, &mul->instr);
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nir_alu_instr *add = nir_alu_instr_create(mem_ctx, nir_op_iadd);
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nir_ssa_dest_init(&add->instr, &add->dest.dest, 1, NULL);
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add->dest.write_mask = 0x1;
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add->src[0].src.is_ssa = true;
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add->src[0].src.ssa = &mul->dest.dest.ssa;
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add->src[1].src.is_ssa = true;
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add->src[1].src.ssa = &offset_const->def;
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nir_instr_insert_before(&instr->instr, &add->instr);
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offset_def = &add->dest.dest.ssa;
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}
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}
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new_instr->src[0].is_ssa = true;
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new_instr->src[0].ssa = offset_def;
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if (instr->dest.is_ssa) {
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nir_ssa_dest_init(&new_instr->instr, &new_instr->dest,
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instr->dest.ssa.num_components, NULL);
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nir_ssa_def_rewrite_uses(&instr->dest.ssa,
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nir_src_for_ssa(&new_instr->dest.ssa),
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mem_ctx);
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} else {
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nir_dest_copy(&new_instr->dest, &instr->dest, mem_ctx);
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}
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nir_instr_insert_before(&instr->instr, &new_instr->instr);
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nir_instr_remove(&instr->instr);
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}
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static bool
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lower_block(nir_block *block, void *state)
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{
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nir_foreach_instr_safe(block, instr) {
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if (instr->type == nir_instr_type_intrinsic)
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lower_instr(nir_instr_as_intrinsic(instr), state);
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}
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return true;
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}
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void
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nir_lower_atomics(nir_shader *shader)
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{
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nir_foreach_overload(shader, overload) {
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if (overload->impl) {
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nir_foreach_block(overload->impl, lower_block, overload->impl);
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nir_metadata_preserve(overload->impl, nir_metadata_block_index |
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nir_metadata_dominance);
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}
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}
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}
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