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glsl2: Don't mark a variable as constant if it was used as an out param.

This commit is contained in:
Eric Anholt 2010-07-20 14:21:43 -07:00
parent 02d3711a21
commit 2927c81ed1
1 changed files with 23 additions and 0 deletions
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23
src/glsl/ir_constant_variable.cpp
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@ -47,6 +47,7 @@ struct assignment_entry {
class ir_constant_variable_visitor : public ir_hierarchical_visitor {
public:
virtual ir_visitor_status visit_enter(ir_assignment *);
virtual ir_visitor_status visit_enter(ir_call *);
exec_list list;
};
@ -107,6 +108,28 @@ ir_constant_variable_visitor::visit_enter(ir_assignment *ir)
return visit_continue;
}
ir_visitor_status
ir_constant_variable_visitor::visit_enter(ir_call *ir)
{
exec_list_iterator sig_iter = ir->get_callee()->parameters.iterator();
foreach_iter(exec_list_iterator, iter, *ir) {
ir_rvalue *param_rval = (ir_rvalue *)iter.get();
ir_variable *param = (ir_variable *)sig_iter.get();
if (param->mode == ir_var_out ||
param->mode == ir_var_inout) {
ir_variable *var = param_rval->variable_referenced();
struct assignment_entry *entry;
assert(var);
entry = get_assignment_entry(var, &this->list);
entry->assignment_count++;
}
sig_iter.next();
}
return visit_continue;
}
/**
* Does a copy propagation pass on the code present in the instruction stream.
*/