ir_visitor_status
ir_vec_index_to_cond_assign_visitor::visit_enter(ir_expression *ir)
{
unsigned int i;
for (i = 0; i < ir->get_num_operands(); i++)
{
ir->operands[i] = convert_vec_index_to_cond_assign(ir->operands[i]);
}
return visit_continue;
}
ir_rvalue *
ir_vec_index_to_cond_assign_visitor::convert_vector_extract_to_cond_assign(ir_rvalue *ir)
{
ir_expression *const expr = ir->as_expression();
if (expr == NULL || expr->operation != ir_binop_vector_extract)
return ir;
return convert_vec_index_to_cond_assign(ralloc_parent(ir),
expr->operands[0],
expr->operands[1],
ir->type);
}
ir_visitor_status
ir_vec_index_to_cond_assign_visitor::visit_leave(ir_assignment *ir)
{
ir_variable *index, *var;
ir_dereference_variable *deref;
ir_assignment *assign;
int i;
ir->rhs = convert_vec_index_to_cond_assign(ir->rhs);
if (ir->condition)
ir->condition = convert_vec_index_to_cond_assign(ir->condition);
/* Last, handle the LHS */
ir_dereference_array *orig_deref = ir->lhs->as_dereference_array();
if (!orig_deref ||
orig_deref->array->type->is_matrix() ||
orig_deref->array->type->is_array())
return visit_continue;
void *mem_ctx = ralloc_parent(ir);
check(orig_deref->array_index->type->base_type == GLSL_TYPE_INT);
exec_list list;
/* Store the index to a temporary to avoid reusing its tree. */
index = new(ir)ir_variable(glsl_type::int_type, "vec_index_tmp_i",
ir_var_temporary);
list.push_tail(index);
deref = new(ir)ir_dereference_variable(index);
assign = new(ir)ir_assignment(deref, orig_deref->array_index, NULL);
list.push_tail(assign);
/* Store the RHS to a temporary to avoid reusing its tree. */
var = new(ir)ir_variable(ir->rhs->type, "vec_index_tmp_v",
ir_var_temporary);
list.push_tail(var);
deref = new(ir)ir_dereference_variable(var);
assign = new(ir)ir_assignment(deref, ir->rhs, NULL);
list.push_tail(assign);
/* Generate a single comparison condition "mask" for all of the components
* in the vector.
*/
ir_rvalue *const cond_deref =
compare_index_block(&list, index, 0,
orig_deref->array->type->vector_elements,
mem_ctx);
/* Generate a conditional move of each vector element to the temp. */
for (i = 0; i < orig_deref->array->type->vector_elements; i++)
{
ir_rvalue *condition_swizzle =
new(ir)ir_swizzle(cond_deref->clone(ir, NULL), i, 0, 0, 0, 1);
/* Just clone the rest of the deref chain when trying to get at the
* underlying variable.
*/
ir_rvalue *swizzle =
new(ir)ir_swizzle(orig_deref->array->clone(mem_ctx, NULL),
i, 0, 0, 0, 1);
deref = new(ir)ir_dereference_variable(var);
assign = new(ir)ir_assignment(swizzle, deref, condition_swizzle);
list.push_tail(assign);
}
/* If the original assignment has a condition, respect that original
* condition! This is acomplished by wrapping the new conditional
* assignments in an if-statement that uses the original condition.
*/
if (ir->condition != NULL)
{
/* No need to clone the condition because the IR that it hangs on is
* going to be removed from the instruction sequence.
*/
ir_if *if_stmt = new(mem_ctx)ir_if(ir->condition);
list.move_nodes_to(&if_stmt->then_instructions);
ir->insert_before(if_stmt);
}
else
{
ir->insert_before(&list);
}
ir->remove();
this->progress = true;
return visit_continue;
}
}
ir->remove();
this->progress = true;
return visit_continue;
}
ir_visitor_status
ir_vec_index_to_cond_assign_visitor::visit_enter(ir_call *ir)
{
foreach_iter(exec_list_iterator, iter, *ir)
{
ir_rvalue *param = (ir_rvalue *)iter.get();
ir_rvalue *new_param = convert_vec_index_to_cond_assign(param);
if (new_param != param)
{
param->replace_with(new_param);
}
}
return visit_continue;
}
ir_visitor_status
ir_vec_index_to_cond_assign_visitor::visit_enter(ir_return *ir)
{
if (ir->value)
{
