https://bugs.freedesktop.org/show_bug.cgi?id=64257

--- Comment #68 from Alex Deucher <agd5f@yahoo.com> ---
Trig functions need slightly different setup on r6xx and r7xx+.  See
tgsi_setup_trig() in r600_shader.c:

/*
 * r600 - trunc to -PI..PI range
 * r700 - normalize by dividing by 2PI
 * see fdo bug 27901
 */

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