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From: gwyn@brl-smoke.ARPA (Doug Gwyn )
Newsgroups: comp.lang.c
Subject: Re: 16x16 = 32
Message-ID: <6577@brl-smoke.ARPA>
Date: Mon, 19-Oct-87 08:22:06 EDT
Article-I.D.: brl-smok.6577
Posted: Mon Oct 19 08:22:06 1987
Date-Received: Tue, 20-Oct-87 02:06:15 EDT
References: <143@kesmai.COM> <31167@sun.uucp>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 8

In article <31167@sun.uucp> guy%gorodish@Sun.COM (Guy Harris) writes:
>In a C implementation with 16-bit "int"s, any
>multiplication of two "int"s must, if it yields a result at all (which it may
>not, if overflows are checked for), MUST yield a 16-bit result.

Although this is true for most operations on (unsigned), operations
on (int) that overflow are in the implementation-dependent category
and may even keep additional high-order bits, as I understand it.