> Tristan : background question : what raises the overflow?

Most of the arithmetic operators in mcode checks for overflow, using
either the carry flag or the overflow flag.  Usually the generated insn
is into or int 5 (IIRC).

> Is it an
> explicit raise in the JIT mode?
 
Yes.

>(if so, is there scope to raise an alternative exception?)

I'd prefer not to!

Tristan.

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