392 lines
13 KiB
C
392 lines
13 KiB
C
/*
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* Copyright © 2016 Broadcom
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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#include "nir_deref.h"
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/** @file nir_lower_io_to_scalar.c
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*
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* Replaces nir_load_input/nir_store_output operations with num_components !=
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* 1 with individual per-channel operations.
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*/
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static void
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lower_load_input_to_scalar(nir_builder *b, nir_intrinsic_instr *intr)
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{
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b->cursor = nir_before_instr(&intr->instr);
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assert(intr->dest.is_ssa);
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nir_ssa_def *loads[NIR_MAX_VEC_COMPONENTS];
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for (unsigned i = 0; i < intr->num_components; i++) {
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nir_intrinsic_instr *chan_intr =
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nir_intrinsic_instr_create(b->shader, intr->intrinsic);
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nir_ssa_dest_init(&chan_intr->instr, &chan_intr->dest,
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1, intr->dest.ssa.bit_size, NULL);
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chan_intr->num_components = 1;
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nir_intrinsic_set_base(chan_intr, nir_intrinsic_base(intr));
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nir_intrinsic_set_component(chan_intr, nir_intrinsic_component(intr) + i);
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/* offset */
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nir_src_copy(&chan_intr->src[0], &intr->src[0], chan_intr);
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nir_builder_instr_insert(b, &chan_intr->instr);
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loads[i] = &chan_intr->dest.ssa;
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}
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nir_ssa_def_rewrite_uses(&intr->dest.ssa,
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nir_src_for_ssa(nir_vec(b, loads,
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intr->num_components)));
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nir_instr_remove(&intr->instr);
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}
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static void
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lower_store_output_to_scalar(nir_builder *b, nir_intrinsic_instr *intr)
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{
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b->cursor = nir_before_instr(&intr->instr);
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nir_ssa_def *value = nir_ssa_for_src(b, intr->src[0], intr->num_components);
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for (unsigned i = 0; i < intr->num_components; i++) {
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if (!(nir_intrinsic_write_mask(intr) & (1 << i)))
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continue;
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nir_intrinsic_instr *chan_intr =
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nir_intrinsic_instr_create(b->shader, intr->intrinsic);
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chan_intr->num_components = 1;
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nir_intrinsic_set_base(chan_intr, nir_intrinsic_base(intr));
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nir_intrinsic_set_write_mask(chan_intr, 0x1);
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nir_intrinsic_set_component(chan_intr, nir_intrinsic_component(intr) + i);
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/* value */
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chan_intr->src[0] = nir_src_for_ssa(nir_channel(b, value, i));
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/* offset */
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nir_src_copy(&chan_intr->src[1], &intr->src[1], chan_intr);
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nir_builder_instr_insert(b, &chan_intr->instr);
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}
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nir_instr_remove(&intr->instr);
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}
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void
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nir_lower_io_to_scalar(nir_shader *shader, nir_variable_mode mask)
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{
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nir_foreach_function(function, shader) {
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if (function->impl) {
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nir_builder b;
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nir_builder_init(&b, function->impl);
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nir_foreach_block(block, function->impl) {
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nir_foreach_instr_safe(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->num_components == 1)
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continue;
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switch (intr->intrinsic) {
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case nir_intrinsic_load_input:
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if (mask & nir_var_shader_in)
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lower_load_input_to_scalar(&b, intr);
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break;
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case nir_intrinsic_store_output:
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if (mask & nir_var_shader_out)
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lower_store_output_to_scalar(&b, intr);
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break;
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default:
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break;
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}
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}
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}
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}
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}
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}
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static nir_variable **
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get_channel_variables(struct hash_table *ht, nir_variable *var)
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{
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nir_variable **chan_vars;
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struct hash_entry *entry = _mesa_hash_table_search(ht, var);
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if (!entry) {
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chan_vars = (nir_variable **) calloc(4, sizeof(nir_variable *));
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_mesa_hash_table_insert(ht, var, chan_vars);
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} else {
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chan_vars = (nir_variable **) entry->data;
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}
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return chan_vars;
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}
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/*
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* Note that the src deref that we are cloning is the head of the
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* chain of deref instructions from the original intrinsic, but
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* the dst we are cloning to is the tail (because chains of deref
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* instructions are created back to front)
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*/
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static nir_deref_instr *
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clone_deref_array(nir_builder *b, nir_deref_instr *dst_tail,
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const nir_deref_instr *src_head)
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{
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const nir_deref_instr *parent = nir_deref_instr_parent(src_head);
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if (!parent)
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return dst_tail;
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assert(src_head->deref_type == nir_deref_type_array);
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dst_tail = clone_deref_array(b, dst_tail, parent);
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return nir_build_deref_array(b, dst_tail,
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nir_ssa_for_src(b, src_head->arr.index, 1));
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}
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static void
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lower_load_to_scalar_early(nir_builder *b, nir_intrinsic_instr *intr,
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nir_variable *var, struct hash_table *split_inputs,
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struct hash_table *split_outputs)
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{
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b->cursor = nir_before_instr(&intr->instr);
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assert(intr->dest.is_ssa);
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nir_ssa_def *loads[NIR_MAX_VEC_COMPONENTS];
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nir_variable **chan_vars;
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if (var->data.mode == nir_var_shader_in) {
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chan_vars = get_channel_variables(split_inputs, var);
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} else {
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chan_vars = get_channel_variables(split_outputs, var);
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}
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for (unsigned i = 0; i < intr->num_components; i++) {
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nir_variable *chan_var = chan_vars[var->data.location_frac + i];
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if (!chan_vars[var->data.location_frac + i]) {
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chan_var = nir_variable_clone(var, b->shader);
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chan_var->data.location_frac = var->data.location_frac + i;
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chan_var->type = glsl_channel_type(chan_var->type);
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if (var->data.explicit_offset) {
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unsigned comp_size = glsl_get_bit_size(chan_var->type) / 8;
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chan_var->data.offset = var->data.offset + i * comp_size;
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}
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chan_vars[var->data.location_frac + i] = chan_var;
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nir_shader_add_variable(b->shader, chan_var);
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}
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nir_intrinsic_instr *chan_intr =
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nir_intrinsic_instr_create(b->shader, intr->intrinsic);
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nir_ssa_dest_init(&chan_intr->instr, &chan_intr->dest,
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1, intr->dest.ssa.bit_size, NULL);
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chan_intr->num_components = 1;
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nir_deref_instr *deref = nir_build_deref_var(b, chan_var);
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deref = clone_deref_array(b, deref, nir_src_as_deref(intr->src[0]));
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chan_intr->src[0] = nir_src_for_ssa(&deref->dest.ssa);
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if (intr->intrinsic == nir_intrinsic_interp_deref_at_offset ||
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intr->intrinsic == nir_intrinsic_interp_deref_at_sample)
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nir_src_copy(&chan_intr->src[1], &intr->src[1], &chan_intr->instr);
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nir_builder_instr_insert(b, &chan_intr->instr);
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loads[i] = &chan_intr->dest.ssa;
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}
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nir_ssa_def_rewrite_uses(&intr->dest.ssa,
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nir_src_for_ssa(nir_vec(b, loads,
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intr->num_components)));
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/* Remove the old load intrinsic */
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nir_instr_remove(&intr->instr);
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}
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static void
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lower_store_output_to_scalar_early(nir_builder *b, nir_intrinsic_instr *intr,
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nir_variable *var,
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struct hash_table *split_outputs)
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{
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b->cursor = nir_before_instr(&intr->instr);
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nir_ssa_def *value = nir_ssa_for_src(b, intr->src[1], intr->num_components);
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nir_variable **chan_vars = get_channel_variables(split_outputs, var);
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for (unsigned i = 0; i < intr->num_components; i++) {
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if (!(nir_intrinsic_write_mask(intr) & (1 << i)))
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continue;
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nir_variable *chan_var = chan_vars[var->data.location_frac + i];
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if (!chan_vars[var->data.location_frac + i]) {
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chan_var = nir_variable_clone(var, b->shader);
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chan_var->data.location_frac = var->data.location_frac + i;
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chan_var->type = glsl_channel_type(chan_var->type);
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if (var->data.explicit_offset) {
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unsigned comp_size = glsl_get_bit_size(chan_var->type) / 8;
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chan_var->data.offset = var->data.offset + i * comp_size;
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}
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chan_vars[var->data.location_frac + i] = chan_var;
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nir_shader_add_variable(b->shader, chan_var);
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}
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nir_intrinsic_instr *chan_intr =
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nir_intrinsic_instr_create(b->shader, intr->intrinsic);
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chan_intr->num_components = 1;
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nir_intrinsic_set_write_mask(chan_intr, 0x1);
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nir_deref_instr *deref = nir_build_deref_var(b, chan_var);
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deref = clone_deref_array(b, deref, nir_src_as_deref(intr->src[0]));
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chan_intr->src[0] = nir_src_for_ssa(&deref->dest.ssa);
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chan_intr->src[1] = nir_src_for_ssa(nir_channel(b, value, i));
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nir_builder_instr_insert(b, &chan_intr->instr);
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}
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/* Remove the old store intrinsic */
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nir_instr_remove(&intr->instr);
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}
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/*
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* This function is intended to be called earlier than nir_lower_io_to_scalar()
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* i.e. before nir_lower_io() is called.
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*/
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void
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nir_lower_io_to_scalar_early(nir_shader *shader, nir_variable_mode mask)
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{
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struct hash_table *split_inputs = _mesa_pointer_hash_table_create(NULL);
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struct hash_table *split_outputs = _mesa_pointer_hash_table_create(NULL);
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nir_foreach_function(function, shader) {
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if (function->impl) {
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nir_builder b;
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nir_builder_init(&b, function->impl);
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nir_foreach_block(block, function->impl) {
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nir_foreach_instr_safe(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->num_components == 1)
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continue;
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if (intr->intrinsic != nir_intrinsic_load_deref &&
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intr->intrinsic != nir_intrinsic_store_deref &&
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intr->intrinsic != nir_intrinsic_interp_deref_at_centroid &&
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intr->intrinsic != nir_intrinsic_interp_deref_at_sample &&
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intr->intrinsic != nir_intrinsic_interp_deref_at_offset)
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continue;
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nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
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nir_variable_mode mode = deref->mode;
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if (!(mode & mask))
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continue;
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nir_variable *var = nir_deref_instr_get_variable(deref);
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/* TODO: add patch support */
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if (var->data.patch)
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continue;
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/* TODO: add doubles support */
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if (glsl_type_is_64bit(glsl_without_array(var->type)))
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continue;
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if (!(shader->info.stage == MESA_SHADER_VERTEX &&
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mode == nir_var_shader_in) &&
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var->data.location < VARYING_SLOT_VAR0 &&
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var->data.location >= 0)
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continue;
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/* Don't bother splitting if we can't opt away any unused
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* components.
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*/
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if (var->data.always_active_io)
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continue;
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/* Skip types we cannot split */
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if (glsl_type_is_matrix(glsl_without_array(var->type)) ||
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glsl_type_is_struct_or_ifc(glsl_without_array(var->type)))
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continue;
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switch (intr->intrinsic) {
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case nir_intrinsic_interp_deref_at_centroid:
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case nir_intrinsic_interp_deref_at_sample:
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case nir_intrinsic_interp_deref_at_offset:
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case nir_intrinsic_load_deref:
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if ((mask & nir_var_shader_in && mode == nir_var_shader_in) ||
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(mask & nir_var_shader_out && mode == nir_var_shader_out))
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lower_load_to_scalar_early(&b, intr, var, split_inputs,
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split_outputs);
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break;
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case nir_intrinsic_store_deref:
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if (mask & nir_var_shader_out &&
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mode == nir_var_shader_out)
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lower_store_output_to_scalar_early(&b, intr, var,
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split_outputs);
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break;
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default:
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break;
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}
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}
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}
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}
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}
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/* Remove old input from the shaders inputs list */
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hash_table_foreach(split_inputs, entry) {
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nir_variable *var = (nir_variable *) entry->key;
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exec_node_remove(&var->node);
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free(entry->data);
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}
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/* Remove old output from the shaders outputs list */
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hash_table_foreach(split_outputs, entry) {
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nir_variable *var = (nir_variable *) entry->key;
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exec_node_remove(&var->node);
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free(entry->data);
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}
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_mesa_hash_table_destroy(split_inputs, NULL);
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_mesa_hash_table_destroy(split_outputs, NULL);
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nir_remove_dead_derefs(shader);
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}
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