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Diffstat (limited to 'src/glsl/nir/nir_lower_var_copies.c')
| -rw-r--r-- | src/glsl/nir/nir_lower_var_copies.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/src/glsl/nir/nir_lower_var_copies.c b/src/glsl/nir/nir_lower_var_copies.c deleted file mode 100644 index 8cb3edd..0000000 --- a/src/glsl/nir/nir_lower_var_copies.c +++ /dev/null @@ -1,190 +0,0 @@ -/* - * 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 (jason@jlekstrand.net) - * - */ - -#include "nir.h" -#include "compiler/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; -} - -/* 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 = glsl_get_length(src_arr_parent->type); - /* The wildcards should represent the same number of elements */ - assert(length == glsl_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 = nir_deref_tail(src_tail); - dest_tail = nir_deref_tail(dest_tail); - - assert(src_tail->type == dest_tail->type); - - unsigned num_components = glsl_get_vector_elements(src_tail->type); - - 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(nir_copy_deref(load, &src_head->deref)); - nir_ssa_dest_init(&load->instr, &load->dest, 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->const_index[0] = (1 << num_components) - 1; - store->variables[0] = nir_deref_as_var(nir_copy_deref(store, &dest_head->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_function(shader, function) { - if (function->impl) - lower_var_copies_impl(function->impl); - } -} |