From: geoff@plan9.bell-labs.com
To: 9fans@9fans.net
Subject: Re: [9fans] Integer arithmetic: some lessons
Date: Wed, 21 Apr 2010 11:03:06 -0400 [thread overview]
Message-ID: <dc0579fcc1179638e3a224ecc4c094a5@plan9.bell-labs.com> (raw)
In-Reply-To: <20100421134019.GA1382@polynum.com>
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.
next prev parent reply other threads:[~2010-04-21 15:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-21 13:40 tlaronde
2010-04-21 15:03 ` geoff [this message]
2010-04-21 20:19 ` tlaronde
2010-04-21 23:28 ` Bakul Shah
2010-04-22 5:51 ` tlaronde
2010-04-22 9:42 ` Steve Simon
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