306 lines
11 KiB
C
306 lines
11 KiB
C
/*
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* Copyright © 2018 Intel Corporation
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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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struct var_info {
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bool is_constant;
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bool found_read;
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};
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static nir_ssa_def *
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build_constant_load(nir_builder *b, nir_deref_instr *deref,
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glsl_type_size_align_func size_align)
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{
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nir_variable *var = nir_deref_instr_get_variable(deref);
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const unsigned bit_size = glsl_get_bit_size(deref->type);
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const unsigned num_components = glsl_get_vector_elements(deref->type);
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UNUSED unsigned var_size, var_align;
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size_align(var->type, &var_size, &var_align);
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assert(var->data.location % var_align == 0);
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nir_intrinsic_instr *load =
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nir_intrinsic_instr_create(b->shader, nir_intrinsic_load_constant);
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load->num_components = num_components;
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nir_intrinsic_set_base(load, var->data.location);
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nir_intrinsic_set_range(load, var_size);
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load->src[0] = nir_src_for_ssa(nir_build_deref_offset(b, deref, size_align));
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nir_ssa_dest_init(&load->instr, &load->dest,
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num_components, bit_size, NULL);
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nir_builder_instr_insert(b, &load->instr);
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return &load->dest.ssa;
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}
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static void
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handle_constant_store(nir_builder *b, nir_intrinsic_instr *store,
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glsl_type_size_align_func size_align)
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{
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nir_deref_instr *deref = nir_src_as_deref(store->src[0]);
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assert(!nir_deref_instr_has_indirect(deref));
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nir_variable *var = nir_deref_instr_get_variable(deref);
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const unsigned bit_size = glsl_get_bit_size(deref->type);
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const unsigned num_components = glsl_get_vector_elements(deref->type);
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char *dst = (char *)b->shader->constant_data +
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var->data.location +
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nir_deref_instr_get_const_offset(deref, size_align);
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nir_const_value *val = nir_src_as_const_value(store->src[1]);
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switch (bit_size) {
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case 8:
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for (unsigned i = 0; i < num_components; i++)
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((uint8_t *)dst)[i] = val->u8[i];
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break;
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case 16:
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for (unsigned i = 0; i < num_components; i++)
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((uint16_t *)dst)[i] = val->u16[i];
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break;
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case 32:
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for (unsigned i = 0; i < num_components; i++)
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((uint32_t *)dst)[i] = val->u32[i];
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break;
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case 64:
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for (unsigned i = 0; i < num_components; i++)
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((uint64_t *)dst)[i] = val->u64[i];
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break;
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default:
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unreachable("Invalid bit size");
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}
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}
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/** Lower large constant variables to shader constant data
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*
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* This pass looks for large (type_size(var->type) > threshold) variables
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* which are statically constant and moves them into shader constant data.
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* This is especially useful when large tables are baked into the shader
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* source code because they can be moved into a UBO by the driver to reduce
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* register pressure and make indirect access cheaper.
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*/
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bool
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nir_opt_large_constants(nir_shader *shader,
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glsl_type_size_align_func size_align,
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unsigned threshold)
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{
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/* Default to a natural alignment if none is provided */
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if (size_align == NULL)
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size_align = glsl_get_natural_size_align_bytes;
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/* This only works with a single entrypoint */
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nir_function_impl *impl = nir_shader_get_entrypoint(shader);
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/* This pass can only be run once */
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assert(shader->constant_data == NULL && shader->constant_data_size == 0);
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/* The index parameter is unused for local variables so we'll use it for
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* indexing into our array of variable metadata.
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*/
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unsigned num_locals = 0;
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nir_foreach_variable(var, &impl->locals)
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var->data.index = num_locals++;
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struct var_info *var_infos = malloc(num_locals * sizeof(struct var_info));
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for (unsigned i = 0; i < num_locals; i++) {
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var_infos[i] = (struct var_info) {
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.is_constant = true,
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.found_read = false,
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};
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}
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/* First, walk through the shader and figure out what variables we can
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* lower to the constant blob.
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*/
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bool first_block = true;
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nir_foreach_block(block, impl) {
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nir_foreach_instr(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 *intrin = nir_instr_as_intrinsic(instr);
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bool src_is_const = false;
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nir_deref_instr *src_deref = NULL, *dst_deref = NULL;
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switch (intrin->intrinsic) {
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case nir_intrinsic_store_deref:
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dst_deref = nir_src_as_deref(intrin->src[0]);
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src_is_const = nir_src_is_const(intrin->src[1]);
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break;
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case nir_intrinsic_load_deref:
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src_deref = nir_src_as_deref(intrin->src[0]);
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break;
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case nir_intrinsic_copy_deref:
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/* We always assume the src and therefore the dst are not
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* constants here. Copy and constant propagation passes should
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* have taken care of this in most cases anyway.
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*/
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dst_deref = nir_src_as_deref(intrin->src[0]);
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src_deref = nir_src_as_deref(intrin->src[1]);
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src_is_const = false;
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break;
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default:
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continue;
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}
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if (dst_deref && dst_deref->mode == nir_var_local) {
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nir_variable *var = nir_deref_instr_get_variable(dst_deref);
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assert(var->data.mode == nir_var_local);
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/* We only consider variables constant if they only have constant
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* stores, all the stores come before any reads, and all stores
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* come in the first block. We also can't handle indirect stores.
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*/
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struct var_info *info = &var_infos[var->data.index];
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if (!src_is_const || info->found_read || !first_block ||
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nir_deref_instr_has_indirect(dst_deref))
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info->is_constant = false;
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}
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if (src_deref && src_deref->mode == nir_var_local) {
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nir_variable *var = nir_deref_instr_get_variable(src_deref);
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assert(var->data.mode == nir_var_local);
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var_infos[var->data.index].found_read = true;
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}
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}
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first_block = false;
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}
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shader->constant_data_size = 0;
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nir_foreach_variable(var, &impl->locals) {
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struct var_info *info = &var_infos[var->data.index];
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if (!info->is_constant)
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continue;
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unsigned var_size, var_align;
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size_align(var->type, &var_size, &var_align);
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if (var_size <= threshold || !info->found_read) {
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/* Don't bother lowering small stuff or data that's never read */
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info->is_constant = false;
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continue;
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}
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var->data.location = ALIGN_POT(shader->constant_data_size, var_align);
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shader->constant_data_size = var->data.location + var_size;
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}
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if (shader->constant_data_size == 0) {
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free(var_infos);
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return false;
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}
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shader->constant_data = rzalloc_size(shader, shader->constant_data_size);
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nir_builder b;
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nir_builder_init(&b, impl);
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nir_foreach_block(block, 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 *intrin = nir_instr_as_intrinsic(instr);
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switch (intrin->intrinsic) {
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case nir_intrinsic_load_deref: {
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nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]);
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if (deref->mode != nir_var_local)
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continue;
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nir_variable *var = nir_deref_instr_get_variable(deref);
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struct var_info *info = &var_infos[var->data.index];
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if (info->is_constant) {
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b.cursor = nir_after_instr(&intrin->instr);
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nir_ssa_def *val = build_constant_load(&b, deref, size_align);
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nir_ssa_def_rewrite_uses(&intrin->dest.ssa,
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nir_src_for_ssa(val));
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nir_instr_remove(&intrin->instr);
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nir_deref_instr_remove_if_unused(deref);
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}
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break;
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}
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case nir_intrinsic_store_deref: {
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nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]);
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if (deref->mode != nir_var_local)
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continue;
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nir_variable *var = nir_deref_instr_get_variable(deref);
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struct var_info *info = &var_infos[var->data.index];
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if (info->is_constant) {
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b.cursor = nir_after_instr(&intrin->instr);
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handle_constant_store(&b, intrin, size_align);
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nir_instr_remove(&intrin->instr);
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nir_deref_instr_remove_if_unused(deref);
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}
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break;
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}
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case nir_intrinsic_copy_deref: {
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nir_deref_instr *deref = nir_src_as_deref(intrin->src[1]);
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if (deref->mode != nir_var_local)
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continue;
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nir_variable *var = nir_deref_instr_get_variable(deref);
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struct var_info *info = &var_infos[var->data.index];
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if (info->is_constant) {
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b.cursor = nir_after_instr(&intrin->instr);
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nir_ssa_def *val = build_constant_load(&b, deref, size_align);
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nir_store_deref(&b, nir_src_as_deref(intrin->src[0]), val, ~0);
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nir_instr_remove(&intrin->instr);
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nir_deref_instr_remove_if_unused(deref);
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}
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break;
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}
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default:
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continue;
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}
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}
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}
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/* Clean up the now unused variables */
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nir_foreach_variable_safe(var, &impl->locals) {
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if (var_infos[var->data.index].is_constant)
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exec_node_remove(&var->node);
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}
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free(var_infos);
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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return true;
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}
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