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25 * \file opt_noop_swizzle.cpp
27 * If a swizzle doesn't change the order or count of components, then
28 * remove the swizzle so that other optimization passes see the value
33 #include "ir_visitor.h"
34 #include "ir_rvalue_visitor.h"
35 #include "glsl_types.h"
39 class ir_noop_swizzle_visitor
: public ir_rvalue_visitor
{
41 ir_noop_swizzle_visitor()
43 this->progress
= false;
46 void handle_rvalue(ir_rvalue
**rvalue
);
50 } /* unnamed namespace */
53 ir_noop_swizzle_visitor::handle_rvalue(ir_rvalue
**rvalue
)
58 ir_swizzle
*swiz
= (*rvalue
)->as_swizzle();
59 if (!swiz
|| swiz
->type
!= swiz
->val
->type
)
62 int elems
= swiz
->val
->type
->vector_elements
;
63 if (swiz
->mask
.x
!= 0)
65 if (elems
>= 2 && swiz
->mask
.y
!= 1)
67 if (elems
>= 3 && swiz
->mask
.z
!= 2)
69 if (elems
>= 4 && swiz
->mask
.w
!= 3)
72 this->progress
= true;
77 do_noop_swizzle(exec_list
*instructions
)
79 ir_noop_swizzle_visitor v
;
80 visit_list_elements(&v
, instructions
);