i tried your patch to tcpdump (around apr 25 - sorry that i made you
wait for a long time). it looks to me that the signedness changes
are correct, however, in some cases your change will make libpcap
optimize less. for example, we could have optimized "1 > 1" to
"ret #0" alone.
itojun
itojun[starfruit:~/work/tcpdump/tcpdump] SU ./tcpdump -n -i lo0 -d '1 > 1'
tcpdump: WARNING: BIOCPROMISC: Invalid argument
(000) ld #0x1
(001) ldx #0x1
(002) jgt x jt 3 jf 4 <-- always false
(003) ret #96
(004) ret #0
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