From: Eric Anholt <eric@anholt.net>
Date: Thu, 5 Aug 2010 19:24:36 +0000 (-0700)
Subject: glsl2: Don't tree-grafting out assignment to an out variable.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b259eb28049fc06ebc75a7714834b9ed037a3454;p=mesa.git

glsl2: Don't tree-grafting out assignment to an out variable.

Fixes:
glsl-deadcode-varying.
---

diff --git a/src/glsl/ir_tree_grafting.cpp b/src/glsl/ir_tree_grafting.cpp
index 38034a61977..1a742f412cb 100644
--- a/src/glsl/ir_tree_grafting.cpp
+++ b/src/glsl/ir_tree_grafting.cpp
@@ -319,6 +319,10 @@ tree_grafting_basic_block(ir_instruction *bb_first,
       if (!lhs_var)
 	 continue;
 
+      if (lhs_var->mode == ir_var_out ||
+	  lhs_var->mode == ir_var_inout)
+	 continue;
+
       struct variable_entry *entry = info->refs->get_variable_entry(lhs_var);
 
       if (!entry->declaration ||