On Fri, Mar 24, 2017 at 10:43 AM, Grant Edwards
<grant.b.edwa...@gmail.com> wrote:

> I predict it will get worse and worse until it gets forked and
> somebody else fixes it.
I thought someone suggested that the interrupt routine saves too many
registers because it ends up calling a runtime function because one of
the variables has a wrong type (or rather, type that is not optimal
for this case).

Bob, did you check whether changing the declared type avoids calling
the runtime, and avoids excessive register saving/restoring?

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