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...of coroutine semantics: > > This is certainly one way of implementing exceptions.  > Unfortunately, it would be prohibitively expensive to create > a new coroutine every time a new EH scope is entered — > much worse than other explicit scope-tracking > implementations like SEH or builtin_sj/lj. I completely agree on this, but it seems to me that all the exception specific context switchs are no more than a list of specific optimization scenarios where one can trim certain aspects of the context switch. It seems to me that the idea of language-specific exceptions is a too high level...

On Apr 13, 2011, at 21:43 CDT, John McCall wrote: > And it's okay to have limited goals! I personally don't; I think we > should aim to get the IR design good enough to support crazy resumptive > languages with crazy custom unwinding schemes. But I need to know what > range of problems we're willing to consider solving before I can usefully > weigh different

On May 4, 2011, at 8:23 AM, Evan Cheng wrote: >> I don't know how realistic it is to model the loop buffer in the register allocator, but this would a very interesting thing to try to optimize for in a later pass. If an inner loop "almost" fits, then it would probably be worth heroic effort to try to reduce the size of it to shave off a few bytes. > > Jakob and I have