diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/glsl/Makefile.sources | 1 | ||||
| -rw-r--r-- | src/glsl/nir/nir.h | 3 | ||||
| -rw-r--r-- | src/glsl/nir/nir_lower_var_copies.c | 223 |
3 files changed, 227 insertions, 0 deletions
diff --git a/src/glsl/Makefile.sources b/src/glsl/Makefile.sources index 4c9aa77ceb6..006e9472188 100644 --- a/src/glsl/Makefile.sources +++ b/src/glsl/Makefile.sources @@ -32,6 +32,7 @@ NIR_FILES = \ $(GLSL_SRCDIR)/nir/nir_lower_system_values.c \ $(GLSL_SRCDIR)/nir/nir_lower_to_source_mods.c \ $(GLSL_SRCDIR)/nir/nir_lower_vars_to_ssa.c \ + $(GLSL_SRCDIR)/nir/nir_lower_var_copies.c \ $(GLSL_SRCDIR)/nir/nir_lower_vec_to_movs.c \ $(GLSL_SRCDIR)/nir/nir_metadata.c \ $(GLSL_SRCDIR)/nir/nir_opcodes.c \ diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h index 12cac728cff..1faeb02156c 100644 --- a/src/glsl/nir/nir.h +++ b/src/glsl/nir/nir.h @@ -1461,6 +1461,9 @@ void nir_dump_cfg(nir_shader *shader, FILE *fp); void nir_split_var_copies(nir_shader *shader); +void nir_lower_var_copy_instr(nir_intrinsic_instr *copy, void *mem_ctx); +void nir_lower_var_copies(nir_shader *shader); + void nir_lower_global_vars_to_local(nir_shader *shader); void nir_lower_locals_to_regs(nir_shader *shader); diff --git a/src/glsl/nir/nir_lower_var_copies.c b/src/glsl/nir/nir_lower_var_copies.c new file mode 100644 index 00000000000..a9d1a47ea69 --- /dev/null +++ b/src/glsl/nir/nir_lower_var_copies.c @@ -0,0 +1,223 @@ +/* + * 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: + * Jason Ekstrand ([email protected]) + * + */ + +#include "nir.h" +#include "nir_types.h" + +/* + * Lowers all copy intrinsics to sequences of load/store intrinsics. + */ + +/* Walks down the deref chain and returns the next deref in the chain whose + * child is a wildcard. In other words, given the chain a[1].foo[*].bar, + * this function will return the deref to foo. Calling it a second time + * with the [*].bar, it will return NULL. + */ +static nir_deref * +deref_next_wildcard_parent(nir_deref *deref) +{ + for (nir_deref *tail = deref; tail->child; tail = tail->child) { + if (tail->child->deref_type != nir_deref_type_array) + continue; + + nir_deref_array *arr = nir_deref_as_array(tail->child); + + if (arr->deref_array_type == nir_deref_array_type_wildcard) + return tail; + } + + return NULL; +} + +/* Returns the last deref in the chain. + */ +static nir_deref * +get_deref_tail(nir_deref *deref) +{ + while (deref->child) + deref = deref->child; + + return deref; +} + +static int +type_get_length(const struct glsl_type *type) +{ + switch (glsl_get_base_type(type)) { + case GLSL_TYPE_STRUCT: + case GLSL_TYPE_ARRAY: + return glsl_get_length(type); + case GLSL_TYPE_FLOAT: + case GLSL_TYPE_INT: + case GLSL_TYPE_UINT: + case GLSL_TYPE_BOOL: + if (glsl_type_is_matrix(type)) + return glsl_get_matrix_columns(type); + else + return glsl_get_vector_elements(type); + default: + unreachable("Invalid deref base type"); + } +} + +/* This function recursively walks the given deref chain and replaces the + * given copy instruction with an equivalent sequence load/store + * operations. + * + * @copy_instr The copy instruction to replace; new instructions will be + * inserted before this one + * + * @dest_head The head of the destination variable deref chain + * + * @src_head The head of the source variable deref chain + * + * @dest_tail The current tail of the destination variable deref chain; + * this is used for recursion and external callers of this + * function should call it with tail == head + * + * @src_tail The current tail of the source variable deref chain; + * this is used for recursion and external callers of this + * function should call it with tail == head + * + * @state The current variable lowering state + */ +static void +emit_copy_load_store(nir_intrinsic_instr *copy_instr, + nir_deref_var *dest_head, nir_deref_var *src_head, + nir_deref *dest_tail, nir_deref *src_tail, void *mem_ctx) +{ + /* Find the next pair of wildcards */ + nir_deref *src_arr_parent = deref_next_wildcard_parent(src_tail); + nir_deref *dest_arr_parent = deref_next_wildcard_parent(dest_tail); + + if (src_arr_parent || dest_arr_parent) { + /* Wildcards had better come in matched pairs */ + assert(dest_arr_parent && dest_arr_parent); + + nir_deref_array *src_arr = nir_deref_as_array(src_arr_parent->child); + nir_deref_array *dest_arr = nir_deref_as_array(dest_arr_parent->child); + + unsigned length = type_get_length(src_arr_parent->type); + /* The wildcards should represent the same number of elements */ + assert(length == type_get_length(dest_arr_parent->type)); + assert(length > 0); + + /* Walk over all of the elements that this wildcard refers to and + * call emit_copy_load_store on each one of them */ + src_arr->deref_array_type = nir_deref_array_type_direct; + dest_arr->deref_array_type = nir_deref_array_type_direct; + for (unsigned i = 0; i < length; i++) { + src_arr->base_offset = i; + dest_arr->base_offset = i; + emit_copy_load_store(copy_instr, dest_head, src_head, + &dest_arr->deref, &src_arr->deref, mem_ctx); + } + src_arr->deref_array_type = nir_deref_array_type_wildcard; + dest_arr->deref_array_type = nir_deref_array_type_wildcard; + } else { + /* In this case, we have no wildcards anymore, so all we have to do + * is just emit the load and store operations. */ + src_tail = get_deref_tail(src_tail); + dest_tail = get_deref_tail(dest_tail); + + assert(src_tail->type == dest_tail->type); + + unsigned num_components = glsl_get_vector_elements(src_tail->type); + + nir_deref *src_deref = nir_copy_deref(mem_ctx, &src_head->deref); + nir_deref *dest_deref = nir_copy_deref(mem_ctx, &dest_head->deref); + + nir_intrinsic_instr *load = + nir_intrinsic_instr_create(mem_ctx, nir_intrinsic_load_var); + load->num_components = num_components; + load->variables[0] = nir_deref_as_var(src_deref); + load->dest.is_ssa = true; + nir_ssa_def_init(&load->instr, &load->dest.ssa, num_components, NULL); + + nir_instr_insert_before(©_instr->instr, &load->instr); + + nir_intrinsic_instr *store = + nir_intrinsic_instr_create(mem_ctx, nir_intrinsic_store_var); + store->num_components = num_components; + store->variables[0] = nir_deref_as_var(dest_deref); + store->src[0].is_ssa = true; + store->src[0].ssa = &load->dest.ssa; + + nir_instr_insert_before(©_instr->instr, &store->instr); + } +} + +/* Lowers a copy instruction to a sequence of load/store instructions + * + * The new instructions are placed before the copy instruction in the IR. + */ +void +nir_lower_var_copy_instr(nir_intrinsic_instr *copy, void *mem_ctx) +{ + assert(copy->intrinsic == nir_intrinsic_copy_var); + emit_copy_load_store(copy, copy->variables[0], copy->variables[1], + ©->variables[0]->deref, + ©->variables[1]->deref, mem_ctx); +} + +static bool +lower_var_copies_block(nir_block *block, void *mem_ctx) +{ + nir_foreach_instr_safe(block, instr) { + if (instr->type != nir_instr_type_intrinsic) + continue; + + nir_intrinsic_instr *copy = nir_instr_as_intrinsic(instr); + if (copy->intrinsic != nir_intrinsic_copy_var) + continue; + + nir_lower_var_copy_instr(copy, mem_ctx); + + nir_instr_remove(©->instr); + ralloc_free(copy); + } + + return true; +} + +static void +lower_var_copies_impl(nir_function_impl *impl) +{ + nir_foreach_block(impl, lower_var_copies_block, ralloc_parent(impl)); +} + +/* Lowers every copy_var instruction in the program to a sequence of + * load/store instructions. + */ +void +nir_lower_var_copies(nir_shader *shader) +{ + nir_foreach_overload(shader, overload) { + if (overload->impl) + lower_var_copies_impl(overload->impl); + } +} |