[Mesa-dev] [PATCH v3 (part2) 10/56] glsl: Lower unsized array's length calculation expression
Jordan Justen
jordan.l.justen at intel.com
Tue Aug 4 15:57:03 PDT 2015
On 2015-07-14 00:46:12, Iago Toral Quiroga wrote:
> From: Samuel Iglesias Gonsalvez <siglesias at igalia.com>
>
> Signed-off-by: Samuel Iglesias Gonsalvez <siglesias at igalia.com>
> ---
> src/glsl/lower_ubo_reference.cpp | 179 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 179 insertions(+)
>
> diff --git a/src/glsl/lower_ubo_reference.cpp b/src/glsl/lower_ubo_reference.cpp
> index 8b08107..9d0a796 100644
> --- a/src/glsl/lower_ubo_reference.cpp
> +++ b/src/glsl/lower_ubo_reference.cpp
> @@ -166,6 +166,16 @@ public:
> bool row_major, int matrix_columns,
> unsigned write_mask);
>
> + ir_visitor_status visit_enter(class ir_expression *);
> + void check_ssbo_unsized_array_length_expression(class ir_expression *);
> + void check_ssbo_unsized_array_length_assignment(ir_assignment *ir);
> +
> + ir_expression *process_ssbo_unsized_array_length(ir_rvalue **, ir_dereference *, ir_variable *);
> + ir_expression *emit_ssbo_unsized_array_length(ir_variable *base_offset,
> + unsigned int deref_offset,
> + unsigned int unsized_array_stride);
> + unsigned calculate_unsized_array_stride(ir_dereference *deref);
> +
> void *mem_ctx;
> struct gl_shader *shader;
> struct gl_uniform_buffer_variable *ubo_var;
> @@ -738,6 +748,174 @@ lower_ubo_reference_visitor::write_to_memory(ir_dereference *deref,
> row_major, matrix_columns, write_mask);
> }
>
> +ir_visitor_status
> +lower_ubo_reference_visitor::visit_enter(ir_expression *ir)
> +{
> + check_ssbo_unsized_array_length_expression(ir);
> + return rvalue_visit(ir);
> +}
> +
> +void
> +lower_ubo_reference_visitor::check_ssbo_unsized_array_length_expression(ir_expression *former_ir)
> +{
> + if (former_ir->operation == ir_expression_operation(ir_unop_ssbo_unsized_array_length)) {
> + /* Don't replace this unop if it is found alone. It is going to be
> + * removed by the optimization passes or replaced if it is part of
> + * an ir_assignment or another ir_expression.
> + */
> + return;
> + }
> +
> + for (unsigned i = 0; i < 4; i++) {
> + if (!former_ir->operands[i] || former_ir->operands[i]->ir_type != ir_type_expression)
> + continue;
How about this?
for (unsigned i = 0; i < former_ir->get_num_operands(); i++) {
if (former_ir->operands[i]->ir_type != ir_type_expression)
continue;
> + ir_expression *ir = (ir_expression *) former_ir->operands[i];
> + if (ir->operation == ir_expression_operation(ir_unop_ssbo_unsized_array_length)) {
> + ir_rvalue *rvalue = ir->operands[0]->as_rvalue();
> + if (!rvalue || !rvalue->type->is_array() || !rvalue->type->is_unsized_array())
> + return;
> +
> + ir_dereference *deref = ir->operands[0]->as_dereference();
> + if (!deref)
> + return;
> +
> + ir_variable *var = ir->operands[0]->variable_referenced();
> + if (!var || !var->is_in_shader_storage_block())
> + return;
> + /* Now replace the unop instruction for the triop */
> + ir_expression *temp = process_ssbo_unsized_array_length(&rvalue, deref, var);
> + delete ir;
> + former_ir->operands[i] = temp;
> + }
> + }
> +}
> +
> +void
> +lower_ubo_reference_visitor::check_ssbo_unsized_array_length_assignment(ir_assignment *ir)
> +{
> + if (!ir->rhs || ir->rhs->ir_type != ir_type_expression)
> + return;
> +
> + ir_expression *expr = (ir_expression *) ir->rhs;
> + if (expr->operation == ir_expression_operation(ir_unop_ssbo_unsized_array_length)) {
> + ir_rvalue *rvalue = expr->operands[0]->as_rvalue();
> + if (!rvalue || !rvalue->type->is_array() || !rvalue->type->is_unsized_array())
> + return;
> +
> + ir_dereference *deref = expr->operands[0]->as_dereference();
> + if (!deref)
> + return;
> +
> + ir_variable *var = expr->operands[0]->variable_referenced();
> + if (!var || !var->is_in_shader_storage_block())
> + return;
> + /* Now replace the unop instruction for the binop */
triop, right?
> + ir_expression *temp = process_ssbo_unsized_array_length(&rvalue, deref, var);
> + delete expr;
> + ir->rhs = temp;
> + return;
> + }
> + return;
> +}
> +
> +ir_expression *
> +lower_ubo_reference_visitor::emit_ssbo_unsized_array_length(ir_variable *base_offset,
> + unsigned int deref_offset,
> + unsigned int unsized_array_stride)
> +{
> + ir_rvalue *offset =
> + add(base_offset, new(mem_ctx) ir_constant(deref_offset));
> + ir_rvalue *stride = new(mem_ctx) ir_constant(unsized_array_stride);
> + ir_rvalue *block_ref = this->uniform_block->clone(mem_ctx, NULL);
> + return new(mem_ctx) ir_expression(ir_triop_ssbo_unsized_array_length,
> + glsl_type::int_type, block_ref, offset, stride);
> +}
> +
> +unsigned
> +lower_ubo_reference_visitor::calculate_unsized_array_stride(ir_dereference *deref)
> +{
> + unsigned array_stride = 0;
> +
> + switch (deref->ir_type) {
> + case ir_type_dereference_variable:
> + {
> + ir_dereference_variable *deref_var = (ir_dereference_variable *)deref;
> + const struct glsl_type *unsized_array_type = NULL;
> + /* An unsized array can be sized by other lowering passes, so pick
> + * the first field of the array which has the data type of the unsized
> + * array.
> + */
> + unsized_array_type = deref_var->var->type->fields.array;
> +
> + /* Whether or not the field is row-major (because it might be a
> + * bvec2 or something) does not affect the array itself. We need
Indent issue in comment.
-Jordan
> + * to know whether an array element in its entirety is row-major.
> + */
> + const bool array_row_major =
> + is_dereferenced_thing_row_major(deref_var);
> +
> + array_stride = unsized_array_type->std140_size(array_row_major);
> + array_stride = glsl_align(array_stride, 16);
> + break;
> + }
> + case ir_type_dereference_record:
> + {
> + ir_dereference_record *deref_record = (ir_dereference_record *) deref;
> + const struct glsl_type *deref_record_type =
> + deref_record->record->as_dereference()->type;
> + unsigned record_length = deref_record_type->length;
> + /* Unsized array is always the last element of the interface */
> + const struct glsl_type *unsized_array_type =
> + deref_record_type->fields.structure[record_length - 1].type->fields.array;
> +
> + const bool array_row_major =
> + is_dereferenced_thing_row_major(deref_record);
> + array_stride = unsized_array_type->std140_size(array_row_major);
> + array_stride = glsl_align(array_stride, 16);
> + break;
> + }
> + default:
> + assert(!"Not reached");
> + }
> + return array_stride;
> +}
> +
> +ir_expression *
> +lower_ubo_reference_visitor::process_ssbo_unsized_array_length(ir_rvalue **rvalue,
> + ir_dereference *deref,
> + ir_variable *var)
> +{
> + mem_ctx = ralloc_parent(*rvalue);
> +
> + ir_rvalue *offset = NULL;
> + unsigned const_offset;
> + bool row_major;
> + int matrix_columns;
> + unsigned unsized_array_stride = calculate_unsized_array_stride(deref);
> +
> + /* Compute the offset to the start if the dereference as well as other
> + * information we need to configure the length
> + */
> + setup_for_load_or_store(var, deref,
> + &offset, &const_offset,
> + &row_major, &matrix_columns);
> +
> + /* Now that we've calculated the offset to the start of the
> + * dereference, emit writes from the temporary to memory
> + */
> + ir_variable *write_offset = new(mem_ctx) ir_variable(glsl_type::uint_type,
> + "ssbo_length_temp_offset",
> + ir_var_temporary);
> + base_ir->insert_after(write_offset);
> + base_ir->insert_after(assign(write_offset, offset));
> +
> + ir_expression *new_ssbo = emit_ssbo_unsized_array_length(write_offset,
> + const_offset,
> + unsized_array_stride);
> +
> + return new_ssbo;
> +}
> +
> void
> lower_ubo_reference_visitor::check_for_ssbo_store(ir_assignment *ir)
> {
> @@ -777,6 +955,7 @@ lower_ubo_reference_visitor::check_for_ssbo_store(ir_assignment *ir)
> ir_visitor_status
> lower_ubo_reference_visitor::visit_enter(ir_assignment *ir)
> {
> + check_ssbo_unsized_array_length_assignment(ir);
> check_for_ssbo_store(ir);
> return rvalue_visit(ir);
> }
> --
> 1.9.1
>
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