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25 * \file ir_mod_to_floor.cpp
27 * Breaks an ir_unop_mod expression down to (op1 * fract(op0 / op1))
29 * Many GPUs don't have a MOD instruction (945 and 965 included), and
30 * if we have to break it down like this anyway, it gives an
31 * opportunity to do things like constant fold the (1.0 / op1) easily.
36 class ir_mod_to_fract_visitor
: public ir_hierarchical_visitor
{
38 ir_mod_to_fract_visitor()
40 this->made_progress
= false;
43 ir_visitor_status
visit_leave(ir_expression
*);
49 do_mod_to_fract(exec_list
*instructions
)
51 ir_mod_to_fract_visitor v
;
53 visit_list_elements(&v
, instructions
);
54 return v
.made_progress
;
58 ir_mod_to_fract_visitor::visit_leave(ir_expression
*ir
)
60 if (ir
->operation
!= ir_binop_mod
)
61 return visit_continue
;
63 ir_variable
*temp
= new(ir
) ir_variable(ir
->operands
[1]->type
, "mod_b",
65 this->base_ir
->insert_before(temp
);
67 ir_assignment
*assign
;
70 assign
= new(ir
) ir_assignment(new(ir
) ir_dereference_variable(temp
),
71 ir
->operands
[1], NULL
);
72 this->base_ir
->insert_before(assign
);
74 expr
= new(ir
) ir_expression(ir_binop_div
,
75 ir
->operands
[0]->type
,
77 new(ir
) ir_dereference_variable(temp
));
79 expr
= new(ir
) ir_expression(ir_unop_fract
,
80 ir
->operands
[0]->type
,
84 ir
->operation
= ir_binop_mul
;
85 ir
->operands
[0] = new(ir
) ir_dereference_variable(temp
);
86 ir
->operands
[1] = expr
;
87 this->made_progress
= true;
89 return visit_continue
;