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Re: [tree-ssa] Block merging (updated)
> >If there really is some reason why not to remove them, we should also
> >fix other places that cause it (jump threading, OTOH, perhaps some
> Certainly. Can you point out specifics where they are being deleted?
> "jump threading" is not specific enough -- we have an RTL version as
> well as a tree version. A testcase would also be helpful.
the tree one -- when you thread over a block containing the user label,
it may become unreachable and it is then removed. On the other hand,
having user labels prevent jump threading seems sort of stupid.