ir_visitor_status
ir_constant_variable_visitor::visit(ir_variable *ir)
{
struct assignment_entry *entry = get_assignment_entry(ir, this->ht);
entry->our_scope = true;
return visit_continue;
}
ir_visitor_status
ir_constant_variable_visitor::visit_enter(ir_assignment *ir)
{
ir_constant *constval;
struct assignment_entry *entry;
entry = get_assignment_entry(ir->lhs->variable_referenced(), this->ht);
assert(entry);
entry->assignment_count++;
/* If it's already constant, don't do the work. */
if (entry->var->constant_value)
return visit_continue;
/* OK, now find if we actually have all the right conditions for
* this to be a constant value assigned to the var.
*/
if (ir->condition)
return visit_continue;
ir_variable *var = ir->whole_variable_written();
if (!var)
return visit_continue;
/* Ignore buffer variables, since the underlying storage is shared
* and we can't be sure that this variable won't be written by another
* thread.
*/
if (var->data.mode == ir_var_shader_storage ||
var->data.mode == ir_var_shader_shared)
return visit_continue;
constval = ir->rhs->constant_expression_value();
if (!constval)
return visit_continue;
/* Mark this entry as having a constant assignment (if the
* assignment count doesn't go >1). do_constant_variable will fix
* up the variable with the constant value later.
*/
entry->constval = constval;
return visit_continue;
}
ir_visitor_status
ir_constant_variable_visitor::visit_enter(ir_assignment *ir)
{
ir_constant *constval;
struct assignment_entry *entry;
entry = get_assignment_entry(ir->lhs->variable_referenced(), &this->list);
assert(entry);
entry->assignment_count++;
/* If it's already constant, don't do the work. */
if (entry->var->constant_value)
return visit_continue;
/* OK, now find if we actually have all the right conditions for
* this to be a constant value assigned to the var.
*/
if (ir->condition)
return visit_continue;
ir_variable *var = ir->whole_variable_written();
if (!var)
return visit_continue;
constval = ir->rhs->constant_expression_value();
if (!constval)
return visit_continue;
/* Mark this entry as having a constant assignment (if the
* assignment count doesn't go >1). do_constant_variable will fix
* up the variable with the constant value later.
*/
entry->constval = constval;
return visit_continue;
}
