I find it extremely silly to implement it as edge anyway. The EE line
is
level triggered, and having a mix of edge and level on the same
exception without a clean way to retrigger the DEC one other than
waiting one tick is just causing trouble.
It isn't edge triggered, it just automatically clears the
decrementer exception condition at its source when taken
(on certain implementations -- others leave it to software
to clear it).
Segher
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