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25 * \file ir_vec_index_to_swizzle.cpp
27 * Turns constant indexing into vector types to swizzles. This will
28 * let other swizzle-aware optimization passes catch these constructs,
29 * and codegen backends not have to worry about this case.
34 #include "ir_visitor.h"
35 #include "ir_optimization.h"
36 #include "ir_print_visitor.h"
37 #include "glsl_types.h"
40 * Visitor class for replacing expressions with ir_constant values.
43 class ir_vec_index_to_swizzle_visitor
: public ir_hierarchical_visitor
{
45 ir_vec_index_to_swizzle_visitor()
50 ir_rvalue
*convert_vec_index_to_swizzle(ir_rvalue
*val
);
52 virtual ir_visitor_status
visit_enter(ir_expression
*);
53 virtual ir_visitor_status
visit_enter(ir_swizzle
*);
54 virtual ir_visitor_status
visit_enter(ir_assignment
*);
55 virtual ir_visitor_status
visit_enter(ir_return
*);
56 virtual ir_visitor_status
visit_enter(ir_call
*);
57 virtual ir_visitor_status
visit_enter(ir_if
*);
63 ir_vec_index_to_swizzle_visitor::convert_vec_index_to_swizzle(ir_rvalue
*ir
)
65 ir_dereference_array
*deref
= ir
->as_dereference_array();
66 ir_constant
*ir_constant
;
71 if (deref
->array
->type
->is_matrix() || deref
->array
->type
->is_array())
74 assert(deref
->array_index
->type
->base_type
== GLSL_TYPE_INT
);
75 ir_constant
= deref
->array_index
->constant_expression_value();
79 this->progress
= true;
80 return new ir_swizzle(deref
->array
, ir_constant
->value
.i
[0], 0, 0, 0, 1);
84 ir_vec_index_to_swizzle_visitor::visit_enter(ir_expression
*ir
)
88 for (i
= 0; i
< ir
->get_num_operands(); i
++) {
89 ir
->operands
[i
] = convert_vec_index_to_swizzle(ir
->operands
[i
]);
92 return visit_continue
;
96 ir_vec_index_to_swizzle_visitor::visit_enter(ir_swizzle
*ir
)
98 /* Can't be hit from normal GLSL, since you can't swizzle a scalar (which
99 * the result of indexing a vector is. But maybe at some point we'll end up
100 * using swizzling of scalars for vector construction.
102 ir
->val
= convert_vec_index_to_swizzle(ir
->val
);
104 return visit_continue
;
108 ir_vec_index_to_swizzle_visitor::visit_enter(ir_assignment
*ir
)
110 ir
->lhs
= convert_vec_index_to_swizzle(ir
->lhs
);
111 ir
->rhs
= convert_vec_index_to_swizzle(ir
->rhs
);
113 return visit_continue
;
117 ir_vec_index_to_swizzle_visitor::visit_enter(ir_call
*ir
)
119 foreach_iter(exec_list_iterator
, iter
, *ir
) {
120 ir_rvalue
*param
= (ir_rvalue
*)iter
.get();
121 ir_rvalue
*new_param
= convert_vec_index_to_swizzle(param
);
123 if (new_param
!= param
) {
124 param
->insert_before(new_param
);
129 return visit_continue
;
133 ir_vec_index_to_swizzle_visitor::visit_enter(ir_return
*ir
)
136 ir
->value
= convert_vec_index_to_swizzle(ir
->value
);
139 return visit_continue
;
143 ir_vec_index_to_swizzle_visitor::visit_enter(ir_if
*ir
)
145 ir
->condition
= convert_vec_index_to_swizzle(ir
->condition
);
147 return visit_continue
;
151 do_vec_index_to_swizzle(exec_list
*instructions
)
153 ir_vec_index_to_swizzle_visitor v
;