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It is an sint_4, but it was stored in a uint_8... The code using it was acting as if it was signed. Problem found thanks to Coverity Cc: "10.4" <mesa-stable@lists.freedesktop.org> Tested-by: David Heidelberg <david@ixit.cz> Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu> Signed-off-by: Axel Davy <axel.davy@ens.fr>
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