From e71b4ab8a64bf978b2036976a41e30996eebb0c8 Mon Sep 17 00:00:00 2001 From: Paul Berry Date: Fri, 1 Jul 2011 15:33:36 -0700 Subject: [PATCH] glsl: In lower_jumps.cpp, lower both branches of a conditional. Previously, lower_jumps.cpp would break out of its loop after lowering a jump instruction in just the then- or else-branch of a conditional, and it would fail to lower a jump instruction occurring in the other branch. Without this patch, lower_jumps.cpp may require multiple passes in order to lower all jumps. This results in sub-optimal output because lower_jumps.cpp produces a brand new set of temporary variables each time it is run, and the redundant temporary variables are not guaranteed to be eliminated by later optimization passes. Fixes unit test test_lower_returns_4. --- src/glsl/lower_jumps.cpp | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/glsl/lower_jumps.cpp b/src/glsl/lower_jumps.cpp index 199a0184fee..07897825b49 100644 --- a/src/glsl/lower_jumps.cpp +++ b/src/glsl/lower_jumps.cpp @@ -638,7 +638,10 @@ lower_continue: block_records[lower].min_strength = strength_always_clears_execute_flag; block_records[lower].may_clear_execute_flag = true; this->progress = true; - break; + + /* Let the loop run again, in case the other branch of the + * if needs to be lowered too. + */ } }