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25 * \file ir_function_can_inline.cpp
27 * Determines if we can inline a function call using ir_function_inlining.cpp.
29 * The primary restriction is that we can't return from the function
30 * other than as the last instruction. We could potentially work
31 * around this for some constructs by flattening control flow and
32 * moving the return to the end, or by using breaks from a do {} while
33 * (0) loop surrounding the function body.
38 class ir_function_can_inline_visitor
: public ir_hierarchical_visitor
{
40 ir_function_can_inline_visitor()
42 this->can_inline
= true;
43 this->num_returns
= 0;
46 virtual ir_visitor_status
visit_enter(ir_loop
*);
47 virtual ir_visitor_status
visit_enter(ir_return
*);
48 virtual ir_visitor_status
visit_enter(ir_if
*);
55 ir_function_can_inline_visitor::visit_enter(ir_loop
*ir
)
57 /* FINISHME: Implement loop cloning in ir_function_inlining.cpp */
59 this->can_inline
= false;
65 ir_function_can_inline_visitor::visit_enter(ir_return
*ir
)
69 return visit_continue
;
74 ir_function_can_inline_visitor::visit_enter(ir_if
*ir
)
76 /* FINISHME: Implement if cloning in ir_function_inlining.cpp. */
78 this->can_inline
= false;
83 can_inline(ir_call
*call
)
85 ir_function_can_inline_visitor v
;
86 const ir_function_signature
*callee
= call
->get_callee();
88 v
.run((exec_list
*) &callee
->body
);
90 ir_instruction
*last
= (ir_instruction
*)callee
->body
.get_tail();
91 if (last
&& !last
->as_return())
94 return v
.can_inline
&& v
.num_returns
== 1;