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glsl/loops: replace loop controls with a normative bound.

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This patch replaces the ir_loop fields "from", "to", "increment",
"counter", and "cmp" with a single integer ("normative_bound") that
serves the same purpose.

I've used the name "normative_bound" to emphasize the fact that the
back-end is required to emit code to prevent the loop from running
more than normative_bound times.  (By contrast, an "informative" bound
would be a bound that is informational only).

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Paul Berry
2013-11-28 08:13:41 -08:00
parent 2c17f97fe6
commit e00b93a1f7
46 changed files with 103 additions and 246 deletions
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src/glsl/ir_variable_refcount.cpp
-21
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@@ -132,24 +132,3 @@ ir_variable_refcount_visitor::visit_leave(ir_assignment *ir)
return visit_continue;
}
ir_visitor_status
ir_variable_refcount_visitor::visit_leave(ir_loop *ir)
{
/* If the loop has a counter variable, it is implicitly referenced and
* assigned to. Note that since the LHS of an assignment is counted as a
* reference, we actually have to increment referenced_count by 2 so that
* later code will know that the variable isn't just assigned to.
*/
if (ir->counter != NULL) {
ir_variable_refcount_entry *entry =
this->get_variable_entry(ir->counter);
if (entry) {
entry->referenced_count += 2;
entry->assigned_count++;
}
}
return visit_continue;
}