by Brian J. Holla » Fri, 03 Jan 1997 04:00:00
Does anyone know of a way to optimize a long long multiplication on a
UltraSPARC-II? If not, is there a way to detect an overflow when
multiplying two integers.
Thanks.
--
Brian Holland
The MITRE Corporation MS E095
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617.271.3789
by Casper H.S. D » Fri, 03 Jan 1997 04:00:00
Run 2.5.1.; you'll find that there's a __mul64 defined inQuote:>Does anyone know of a way to optimize a long long multiplication on a
>UltraSPARC-II? If not, is there a way to detect an overflow when
>multiplying two integers.
(Note that this requires that you use Sun's C compiler as
gcc includes it's own, non UltraSPARC enhanced, 64 bit
integer ops)
Casper
--
Casper Dik - Sun Microsystems - via my guest account at the University
Statements on Sun products included here are not gospel and may
be fiction rather than truth.
1. long long & long double types in Linux GCC
There are two non-standard types defined in Linux GCC: long long (8 bytes)
and "long double" (12 bytes, but I think it uses 10 bytes floating point
type supported by 80x87 coprocessor). Both seem to work internally OK,
but is there a way to "printf" such values. Man page for "printf" does mention a
format modifier "L" for long double values, but it is not working. Nothing
about "long long" can be found in manpage.
Any experience with these types?
regards, Michal.
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