The initial helpers as support for removing unused varyings between stages. --- src/compiler/Makefile.sources | 1 + src/compiler/nir/nir.h | 6 ++ src/compiler/nir/nir_linking_helpers.c | 136 +++++++++++++++++++++++++++++++++ 3 files changed, 143 insertions(+) create mode 100644 src/compiler/nir/nir_linking_helpers.c
diff --git a/src/compiler/Makefile.sources b/src/compiler/Makefile.sources index 0153df2d812..9c7f057eecf 100644 --- a/src/compiler/Makefile.sources +++ b/src/compiler/Makefile.sources @@ -203,6 +203,7 @@ NIR_FILES = \ nir/nir_instr_set.h \ nir/nir_intrinsics.c \ nir/nir_intrinsics.h \ + nir/nir_linking_helpers.c \ nir/nir_liveness.c \ nir/nir_loop_analyze.c \ nir/nir_loop_analyze.h \ diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h index e52a1006896..1e89c74d14c 100644 --- a/src/compiler/nir/nir.h +++ b/src/compiler/nir/nir.h @@ -2448,6 +2448,12 @@ void nir_shader_gather_info(nir_shader *shader, nir_function_impl *entrypoint); void nir_assign_var_locations(struct exec_list *var_list, unsigned *size, int (*type_size)(const struct glsl_type *)); +/* Some helpers to do very simple linking */ +bool nir_remove_unwritten_outputs(nir_shader *shader); +bool nir_remove_unread_outputs(nir_shader *shader, uint64_t outputs_read); +bool nir_remove_unused_varyings(nir_shader *producer, nir_shader *consumer); +bool nir_compact_varyings(nir_shader *producer, nir_shader *consumer); + typedef enum { /* If set, this forces all non-flat fragment shader inputs to be * interpolated as if with the "sample" qualifier. This requires diff --git a/src/compiler/nir/nir_linking_helpers.c b/src/compiler/nir/nir_linking_helpers.c new file mode 100644 index 00000000000..d567aa713ad --- /dev/null +++ b/src/compiler/nir/nir_linking_helpers.c @@ -0,0 +1,136 @@ +/* + * Copyright © 2015 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. + */ + +#include "nir.h" +#include "util/set.h" +#include "util/hash_table.h" + +/* This file contains various little helpers for doing simple linking in + * NIR. Eventually, we'll probably want a full-blown varying packing + * implementation in here. Right now, it just deletes unused things. + */ + +static void +find_live_tcs_outputs(nir_shader *shader, struct set *live) +{ + nir_foreach_function(function, shader) { + if (function->impl) { + nir_foreach_block(block, function->impl) { + nir_foreach_instr(instr, block) { + if (instr->type == nir_instr_type_intrinsic) { + nir_intrinsic_instr *intrin_instr = + nir_instr_as_intrinsic(instr); + if (intrin_instr->intrinsic == nir_intrinsic_load_var && + intrin_instr->variables[0]->var->data.mode == + nir_var_shader_out) { + _mesa_set_add(live, intrin_instr->variables[0]->var); + } + } + } + } + } + } +} + +static bool +remove_unused_io_vars(nir_shader *shader, struct exec_list *var_list, + uint64_t used_by_other_stage, + struct set *live_tcs_outputs) +{ + bool progress = false; + + nir_foreach_variable_safe(var, var_list) { + /* TODO: add patch support */ + if (var->data.patch) + continue; + + if (var->data.location < VARYING_SLOT_VAR0 && var->data.location >= 0) + continue; + + if (var->data.always_active_io) + continue; + + if (!(used_by_other_stage & + nir_variable_get_io_mask(var, shader->stage))) { + /* Each TCS invocation can read data written by other TCS invocations, + * so even if the outputs are not used by the TES we must also make + * sure they are not read by the TCS before demoting them to globals. + */ + if (live_tcs_outputs) { + assert(shader->stage == MESA_SHADER_TESS_CTRL && + var->data.mode == nir_var_shader_out); + + struct set_entry *entry = _mesa_set_search(live_tcs_outputs, var); + if (entry) { + continue; + } + } + + /* This one is invalid, make it a global variable instead */ + var->data.location = 0; + var->data.mode = nir_var_global; + + exec_node_remove(&var->node); + exec_list_push_tail(&shader->globals, &var->node); + + progress = true; + } + } + + return progress; +} + +bool +nir_remove_unused_varyings(nir_shader *producer, nir_shader *consumer) +{ + assert(producer->stage != MESA_SHADER_FRAGMENT); + assert(consumer->stage != MESA_SHADER_VERTEX); + + uint64_t read = 0, written = 0; + + nir_foreach_variable(var, &producer->outputs) + written |= nir_variable_get_io_mask(var, producer->stage); + + nir_foreach_variable(var, &consumer->inputs) + read |= nir_variable_get_io_mask(var, consumer->stage); + + struct set *live_tcs_outputs; + if (producer->stage == MESA_SHADER_TESS_CTRL) { + live_tcs_outputs = + _mesa_set_create(NULL, _mesa_hash_pointer, _mesa_key_pointer_equal); + find_live_tcs_outputs(producer, live_tcs_outputs); + } else { + live_tcs_outputs = NULL; + } + + bool progress = false; + progress = remove_unused_io_vars(producer, &producer->outputs, read, + live_tcs_outputs); + + progress = remove_unused_io_vars(consumer, &consumer->inputs, written, + NULL) || progress; + + _mesa_set_destroy(live_tcs_outputs, NULL); + + return progress; +} -- 2.13.5 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev