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Old computers didn't even detect the overflow, so in the old time there
was no overhead.
Really? What computer was that? Even in the z80 (think TRS-80) (and I
think on the 4004, two generations before the 8080) there was a Carry Flag.
And of course, the 360 that preceded it (and probably most other computers
before that) also detected carry or overflow or whatever you want to call
it.
But the point is moot. This is bad practice. As far as I know, the
practice was (thankfully) contained to the IBM Midrange computers (excluding
AIX), and has always been a performance issue.
Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
You can't have everything. Where would you put it?
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