diff options
| -rw-r--r-- | src/glsl/Makefile.sources | 1 | ||||
| -rw-r--r-- | src/glsl/nir/nir.h | 2 | ||||
| -rw-r--r-- | src/glsl/nir/nir_remove_dead_variables.c | 138 |
3 files changed, 141 insertions, 0 deletions
diff --git a/src/glsl/Makefile.sources b/src/glsl/Makefile.sources index 83a99c189e1..7e8901b70bd 100644 --- a/src/glsl/Makefile.sources +++ b/src/glsl/Makefile.sources @@ -22,6 +22,7 @@ NIR_FILES = \ $(GLSL_SRCDIR)/nir/nir_opcodes.c \ $(GLSL_SRCDIR)/nir/nir_opcodes.h \ $(GLSL_SRCDIR)/nir/nir_print.c \ + $(GLSL_SRCDIR)/nir/nir_remove_dead_variables.c \ $(GLSL_SRCDIR)/nir/nir_validate.c \ $(GLSL_SRCDIR)/nir/nir_types.cpp \ $(GLSL_SRCDIR)/nir/glsl_to_nir.cpp diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h index 868c769d938..ca4c43c5e47 100644 --- a/src/glsl/nir/nir.h +++ b/src/glsl/nir/nir.h @@ -1252,6 +1252,8 @@ void nir_lower_variables_scalar(nir_shader *shader, bool lower_globals, bool lower_io, bool add_names, bool native_integers); +void nir_remove_dead_variables(nir_shader *shader); + #ifdef __cplusplus } /* extern "C" */ #endif diff --git a/src/glsl/nir/nir_remove_dead_variables.c b/src/glsl/nir/nir_remove_dead_variables.c new file mode 100644 index 00000000000..caf117a3939 --- /dev/null +++ b/src/glsl/nir/nir_remove_dead_variables.c @@ -0,0 +1,138 @@ +/* + * 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 ([email protected]) + * + */ + +#include "nir.h" + +static void +add_var_use_intrinsic(nir_intrinsic_instr *instr, struct set *live) +{ + unsigned num_vars = nir_intrinsic_infos[instr->intrinsic].num_variables; + for (unsigned i = 0; i < num_vars; i++) { + nir_variable *var = instr->variables[i]->var; + _mesa_set_add(live, _mesa_hash_pointer(var), var); + } +} + +static void +add_var_use_call(nir_call_instr *instr, struct set *live) +{ + if (instr->return_deref != NULL) { + nir_variable *var = instr->return_deref->var; + _mesa_set_add(live, _mesa_hash_pointer(var), var); + } + + for (unsigned i = 0; i < instr->num_params; i++) { + nir_variable *var = instr->params[i]->var; + _mesa_set_add(live, _mesa_hash_pointer(var), var); + } +} + +static void +add_var_use_tex(nir_tex_instr *instr, struct set *live) +{ + if (instr->sampler != NULL) { + nir_variable *var = instr->sampler->var; + _mesa_set_add(live, _mesa_hash_pointer(var), var); + } +} + +static bool +add_var_use_block(nir_block *block, void *state) +{ + struct set *live = (struct set *) state; + + nir_foreach_instr(block, instr) { + switch(instr->type) { + case nir_instr_type_intrinsic: + add_var_use_intrinsic(nir_instr_as_intrinsic(instr), live); + break; + + case nir_instr_type_call: + add_var_use_call(nir_instr_as_call(instr), live); + break; + + case nir_instr_type_texture: + add_var_use_tex(nir_instr_as_texture(instr), live); + break; + + default: + break; + } + } + + return true; +} + +static void +add_var_use_shader(nir_shader *shader, struct set *live) +{ + nir_foreach_overload(shader, overload) { + if (overload->impl) { + nir_foreach_block(overload->impl, add_var_use_block, live); + } + } +} + +static void +remove_dead_local_vars(nir_function_impl *impl, struct set *live) +{ + foreach_list_typed_safe(nir_variable, var, node, &impl->locals) { + struct set_entry *entry = + _mesa_set_search(live, _mesa_hash_pointer(var), var); + if (entry == NULL) + exec_node_remove(&var->node); + } +} + +static void +remove_dead_global_vars(nir_shader *shader, struct set *live) +{ + foreach_list_typed_safe(nir_variable, var, node, &shader->globals) { + struct set_entry *entry = + _mesa_set_search(live, _mesa_hash_pointer(var), var); + if (entry == NULL) + exec_node_remove(&var->node); + } +} + +void +nir_remove_dead_variables(nir_shader *shader) +{ + struct set *live = + _mesa_set_create(NULL, _mesa_key_pointer_equal); + + add_var_use_shader(shader, live); + + remove_dead_global_vars(shader, live); + + nir_foreach_overload(shader, overload) { + if (overload->impl) + remove_dead_local_vars(overload->impl, live); + } + + _mesa_set_destroy(live, NULL); +} |