>> also, in the kernel bpf_filter.c code, A and X registers are unsigned
>> but mem[] are signed.
>yes.
>but it can be changed to unsigned safely, i think.
>because all usage of mem[] seems to involve implicit
>conversion to or from unsigned.
>(i don't know about other implementations than NetBSD, though)
i've pulled in your corrections regarding to subtract operation
optimization into the repository. TNX!
(still not sure about signed/unsigned-ness during computation)
itojun
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