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If we don't do that and the source is not 32-bit we end up with a bit_size mismatch when doing the ior operation. Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29333>