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-rw-r--r--src/glsl/opt_flip_matrices.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/glsl/opt_flip_matrices.cpp b/src/glsl/opt_flip_matrices.cpp
index 497513fe82e..2107b1d4740 100644
--- a/src/glsl/opt_flip_matrices.cpp
+++ b/src/glsl/opt_flip_matrices.cpp
@@ -81,8 +81,10 @@ matrix_flipper::visit_enter(ir_expression *ir)
if (mvp_transpose &&
strcmp(mat_var->name, "gl_ModelViewProjectionMatrix") == 0) {
+#ifndef NDEBUG
ir_dereference_variable *deref = ir->operands[0]->as_dereference_variable();
assert(deref && deref->var == mat_var);
+#endif
void *mem_ctx = ralloc_parent(ir);