/* * Copyright © 2019 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 "nir_builder.h" static void build_write_masked_store(nir_builder *b, nir_deref_instr *vec_deref, nir_ssa_def *value, unsigned component) { assert(value->num_components == 1); unsigned num_components = glsl_get_components(vec_deref->type); assert(num_components > 1 && num_components <= NIR_MAX_VEC_COMPONENTS); nir_ssa_def *u = nir_ssa_undef(b, 1, value->bit_size); nir_ssa_def *comps[NIR_MAX_VEC_COMPONENTS]; for (unsigned i = 0; i < num_components; i++) comps[i] = (i == component) ? value : u; nir_ssa_def *vec = nir_vec(b, comps, num_components); nir_store_deref(b, vec_deref, vec, (1u << component)); } static void build_write_masked_stores(nir_builder *b, nir_deref_instr *vec_deref, nir_ssa_def *value, nir_ssa_def *index, unsigned start, unsigned end) { if (start == end - 1) { build_write_masked_store(b, vec_deref, value, start); } else { unsigned mid = start + (end - start) / 2; nir_push_if(b, nir_ilt(b, index, nir_imm_int(b, mid))); build_write_masked_stores(b, vec_deref, value, index, start, mid); nir_push_else(b, NULL); build_write_masked_stores(b, vec_deref, value, index, mid, end); nir_pop_if(b, NULL); } } static bool nir_lower_array_deref_of_vec_impl(nir_function_impl *impl, nir_variable_mode modes, nir_lower_array_deref_of_vec_options options) { 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 *intrin = nir_instr_as_intrinsic(instr); assert(intrin->intrinsic != nir_intrinsic_copy_deref); if (intrin->intrinsic != nir_intrinsic_load_deref && intrin->intrinsic != nir_intrinsic_interp_deref_at_centroid && intrin->intrinsic != nir_intrinsic_interp_deref_at_sample && intrin->intrinsic != nir_intrinsic_interp_deref_at_offset && intrin->intrinsic != nir_intrinsic_interp_deref_at_vertex && intrin->intrinsic != nir_intrinsic_store_deref) continue; nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]); if (!(deref->mode & modes)) continue; /* We only care about array derefs that act on vectors */ if (deref->deref_type != nir_deref_type_array) continue; nir_deref_instr *vec_deref = nir_deref_instr_parent(deref); if (!glsl_type_is_vector(vec_deref->type)) continue; assert(intrin->num_components == 1); unsigned num_components = glsl_get_components(vec_deref->type); assert(num_components > 1 && num_components <= NIR_MAX_VEC_COMPONENTS); b.cursor = nir_after_instr(&intrin->instr); if (intrin->intrinsic == nir_intrinsic_store_deref) { assert(intrin->src[1].is_ssa); nir_ssa_def *value = intrin->src[1].ssa; if (nir_src_is_const(deref->arr.index)) { if (!(options & nir_lower_direct_array_deref_of_vec_store)) continue; unsigned index = nir_src_as_uint(deref->arr.index); /* If index is OOB, we throw the old store away and don't * replace it with anything. */ if (index < num_components) build_write_masked_store(&b, vec_deref, value, index); } else { if (!(options & nir_lower_indirect_array_deref_of_vec_store)) continue; nir_ssa_def *index = nir_ssa_for_src(&b, deref->arr.index, 1); build_write_masked_stores(&b, vec_deref, value, index, 0, num_components); } nir_instr_remove(&intrin->instr); progress = true; } else { if (nir_src_is_const(deref->arr.index)) { if (!(options & nir_lower_direct_array_deref_of_vec_load)) continue; } else { if (!(options & nir_lower_indirect_array_deref_of_vec_load)) continue; } /* Turn the load into a vector load */ nir_instr_rewrite_src(&intrin->instr, &intrin->src[0], nir_src_for_ssa(&vec_deref->dest.ssa)); intrin->dest.ssa.num_components = num_components; intrin->num_components = num_components; nir_ssa_def *index = nir_ssa_for_src(&b, deref->arr.index, 1); nir_ssa_def *scalar = nir_vector_extract(&b, &intrin->dest.ssa, index); if (scalar->parent_instr->type == nir_instr_type_ssa_undef) { nir_ssa_def_rewrite_uses(&intrin->dest.ssa, nir_src_for_ssa(scalar)); nir_instr_remove(&intrin->instr); } else { nir_ssa_def_rewrite_uses_after(&intrin->dest.ssa, nir_src_for_ssa(scalar), scalar->parent_instr); } progress = true; } } } if (progress) { nir_metadata_preserve(impl, nir_metadata_block_index | nir_metadata_dominance); } else { nir_metadata_preserve(impl, nir_metadata_all); } return progress; } /* Lowers away array dereferences on vectors * * These are allowed on certain variable types such as SSBOs and TCS outputs. * However, not everyone can actually handle them everywhere. There are also * cases where we want to lower them for performance reasons. * * This patch assumes that copy_deref instructions have already been lowered. */ bool nir_lower_array_deref_of_vec(nir_shader *shader, nir_variable_mode modes, nir_lower_array_deref_of_vec_options options) { bool progress = false; nir_foreach_function(function, shader) { if (function->impl && nir_lower_array_deref_of_vec_impl(function->impl, modes, options)) progress = true; } return progress; }