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

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>

1 files changed, 0 insertions, 21 deletions

diff --git a/src/glsl/ir_variable_refcount.cpp b/src/glsl/ir_variable_refcount.cpp
index 425ed81..923eb1a 100644
--- a/src/glsl/ir_variable_refcount.cpp
+++ b/src/glsl/ir_variable_refcount.cpp
@@ -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;
-}