Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!sm.unisys.com!hplabs!hp-sdd!ncr-sd!ncrlnk!uunet!portal!cup.portal.com!Chuck_M_Grandgent
From: Chuck_M_Grandgent@cup.portal.com
Newsgroups: comp.lang.c
Subject: double longs
Message-ID: <14295@cup.portal.com>
Date: 4 Feb 89 16:24:56 GMT
Organization: The Portal System (TM)
Lines: 16

I'm look for leads on "C" source for doing simple arithmetic 
efficiently with "double longs" - that is, I need twice the
integer precision of a long, and for Intel chip architecture
to boot (not a bad idea - 'to boot' Intel arch.).
Reals just don't hack it for what I need to do.
"dlong" add and subtract are pretty trivial, you could maintain
two longs and do the carry/borrow yourself, but multiply and
divide appear more difficult to do efficiently.
If had "dlongs" could get nice precision (by doing appropriate
scaling) without attendant complications of floating point
packages.
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sun!portal!cup.portal.com!chuck_m_grandgent     K1OM
AEG Modicon Industrial Automation Systems Group
North Andover, Mass.
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