| /* |
| * 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; |
| } |
