change io specification (see README)
delete some comment outed code
Add XOR and Define uint and sint clearly.
Merge branch 'developer' of github-hrontan:hrontan/CoreWe3 into developer
implement xor
Merge branch 'developer' of github.com:hrontan/CoreWe3 into developer
xor ->lxor
-.x -> fneg x
Fix Simulator
resolve conflict
Merge branch 'io_feature' into developer