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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 automatic function inlining, where we want to take
31 * an expression containing a call and move the call out to its own
32 * assignment so that we can inline it at the appropriate place in the
37 #include "ir_visitor.h"
38 #include "ir_expression_flattening.h"
39 #include "glsl_types.h"
41 class ir_expression_flattening_visitor
: public ir_hierarchical_visitor
{
43 ir_expression_flattening_visitor(ir_instruction
*base_ir
,
44 bool (*predicate
)(ir_instruction
*ir
))
46 this->base_ir
= base_ir
;
47 this->predicate
= predicate
;
50 virtual ~ir_expression_flattening_visitor()
55 virtual ir_visitor_status
visit_enter(ir_call
*);
56 virtual ir_visitor_status
visit_enter(ir_return
*);
57 virtual ir_visitor_status
visit_enter(ir_function_signature
*);
58 virtual ir_visitor_status
visit_enter(ir_if
*);
59 virtual ir_visitor_status
visit_enter(ir_loop
*);
60 virtual ir_visitor_status
visit_leave(ir_expression
*);
61 virtual ir_visitor_status
visit_leave(ir_swizzle
*);
63 bool (*predicate
)(ir_instruction
*ir
);
64 ir_instruction
*base_ir
;
68 do_expression_flattening(exec_list
*instructions
,
69 bool (*predicate
)(ir_instruction
*ir
))
71 foreach_iter(exec_list_iterator
, iter
, *instructions
) {
72 ir_instruction
*ir
= (ir_instruction
*)iter
.get();
74 ir_expression_flattening_visitor
v(ir
, predicate
);
81 operand_to_temp(ir_instruction
*base_ir
, ir_rvalue
*ir
)
83 void *ctx
= talloc_parent(base_ir
);
85 ir_assignment
*assign
;
87 var
= new(ctx
) ir_variable(ir
->type
, "flattening_tmp");
88 base_ir
->insert_before(var
);
90 assign
= new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
93 base_ir
->insert_before(assign
);
95 return new(ctx
) ir_dereference_variable(var
);
99 ir_expression_flattening_visitor::visit_enter(ir_function_signature
*ir
)
101 do_expression_flattening(&ir
->body
, this->predicate
);
103 return visit_continue_with_parent
;
107 ir_expression_flattening_visitor::visit_enter(ir_loop
*ir
)
109 do_expression_flattening(&ir
->body_instructions
, this->predicate
);
111 return visit_continue_with_parent
;
115 ir_expression_flattening_visitor::visit_enter(ir_if
*ir
)
117 ir
->condition
->accept(this);
119 do_expression_flattening(&ir
->then_instructions
, this->predicate
);
120 do_expression_flattening(&ir
->else_instructions
, this->predicate
);
122 return visit_continue_with_parent
;
126 ir_expression_flattening_visitor::visit_leave(ir_expression
*ir
)
128 unsigned int operand
;
130 for (operand
= 0; operand
< ir
->get_num_operands(); operand
++) {
131 /* If the operand matches the predicate, then we'll assign its
132 * value to a temporary and deref the temporary as the operand.
134 if (this->predicate(ir
->operands
[operand
])) {
135 ir
->operands
[operand
] = operand_to_temp(base_ir
,
136 ir
->operands
[operand
]);
140 return visit_continue
;
144 ir_expression_flattening_visitor::visit_leave(ir_swizzle
*ir
)
146 if (this->predicate(ir
->val
)) {
147 ir
->val
= operand_to_temp(this->base_ir
, ir
->val
);
150 return visit_continue
;
154 ir_expression_flattening_visitor::visit_enter(ir_call
*ir
)
156 /* FINISHME: Why not process the call parameters? (Same behavior as original
160 return visit_continue_with_parent
;
165 ir_expression_flattening_visitor::visit_enter(ir_return
*ir
)
167 /* FINISHME: Why not process the return value? (Same behavior as original
171 return visit_continue_with_parent
;