glsl2: Track the number of ir_loop_jump instructions that are in a loop

src/glsl/loop_analysis.cpp

@@ -103,6 +103,7 @@ class loop_analysis : public ir_hierarchical_visitor {
 public:
    loop_analysis();
 
+   virtual ir_visitor_status visit(ir_loop_jump *);
    virtual ir_visitor_status visit(ir_dereference_variable *);
 
    virtual ir_visitor_status visit_enter(ir_loop *);
@@ -131,6 +132,22 @@ loop_analysis::loop_analysis()
 }
 
 
+ir_visitor_status
+loop_analysis::visit(ir_loop_jump *ir)
+{
+   (void) ir;
+
+   assert(!this->state.is_empty());
+
+   loop_variable_state *const ls =
+      (loop_variable_state *) this->state.get_head();
+
+   ls->num_loop_jumps++;
+
+   return visit_continue;
+}
+
+
 ir_visitor_status
 loop_analysis::visit(ir_dereference_variable *ir)
 {

src/glsl/loop_analysis.h

@@ -104,8 +104,14 @@ public:
     */
    hash_table *var_hash;
 
+   /**
+    * Number of ir_loop_jump instructions that operate on this loop
+    */
+   unsigned num_loop_jumps;
+
    loop_variable_state()
    {
+      this->num_loop_jumps = 0;
       this->var_hash = hash_table_ctor(0, hash_table_pointer_hash,
 				       hash_table_pointer_compare);
    }

src/glsl/loop_controls.cpp

@@ -253,6 +253,10 @@ loop_control_visitor::visit_leave(ir_loop *ir)
 		   * satisfied.
 		   */
 		  if_stmt->remove();
+
+		  assert(ls->num_loop_jumps > 0);
+		  ls->num_loop_jumps--;
+
 		  this->progress = true;
 	       }