diff options
Diffstat (limited to 'mesalib/src/glsl/nir/nir_lower_atomics.c')
| -rw-r--r-- | mesalib/src/glsl/nir/nir_lower_atomics.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/mesalib/src/glsl/nir/nir_lower_atomics.c b/mesalib/src/glsl/nir/nir_lower_atomics.c new file mode 100644 index 000000000..e82df0169 --- /dev/null +++ b/mesalib/src/glsl/nir/nir_lower_atomics.c @@ -0,0 +1,148 @@ +/* + * 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 "nir.h" +#include "main/config.h" +#include <assert.h> + +/* + * replace atomic counter intrinsics that use a variable with intrinsics + * that directly store the buffer index and byte offset + */ + +static void +lower_instr(nir_intrinsic_instr *instr, nir_function_impl *impl) +{ + 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; + + default: + return; + } + + if (instr->variables[0]->var->data.mode != nir_var_uniform) + return; /* atomics passed as function arguments can't be lowered */ + + void *mem_ctx = ralloc_parent(instr); + + nir_intrinsic_instr *new_instr = nir_intrinsic_instr_create(mem_ctx, op); + new_instr->const_index[0] = + (int) instr->variables[0]->var->data.atomic.buffer_index; + + nir_load_const_instr *offset_const = nir_load_const_instr_create(mem_ctx, 1); + offset_const->value.u[0] = instr->variables[0]->var->data.atomic.offset; + + nir_instr_insert_before(&instr->instr, &offset_const->instr); + + nir_ssa_def *offset_def = &offset_const->def; + + if (instr->variables[0]->deref.child != NULL) { + assert(instr->variables[0]->deref.child->deref_type == + nir_deref_type_array); + nir_deref_array *deref_array = + nir_deref_as_array(instr->variables[0]->deref.child); + assert(deref_array->deref.child == NULL); + + offset_const->value.u[0] += deref_array->base_offset; + + 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); + atomic_counter_size->value.u[0] = 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, NULL); + mul->dest.write_mask = 0x1; + nir_src_copy(&mul->src[0].src, &deref_array->indirect, mem_ctx); + 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, 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_const->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;; + + if (instr->dest.is_ssa) { + nir_ssa_dest_init(&new_instr->instr, &new_instr->dest, + instr->dest.ssa.num_components, NULL); + nir_ssa_def_rewrite_uses(&instr->dest.ssa, + nir_src_for_ssa(&new_instr->dest.ssa), + mem_ctx); + } 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); +} + +static bool +lower_block(nir_block *block, void *state) +{ + nir_foreach_instr_safe(block, instr) { + if (instr->type == nir_instr_type_intrinsic) + lower_instr(nir_instr_as_intrinsic(instr), state); + } + + return true; +} + +void +nir_lower_atomics(nir_shader *shader) +{ + nir_foreach_overload(shader, overload) { + if (overload->impl) { + nir_foreach_block(overload->impl, lower_block, overload->impl); + nir_metadata_preserve(overload->impl, nir_metadata_block_index | + nir_metadata_dominance); + } + } +} |