/* * Copyright © 2014 Intel 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. * * Authors: * Connor Abbott (cwabbott0@gmail.com) * */ #include "compiler/glsl/ir_uniform.h" #include "nir.h" #include "main/config.h" #include /* * replace atomic counter intrinsics that use a variable with intrinsics * that directly store the buffer index and byte offset */ static bool lower_instr(nir_intrinsic_instr *instr, const struct gl_shader_program *shader_program, nir_shader *shader) { nir_intrinsic_op op; switch (instr->intrinsic) { case nir_intrinsic_atomic_counter_read_var: op = nir_intrinsic_atomic_counter_read; break; case nir_intrinsic_atomic_counter_inc_var: op = nir_intrinsic_atomic_counter_inc; break; case nir_intrinsic_atomic_counter_dec_var: op = nir_intrinsic_atomic_counter_dec; break; case nir_intrinsic_atomic_counter_add_var: op = nir_intrinsic_atomic_counter_add; break; case nir_intrinsic_atomic_counter_min_var: op = nir_intrinsic_atomic_counter_min; break; case nir_intrinsic_atomic_counter_max_var: op = nir_intrinsic_atomic_counter_max; break; case nir_intrinsic_atomic_counter_and_var: op = nir_intrinsic_atomic_counter_and; break; case nir_intrinsic_atomic_counter_or_var: op = nir_intrinsic_atomic_counter_or; break; case nir_intrinsic_atomic_counter_xor_var: op = nir_intrinsic_atomic_counter_xor; break; case nir_intrinsic_atomic_counter_exchange_var: op = nir_intrinsic_atomic_counter_exchange; break; case nir_intrinsic_atomic_counter_comp_swap_var: op = nir_intrinsic_atomic_counter_comp_swap; break; default: return false; } if (instr->variables[0]->var->data.mode != nir_var_uniform && instr->variables[0]->var->data.mode != nir_var_shader_storage && instr->variables[0]->var->data.mode != nir_var_shared) return false; /* atomics passed as function arguments can't be lowered */ void *mem_ctx = ralloc_parent(instr); unsigned uniform_loc = instr->variables[0]->var->data.location; nir_intrinsic_instr *new_instr = nir_intrinsic_instr_create(mem_ctx, op); nir_intrinsic_set_base(new_instr, shader_program->data->UniformStorage[uniform_loc].opaque[shader->stage].index); nir_load_const_instr *offset_const = nir_load_const_instr_create(mem_ctx, 1, 32); offset_const->value.u32[0] = instr->variables[0]->var->data.offset; nir_instr_insert_before(&instr->instr, &offset_const->instr); nir_ssa_def *offset_def = &offset_const->def; nir_deref *tail = &instr->variables[0]->deref; while (tail->child != NULL) { nir_deref_array *deref_array = nir_deref_as_array(tail->child); tail = tail->child; unsigned child_array_elements = tail->child != NULL ? glsl_get_aoa_size(tail->type) : 1; offset_const->value.u32[0] += deref_array->base_offset * child_array_elements * ATOMIC_COUNTER_SIZE; if (deref_array->deref_array_type == nir_deref_array_type_indirect) { nir_load_const_instr *atomic_counter_size = nir_load_const_instr_create(mem_ctx, 1, 32); atomic_counter_size->value.u32[0] = child_array_elements * ATOMIC_COUNTER_SIZE; nir_instr_insert_before(&instr->instr, &atomic_counter_size->instr); nir_alu_instr *mul = nir_alu_instr_create(mem_ctx, nir_op_imul); nir_ssa_dest_init(&mul->instr, &mul->dest.dest, 1, 32, NULL); mul->dest.write_mask = 0x1; nir_src_copy(&mul->src[0].src, &deref_array->indirect, mul); mul->src[1].src.is_ssa = true; mul->src[1].src.ssa = &atomic_counter_size->def; nir_instr_insert_before(&instr->instr, &mul->instr); nir_alu_instr *add = nir_alu_instr_create(mem_ctx, nir_op_iadd); nir_ssa_dest_init(&add->instr, &add->dest.dest, 1, 32, NULL); add->dest.write_mask = 0x1; add->src[0].src.is_ssa = true; add->src[0].src.ssa = &mul->dest.dest.ssa; add->src[1].src.is_ssa = true; add->src[1].src.ssa = offset_def; nir_instr_insert_before(&instr->instr, &add->instr); offset_def = &add->dest.dest.ssa; } } new_instr->src[0].is_ssa = true; new_instr->src[0].ssa = offset_def; /* Copy the other sources, if any, from the original instruction to the new * instruction. */ for (unsigned i = 0; i < nir_intrinsic_infos[instr->intrinsic].num_srcs; i++) new_instr->src[i + 1] = instr->src[i]; if (instr->dest.is_ssa) { nir_ssa_dest_init(&new_instr->instr, &new_instr->dest, instr->dest.ssa.num_components, 32, NULL); nir_ssa_def_rewrite_uses(&instr->dest.ssa, nir_src_for_ssa(&new_instr->dest.ssa)); } else { nir_dest_copy(&new_instr->dest, &instr->dest, mem_ctx); } nir_instr_insert_before(&instr->instr, &new_instr->instr); nir_instr_remove(&instr->instr); return true; } bool nir_lower_atomics(nir_shader *shader, const struct gl_shader_program *shader_program) { bool progress = false; nir_foreach_function(function, shader) { if (function->impl) { nir_foreach_block(block, function->impl) { nir_foreach_instr_safe(instr, block) { if (instr->type == nir_instr_type_intrinsic) progress |= lower_instr(nir_instr_as_intrinsic(instr), shader_program, shader); } } nir_metadata_preserve(function->impl, nir_metadata_block_index | nir_metadata_dominance); } } return progress; }