glsl2: Add some easy-to-enable debug printfs to ir_dead_code.cpp.

diff --git a/src/glsl/ir_dead_code.cpp b/src/glsl/ir_dead_code.cpp
index bf032f1dc21011c5193dca774ca7249677dc537e..a8d264f39a992fde7dfa966865440f6bbb8e9635 100644 (file)
--- a/src/glsl/ir_dead_code.cpp
+++ b/src/glsl/ir_dead_code.cpp
@@ -32,6 +32,8 @@
 #include "ir_variable_refcount.h"
 #include "glsl_types.h"
 
+static bool debug = false;
+
 /**
  * Do a dead code pass over instructions and everything that instructions
  * references.
@@ -60,6 +62,13 @@ do_dead_code(exec_list *instructions)
        */
       assert(entry->referenced_count >= entry->assigned_count);
 
+      if (debug) {
+        printf("%s@%p: %d refs, %d assigns, %sdeclared in our scope\n",
+               entry->var->name, entry->var,
+               entry->referenced_count, entry->assigned_count,
+               entry->declaration ? "" : "not ");
+      }
+
       if ((entry->referenced_count > entry->assigned_count)
          || !entry->declaration)
         continue;
@@ -72,6 +81,11 @@ do_dead_code(exec_list *instructions)
             entry->var->mode != ir_var_inout) {
            entry->assign->remove();
            progress = true;
+
+           if (debug) {
+              printf("Removed assignment to %s@%p\n",
+                     entry->var->name, entry->var);
+           }
         }
       } else {
         /* If there are no assignments or references to the variable left,
@@ -79,6 +93,11 @@ do_dead_code(exec_list *instructions)
          */
         entry->var->remove();
         progress = true;
+
+        if (debug) {
+           printf("Removed declaration of %s@%p\n",
+                  entry->var->name, entry->var);
+        }
       }
    }
    talloc_free(v.mem_ctx);