| /* |
| * Copyright © 2015 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 "main/menums.h" |
| |
| static void |
| set_io_mask(nir_shader *shader, nir_variable *var, int offset, int len, |
| bool is_output_read) |
| { |
| for (int i = 0; i < len; i++) { |
| assert(var->data.location != -1); |
| |
| int idx = var->data.location + offset + i; |
| bool is_patch_generic = var->data.patch && |
| idx != VARYING_SLOT_TESS_LEVEL_INNER && |
| idx != VARYING_SLOT_TESS_LEVEL_OUTER && |
| idx != VARYING_SLOT_BOUNDING_BOX0 && |
| idx != VARYING_SLOT_BOUNDING_BOX1; |
| uint64_t bitfield; |
| |
| if (is_patch_generic) { |
| assert(idx >= VARYING_SLOT_PATCH0 && idx < VARYING_SLOT_TESS_MAX); |
| bitfield = BITFIELD64_BIT(idx - VARYING_SLOT_PATCH0); |
| } |
| else { |
| assert(idx < VARYING_SLOT_MAX); |
| bitfield = BITFIELD64_BIT(idx); |
| } |
| |
| if (var->data.mode == nir_var_shader_in) { |
| if (is_patch_generic) |
| shader->info.patch_inputs_read |= bitfield; |
| else |
| shader->info.inputs_read |= bitfield; |
| |
| if (shader->info.stage == MESA_SHADER_FRAGMENT) { |
| shader->info.fs.uses_sample_qualifier |= var->data.sample; |
| } |
| } else { |
| assert(var->data.mode == nir_var_shader_out); |
| if (is_output_read) { |
| if (is_patch_generic) { |
| shader->info.patch_outputs_read |= bitfield; |
| } else { |
| shader->info.outputs_read |= bitfield; |
| } |
| } else { |
| if (is_patch_generic) { |
| shader->info.patch_outputs_written |= bitfield; |
| } else if (!var->data.read_only) { |
| shader->info.outputs_written |= bitfield; |
| } |
| } |
| |
| |
| if (var->data.fb_fetch_output) |
| shader->info.outputs_read |= bitfield; |
| } |
| } |
| } |
| |
| /** |
| * Mark an entire variable as used. Caller must ensure that the variable |
| * represents a shader input or output. |
| */ |
| static void |
| mark_whole_variable(nir_shader *shader, nir_variable *var, bool is_output_read) |
| { |
| const struct glsl_type *type = var->type; |
| |
| if (nir_is_per_vertex_io(var, shader->info.stage)) { |
| assert(glsl_type_is_array(type)); |
| type = glsl_get_array_element(type); |
| } |
| |
| const unsigned slots = |
| var->data.compact ? DIV_ROUND_UP(glsl_get_length(type), 4) |
| : glsl_count_attribute_slots(type, false); |
| |
| set_io_mask(shader, var, 0, slots, is_output_read); |
| } |
| |
| static unsigned |
| get_io_offset(nir_deref_instr *deref, bool is_vertex_input) |
| { |
| unsigned offset = 0; |
| |
| for (nir_deref_instr *d = deref; d; d = nir_deref_instr_parent(d)) { |
| if (d->deref_type == nir_deref_type_array) { |
| if (!nir_src_is_const(d->arr.index)) |
| return -1; |
| |
| offset += glsl_count_attribute_slots(d->type, is_vertex_input) * |
| nir_src_as_uint(d->arr.index); |
| } |
| /* TODO: we can get the offset for structs here see nir_lower_io() */ |
| } |
| |
| return offset; |
| } |
| |
| /** |
| * Try to mark a portion of the given varying as used. Caller must ensure |
| * that the variable represents a shader input or output. |
| * |
| * If the index can't be interpreted as a constant, or some other problem |
| * occurs, then nothing will be marked and false will be returned. |
| */ |
| static bool |
| try_mask_partial_io(nir_shader *shader, nir_variable *var, |
| nir_deref_instr *deref, bool is_output_read) |
| { |
| const struct glsl_type *type = var->type; |
| |
| if (nir_is_per_vertex_io(var, shader->info.stage)) { |
| assert(glsl_type_is_array(type)); |
| type = glsl_get_array_element(type); |
| } |
| |
| /* The code below only handles: |
| * |
| * - Indexing into matrices |
| * - Indexing into arrays of (arrays, matrices, vectors, or scalars) |
| * |
| * For now, we just give up if we see varying structs and arrays of structs |
| * here marking the entire variable as used. |
| */ |
| if (!(glsl_type_is_matrix(type) || |
| (glsl_type_is_array(type) && !var->data.compact && |
| (glsl_type_is_numeric(glsl_without_array(type)) || |
| glsl_type_is_boolean(glsl_without_array(type)))))) { |
| |
| /* If we don't know how to handle this case, give up and let the |
| * caller mark the whole variable as used. |
| */ |
| return false; |
| } |
| |
| unsigned offset = get_io_offset(deref, false); |
| if (offset == -1) |
| return false; |
| |
| unsigned num_elems; |
| unsigned elem_width = 1; |
| unsigned mat_cols = 1; |
| if (glsl_type_is_array(type)) { |
| num_elems = glsl_get_aoa_size(type); |
| if (glsl_type_is_matrix(glsl_without_array(type))) |
| mat_cols = glsl_get_matrix_columns(glsl_without_array(type)); |
| } else { |
| num_elems = glsl_get_matrix_columns(type); |
| } |
| |
| /* double element width for double types that takes two slots */ |
| if (glsl_type_is_dual_slot(glsl_without_array(type))) |
| elem_width *= 2; |
| |
| if (offset >= num_elems * elem_width * mat_cols) { |
| /* Constant index outside the bounds of the matrix/array. This could |
| * arise as a result of constant folding of a legal GLSL program. |
| * |
| * Even though the spec says that indexing outside the bounds of a |
| * matrix/array results in undefined behaviour, we don't want to pass |
| * out-of-range values to set_io_mask() (since this could result in |
| * slots that don't exist being marked as used), so just let the caller |
| * mark the whole variable as used. |
| */ |
| return false; |
| } |
| |
| set_io_mask(shader, var, offset, elem_width, is_output_read); |
| return true; |
| } |
| |
| static void |
| gather_intrinsic_info(nir_intrinsic_instr *instr, nir_shader *shader, |
| void *dead_ctx) |
| { |
| switch (instr->intrinsic) { |
| case nir_intrinsic_demote: |
| case nir_intrinsic_demote_if: |
| shader->info.fs.uses_demote = true; |
| /* fallthrough: quads with helper lanes only might be discarded entirely */ |
| case nir_intrinsic_discard: |
| case nir_intrinsic_discard_if: |
| assert(shader->info.stage == MESA_SHADER_FRAGMENT); |
| shader->info.fs.uses_discard = true; |
| break; |
| |
| case nir_intrinsic_interp_deref_at_centroid: |
| case nir_intrinsic_interp_deref_at_sample: |
| case nir_intrinsic_interp_deref_at_offset: |
| case nir_intrinsic_interp_deref_at_vertex: |
| case nir_intrinsic_load_deref: |
| case nir_intrinsic_store_deref:{ |
| nir_deref_instr *deref = nir_src_as_deref(instr->src[0]); |
| if (deref->mode == nir_var_shader_in || |
| deref->mode == nir_var_shader_out) { |
| nir_variable *var = nir_deref_instr_get_variable(deref); |
| bool is_output_read = false; |
| if (var->data.mode == nir_var_shader_out && |
| instr->intrinsic == nir_intrinsic_load_deref) |
| is_output_read = true; |
| |
| if (!try_mask_partial_io(shader, var, deref, is_output_read)) |
| mark_whole_variable(shader, var, is_output_read); |
| |
| /* We need to track which input_reads bits correspond to a |
| * dvec3/dvec4 input attribute */ |
| if (shader->info.stage == MESA_SHADER_VERTEX && |
| var->data.mode == nir_var_shader_in && |
| glsl_type_is_dual_slot(glsl_without_array(var->type))) { |
| for (unsigned i = 0; i < glsl_count_attribute_slots(var->type, false); i++) { |
| int idx = var->data.location + i; |
| shader->info.vs.double_inputs |= BITFIELD64_BIT(idx); |
| } |
| } |
| } |
| break; |
| } |
| |
| case nir_intrinsic_load_draw_id: |
| case nir_intrinsic_load_frag_coord: |
| case nir_intrinsic_load_point_coord: |
| case nir_intrinsic_load_front_face: |
| case nir_intrinsic_load_vertex_id: |
| case nir_intrinsic_load_vertex_id_zero_base: |
| case nir_intrinsic_load_base_vertex: |
| case nir_intrinsic_load_first_vertex: |
| case nir_intrinsic_load_is_indexed_draw: |
| case nir_intrinsic_load_base_instance: |
| case nir_intrinsic_load_instance_id: |
| case nir_intrinsic_load_sample_id: |
| case nir_intrinsic_load_sample_pos: |
| case nir_intrinsic_load_sample_mask_in: |
| case nir_intrinsic_load_primitive_id: |
| case nir_intrinsic_load_invocation_id: |
| case nir_intrinsic_load_local_invocation_id: |
| case nir_intrinsic_load_local_invocation_index: |
| case nir_intrinsic_load_work_group_id: |
| case nir_intrinsic_load_num_work_groups: |
| case nir_intrinsic_load_tess_coord: |
| case nir_intrinsic_load_tess_level_outer: |
| case nir_intrinsic_load_tess_level_inner: |
| case nir_intrinsic_load_patch_vertices_in: |
| shader->info.system_values_read |= |
| (1ull << nir_system_value_from_intrinsic(instr->intrinsic)); |
| break; |
| |
| case nir_intrinsic_quad_broadcast: |
| case nir_intrinsic_quad_swap_horizontal: |
| case nir_intrinsic_quad_swap_vertical: |
| case nir_intrinsic_quad_swap_diagonal: |
| if (shader->info.stage == MESA_SHADER_FRAGMENT) |
| shader->info.fs.needs_helper_invocations = true; |
| break; |
| |
| case nir_intrinsic_end_primitive: |
| case nir_intrinsic_end_primitive_with_counter: |
| assert(shader->info.stage == MESA_SHADER_GEOMETRY); |
| shader->info.gs.uses_end_primitive = 1; |
| /* fall through */ |
| |
| case nir_intrinsic_emit_vertex: |
| if (nir_intrinsic_stream_id(instr) > 0) |
| shader->info.gs.uses_streams = true; |
| |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| static void |
| gather_tex_info(nir_tex_instr *instr, nir_shader *shader) |
| { |
| if (shader->info.stage == MESA_SHADER_FRAGMENT && |
| nir_tex_instr_has_implicit_derivative(instr)) |
| shader->info.fs.needs_helper_invocations = true; |
| |
| switch (instr->op) { |
| case nir_texop_tg4: |
| shader->info.uses_texture_gather = true; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static void |
| gather_alu_info(nir_alu_instr *instr, nir_shader *shader) |
| { |
| switch (instr->op) { |
| case nir_op_fddx: |
| case nir_op_fddy: |
| shader->info.uses_fddx_fddy = true; |
| /* Fall through */ |
| case nir_op_fddx_fine: |
| case nir_op_fddy_fine: |
| case nir_op_fddx_coarse: |
| case nir_op_fddy_coarse: |
| if (shader->info.stage == MESA_SHADER_FRAGMENT) |
| shader->info.fs.needs_helper_invocations = true; |
| break; |
| default: |
| break; |
| } |
| |
| shader->info.uses_64bit |= instr->dest.dest.ssa.bit_size == 64; |
| unsigned num_srcs = nir_op_infos[instr->op].num_inputs; |
| for (unsigned i = 0; i < num_srcs; i++) { |
| shader->info.uses_64bit |= nir_src_bit_size(instr->src[i].src) == 64; |
| } |
| } |
| |
| static void |
| gather_info_block(nir_block *block, nir_shader *shader, void *dead_ctx) |
| { |
| nir_foreach_instr(instr, block) { |
| switch (instr->type) { |
| case nir_instr_type_alu: |
| gather_alu_info(nir_instr_as_alu(instr), shader); |
| break; |
| case nir_instr_type_intrinsic: |
| gather_intrinsic_info(nir_instr_as_intrinsic(instr), shader, dead_ctx); |
| break; |
| case nir_instr_type_tex: |
| gather_tex_info(nir_instr_as_tex(instr), shader); |
| break; |
| case nir_instr_type_call: |
| assert(!"nir_shader_gather_info only works if functions are inlined"); |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| |
| void |
| nir_shader_gather_info(nir_shader *shader, nir_function_impl *entrypoint) |
| { |
| shader->info.num_textures = 0; |
| shader->info.num_images = 0; |
| shader->info.last_msaa_image = -1; |
| nir_foreach_variable(var, &shader->uniforms) { |
| /* Bindless textures and images don't use non-bindless slots. */ |
| if (var->data.bindless) |
| continue; |
| |
| shader->info.num_textures += glsl_type_get_sampler_count(var->type); |
| shader->info.num_images += glsl_type_get_image_count(var->type); |
| |
| /* Assuming image slots don't have holes (e.g. OpenGL) */ |
| if (glsl_type_is_image(var->type) && |
| glsl_get_sampler_dim(var->type) == GLSL_SAMPLER_DIM_MS) |
| shader->info.last_msaa_image = shader->info.num_images - 1; |
| } |
| |
| shader->info.inputs_read = 0; |
| shader->info.outputs_written = 0; |
| shader->info.outputs_read = 0; |
| shader->info.patch_outputs_read = 0; |
| shader->info.patch_inputs_read = 0; |
| shader->info.patch_outputs_written = 0; |
| shader->info.system_values_read = 0; |
| if (shader->info.stage == MESA_SHADER_VERTEX) { |
| shader->info.vs.double_inputs = 0; |
| } |
| if (shader->info.stage == MESA_SHADER_FRAGMENT) { |
| shader->info.fs.uses_sample_qualifier = false; |
| shader->info.fs.uses_discard = false; |
| shader->info.fs.uses_demote = false; |
| shader->info.fs.needs_helper_invocations = false; |
| } |
| |
| void *dead_ctx = ralloc_context(NULL); |
| nir_foreach_block(block, entrypoint) { |
| gather_info_block(block, shader, dead_ctx); |
| } |
| ralloc_free(dead_ctx); |
| } |
