[Mesa-dev] [PATCH] glsl: If an "if" has no "then" or "else" code left, remove it.

[Eric Anholt]

Cuts 8/1068 instructions from glyphy's fragment shaders on i965.
---
 src/glsl/opt_if_simplification.cpp |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/glsl/opt_if_simplification.cpp b/src/glsl/opt_if_simplification.cpp
index 940dd08..7e88208 100644
--- a/src/glsl/opt_if_simplification.cpp
+++ b/src/glsl/opt_if_simplification.cpp
@@ -66,6 +66,14 @@ do_if_simplification(exec_list *instructions)
 ir_visitor_status
 ir_if_simplification_visitor::visit_leave(ir_if *ir)
 {
+   /* If the if statement has nothing on either side, remove it. */
+   if (ir->then_instructions.is_empty() &&
+       ir->else_instructions.is_empty()) {
+      ir->remove();
+      this->made_progress = true;
+      return visit_continue;
+   }
+
    /* FINISHME: Ideally there would be a way to note that the condition results
     * FINISHME: in a constant before processing both of the other subtrees.
     * FINISHME: This can probably be done with some flags, but it would take
-- 
1.7.9.5