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PER_QUAD TMU lookups will partially override the predication mask on TMU writes. If some but not all lanes in a quad are predicated out, setting PER_QUAD will force them all to be enabled. This can result in TMU access to bogus addresses when in nonuniform control flow. Also, since PER_QUAD is needed to make sure derivatives work with helper invocations, and derivatives are undefined in nonuniform control flow, there is no reason to leave it enabled in this case. Reviewed-by: Iago Toral Quiroga <itoral@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7726>