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David Barker authored
When cdef-singlepass is enabled, it is possible to signal the CDEF parameters in such a way that we end up with unsigned integer overflow in constrain(). Fix this by i) using signed instead of unsigned values, and ii) clamping the result to avoid going on to shift by a negative amount. Change-Id: Ib677b2d644e44000c54959f7280e646bf02054da
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