Mesa (glsl2): glsl2: Fix the linked version of ir_dead_code.

[Eric Anholt]

Module: Mesa
Branch: glsl2
Commit: 5532c4ca696fea32fb9b2f8de15beabe4a20ae15
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=5532c4ca696fea32fb9b2f8de15beabe4a20ae15

Author: Eric Anholt <eric at anholt.net>
Date:   Tue Jul 27 11:29:17 2010 -0700

glsl2: Fix the linked version of ir_dead_code.

If we don't walk into functions, we won't see any usage of variables
in the functions.

---

 src/glsl/ir_dead_code.cpp |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/glsl/ir_dead_code.cpp b/src/glsl/ir_dead_code.cpp
index 4804407..eab459b 100644
--- a/src/glsl/ir_dead_code.cpp
+++ b/src/glsl/ir_dead_code.cpp
@@ -61,7 +61,7 @@ public:
    virtual ir_visitor_status visit(ir_variable *);
    virtual ir_visitor_status visit(ir_dereference_variable *);
 
-   virtual ir_visitor_status visit_enter(ir_function *);
+   virtual ir_visitor_status visit_enter(ir_function_signature *);
    virtual ir_visitor_status visit_leave(ir_assignment *);
 
    variable_entry *get_variable_entry(ir_variable *var);
@@ -116,9 +116,12 @@ ir_dead_code_visitor::visit(ir_dereference_variable *ir)
 
 
 ir_visitor_status
-ir_dead_code_visitor::visit_enter(ir_function *ir)
+ir_dead_code_visitor::visit_enter(ir_function_signature *ir)
 {
-   (void) ir;
+   /* We don't want to descend into the function parameters and
+    * dead-code eliminate them, so just accept the body here.
+    */
+   visit_list_elements(this, &ir->body);
    return visit_continue_with_parent;
 }