glsl2: Add a pass for removing unused functions.

For a shader involving many small functions, this avoids running
optimization across all of them after they've been inlined
post-linking.

Reduces the runtime of linking and running a fragment shader from Yo
Frankie from 1.6 seconds to 0.9 seconds (-44.9%, +/- 3.3%).

1 files changed, 6 insertions, 0 deletions

diff --git a/src/glsl/glsl_symbol_table.h b/src/glsl/glsl_symbol_table.h
index 27e825597c..02e4542cf3 100644
--- a/src/glsl/glsl_symbol_table.h
+++ b/src/glsl/glsl_symbol_table.h
@@ -133,6 +133,12 @@ public:
       return _mesa_symbol_table_add_symbol(table, glsl_function_name_space,
 					   name, f) == 0;
    }
+
+   bool remove_function(const char *name, ir_function *f)
+   {
+      return _mesa_symbol_table_add_symbol(table, glsl_function_name_space,
+					   name, f) == 0;
+   }
    /*@}*/
 
    /**