https://bugs.freedesktop.org/show_bug.cgi?id=91247

--- Comment #8 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
OK, I did the bisect. It was commit

commit b04ef3c08a288a5857349c9e582ee2718fa562f7
Author: Kenneth Graunke <kenneth-xkhwgxqQjnbNLxjTenLetw@public.gmane.org>
Date:   Fri May 30 23:52:22 2014 -0700

    glsl: Immediately inline built-ins rather than generating calls.

that fixed it. That means that this was some kind of nv50/ir compiler bug which
has gotten hidden away. Urgh :(

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