From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <dc0579fcc1179638e3a224ecc4c094a5@plan9.bell-labs.com>
Date: Wed, 21 Apr 2010 11:03:06 -0400
From: geoff@plan9.bell-labs.com
To: 9fans@9fans.net
In-Reply-To: <20100421134019.GA1382@polynum.com>
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Subject: Re: [9fans] Integer arithmetic: some lessons
Topicbox-Message-UUID: 0b815530-ead6-11e9-9d60-3106f5b1d025

If you think that shift operators aren't being translated
to shift instructions, you can examine the output of 8c -S.

x/2 is equal to x>>1 for non-negative integer x; for negative x,
the two expressions may yield different values, even if
x is a signed integer.  The book Hacker's Delight, among others,
explores these sorts of optimisations.