patch: emit tail calls with zeroext/signext on return

[Tim Northover]

On 30 July 2013 22:38, Stephen Lin <swlin at post.harvard.edu> wrote:
> Tim Northover is doing some work in possibly overhauling the TCO
> detection logic to fix some bugs and also allows tail calls in some
> cases we don't handle right now. From the looks of it, I think you
> patch might actually be disjoint, to be honest, but I'm cc'ing him to
> make sure this gets his attention, just in case.

It is orthogonal to my patch (though might cause a purely textual
conflict for one of us). I had a look yesterday, but before I could
get around to wrangling the actual logic of the patch Richard replied.

Cheers.

Tim.