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-rw-r--r--src/glsl/opt_dead_builtin_variables.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/glsl/opt_dead_builtin_variables.cpp b/src/glsl/opt_dead_builtin_variables.cpp
index 85c75d6f21f..0d4e3a8f00a 100644
--- a/src/glsl/opt_dead_builtin_variables.cpp
+++ b/src/glsl/opt_dead_builtin_variables.cpp
@@ -52,7 +52,7 @@ optimize_dead_builtin_variables(exec_list *instructions,
&& var->data.how_declared != ir_var_declared_implicitly)
continue;
- if (strncmp(var->name, "gl_", 3) != 0)
+ if (!is_gl_identifier(var->name))
continue;
/* gl_ModelViewProjectionMatrix and gl_Vertex are special because they