/* * 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 "nir_builder.h" #include "nir_deref.h" #include "compiler/nir_types.h" /* * Lowers all copy intrinsics to sequences of load/store intrinsics. */ static nir_deref_instr * build_deref_to_next_wildcard(nir_builder *b, nir_deref_instr *parent, nir_deref_instr ***deref_arr) { for (; **deref_arr; (*deref_arr)++) { if ((**deref_arr)->deref_type == nir_deref_type_array_wildcard) return parent; parent = nir_build_deref_follower(b, parent, **deref_arr); } assert(**deref_arr == NULL); *deref_arr = NULL; return parent; } static void emit_deref_copy_load_store(nir_builder *b, nir_deref_instr *dst_deref, nir_deref_instr **dst_deref_arr, nir_deref_instr *src_deref, nir_deref_instr **src_deref_arr) { if (dst_deref_arr || src_deref_arr) { assert(dst_deref_arr && src_deref_arr); dst_deref = build_deref_to_next_wildcard(b, dst_deref, &dst_deref_arr); src_deref = build_deref_to_next_wildcard(b, src_deref, &src_deref_arr); } if (dst_deref_arr || src_deref_arr) { assert(dst_deref_arr && src_deref_arr); assert((*dst_deref_arr)->deref_type == nir_deref_type_array_wildcard); assert((*src_deref_arr)->deref_type == nir_deref_type_array_wildcard); unsigned length = glsl_get_length(src_deref->type); /* The wildcards should represent the same number of elements */ assert(length == glsl_get_length(dst_deref->type)); assert(length > 0); for (unsigned i = 0; i < length; i++) { nir_ssa_def *index = nir_imm_int(b, i); emit_deref_copy_load_store(b, nir_build_deref_array(b, dst_deref, index), dst_deref_arr + 1, nir_build_deref_array(b, src_deref, index), src_deref_arr + 1); } } else { assert(dst_deref->type == src_deref->type); assert(glsl_type_is_vector_or_scalar(dst_deref->type)); nir_store_deref(b, dst_deref, nir_load_deref(b, src_deref), ~0); } } void nir_lower_deref_copy_instr(nir_builder *b, nir_intrinsic_instr *copy) { /* Unfortunately, there's just no good way to handle wildcards except to * flip the chain around and walk the list from variable to final pointer. */ assert(copy->src[0].is_ssa && copy->src[1].is_ssa); nir_deref_instr *dst = nir_instr_as_deref(copy->src[0].ssa->parent_instr); nir_deref_instr *src = nir_instr_as_deref(copy->src[1].ssa->parent_instr); nir_deref_path dst_path, src_path; nir_deref_path_init(&dst_path, dst, NULL); nir_deref_path_init(&src_path, src, NULL); b->cursor = nir_before_instr(©->instr); emit_deref_copy_load_store(b, dst_path.path[0], &dst_path.path[1], src_path.path[0], &src_path.path[1]); nir_deref_path_finish(&dst_path); nir_deref_path_finish(&src_path); } static bool lower_var_copies_impl(nir_function_impl *impl) { bool progress = false; nir_builder b; nir_builder_init(&b, impl); nir_foreach_block(block, impl) { nir_foreach_instr_safe(instr, block) { if (instr->type != nir_instr_type_intrinsic) continue; nir_intrinsic_instr *copy = nir_instr_as_intrinsic(instr); if (copy->intrinsic != nir_intrinsic_copy_deref) continue; nir_lower_deref_copy_instr(&b, copy); nir_instr_remove(©->instr); nir_deref_instr_remove_if_unused(nir_src_as_deref(copy->src[0])); nir_deref_instr_remove_if_unused(nir_src_as_deref(copy->src[1])); progress = true; ralloc_free(copy); } } if (progress) { nir_metadata_preserve(impl, nir_metadata_block_index | nir_metadata_dominance); } else { #ifndef NDEBUG impl->valid_metadata &= ~nir_metadata_not_properly_reset; #endif } return progress; } /* Lowers every copy_var instruction in the program to a sequence of * load/store instructions. */ bool nir_lower_var_copies(nir_shader *shader) { bool progress = false; nir_foreach_function(function, shader) { if (function->impl) progress |= lower_var_copies_impl(function->impl); } return progress; }