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Replace open coded deref navigation with hierarchical visitors

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This commit is contained in:
Ian Romanick 2010-05-19 13:47:39 +02:00
parent c7b1046a9f
commit 7fe3de6fde
1 changed files with 26 additions and 22 deletions
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48
ir_dead_code_local.cpp
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@ -85,6 +85,29 @@ private:
exec_list *assignments;
};
class array_index_visit : public ir_hierarchical_visitor {
public:
array_index_visit(ir_hierarchical_visitor *v)
{
this->visitor = v;
}
virtual ir_visitor_status visit_enter(class ir_dereference_array *ir)
{
ir->selector.array_index->accept(visitor);
return visit_continue;
}
static void run(ir_instruction *ir, ir_hierarchical_visitor *v)
{
array_index_visit top_visit(v);
ir->accept(& top_visit);
}
ir_hierarchical_visitor *visitor;
};
/**
* Adds an entry to the available copy list if it's a plain assignment
* of a variable to a variable.
@ -94,7 +117,6 @@ process_assignment(ir_assignment *ir, exec_list *assignments)
{
ir_variable *var = NULL;
bool progress = false;
ir_instruction *current;
kill_for_derefs_visitor v(assignments);
/* Kill assignment entries for things used to produce this assignment. */
@ -103,28 +125,10 @@ process_assignment(ir_assignment *ir, exec_list *assignments)
ir->condition->accept(&v);
}
/* Walk down the dereference chain to find the variable at the end
* of it that we're actually modifying. Kill assignment enties used as
* array indices, too.
/* Kill assignment enties used as array indices.
*/
for (current = ir->lhs; current != NULL;) {
ir_swizzle *swiz;
ir_dereference *deref;
if ((swiz = current->as_swizzle())) {
current = swiz->val;
} else if ((deref = current->as_dereference())) {
if (deref->mode == ir_dereference::ir_reference_array)
deref->selector.array_index->accept(&v);
current = deref->var;
} else {
var = current->as_variable();
current = NULL;
break;
}
}
array_index_visit::run(ir->lhs, &v);
var = ir->lhs->variable_referenced();
assert(var);
bool always_assign = true;