Module: Mesa
Branch: master
Commit: 3f349d4e18d8c114a34fc3c36e1dc55345c1cc31
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=3f349d4e18d8c114a34fc3c36e1dc55345c1cc31
Author: Eric Anholt <e...@anholt.net>
Date: Fri Mar 16 15:44:25 2012 -0700
glsl: If an "if" has no "then" or "else" code left, remove it.
Cuts 8/1068 instructions from glyphy's fragment shaders on i965.
Reviewed-by: Kenneth Graunke <kenn...@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.roman...@intel.com>
---
src/glsl/opt_if_simplification.cpp | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
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
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