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25 * \file ir_expression_flattening.cpp
27 * Takes the leaves of expression trees and makes them dereferences of
28 * assignments of the leaves to temporaries, according to a predicate.
30 * This is used for breaking down matrix operations, where it's easier to
31 * create a temporary and work on each of its vector components individually.
35 #include "ir_visitor.h"
36 #include "ir_rvalue_visitor.h"
37 #include "ir_expression_flattening.h"
38 #include "glsl_types.h"
40 class ir_expression_flattening_visitor
: public ir_rvalue_visitor
{
42 ir_expression_flattening_visitor(bool (*predicate
)(ir_instruction
*ir
))
44 this->predicate
= predicate
;
47 virtual ~ir_expression_flattening_visitor()
52 void handle_rvalue(ir_rvalue
**rvalue
);
53 bool (*predicate
)(ir_instruction
*ir
);
57 do_expression_flattening(exec_list
*instructions
,
58 bool (*predicate
)(ir_instruction
*ir
))
60 ir_expression_flattening_visitor
v(predicate
);
62 foreach_iter(exec_list_iterator
, iter
, *instructions
) {
63 ir_instruction
*ir
= (ir_instruction
*)iter
.get();
70 ir_expression_flattening_visitor::handle_rvalue(ir_rvalue
**rvalue
)
73 ir_assignment
*assign
;
74 ir_rvalue
*ir
= *rvalue
;
76 if (!ir
|| !this->predicate(ir
))
79 void *ctx
= ralloc_parent(ir
);
81 var
= new(ctx
) ir_variable(ir
->type
, "flattening_tmp", ir_var_temporary
);
82 base_ir
->insert_before(var
);
84 assign
= new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
87 base_ir
->insert_before(assign
);
89 *rvalue
= new(ctx
) ir_dereference_variable(var
);