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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_rvalue_visitor.h"
36 #include "ir_expression_flattening.h"
38 class ir_expression_flattening_visitor
: public ir_rvalue_visitor
{
40 ir_expression_flattening_visitor(bool (*predicate
)(ir_instruction
*ir
))
42 this->predicate
= predicate
;
45 virtual ~ir_expression_flattening_visitor()
50 void handle_rvalue(ir_rvalue
**rvalue
);
51 bool (*predicate
)(ir_instruction
*ir
);
55 do_expression_flattening(exec_list
*instructions
,
56 bool (*predicate
)(ir_instruction
*ir
))
58 ir_expression_flattening_visitor
v(predicate
);
60 foreach_in_list(ir_instruction
, ir
, instructions
) {
66 ir_expression_flattening_visitor::handle_rvalue(ir_rvalue
**rvalue
)
69 ir_assignment
*assign
;
70 ir_rvalue
*ir
= *rvalue
;
72 if (!ir
|| !this->predicate(ir
))
75 void *ctx
= ralloc_parent(ir
);
77 var
= new(ctx
) ir_variable(ir
->type
, "flattening_tmp", ir_var_temporary
);
78 base_ir
->insert_before(var
);
80 assign
= new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
), ir
);
81 base_ir
->insert_before(assign
);
83 *rvalue
= new(ctx
) ir_dereference_variable(var
);