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-rw-r--r--src/glsl/ir_tree_grafting.cpp4
1 files changed, 4 insertions, 0 deletions
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 ||