https://bugs.freedesktop.org/show_bug.cgi?id=95130
--- Comment #4 from Nicolai Hähnle nhaehnle@gmail.com --- As a temporary workaround, the error should disappear when you run with the environment variable setting R600_DEBUG=mono.
The cause is that with non-monolithic shaders, input interpolation happens in the prolog. However, when we compile the prolog we do not see the derivative computations and therefore fail to turn the helper pixels on.