Re: Rotate Left from C

"Lieven Marchand" <mal@wyrd.be>
20 Oct 2002 22:49:31 -0400

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From: "Lieven Marchand" <mal@wyrd.be>
Newsgroups: comp.compilers
Date: 20 Oct 2002 22:49:31 -0400
Organization: Only under extreme pressure
References: 02-10-065
Keywords: architecture
Posted-Date: 20 Oct 2002 22:49:31 EDT

"David Sexton" <da5id65536@yahoo.com> writes:


> [How many machines still have rotate instructions? I thought they had
> gone out of fashion. Yes, I know the Pentium does, but its instruction
> set dates from the 1970s. -John]


The PowerPc has them too. Since a lot of encryption algorithms use
integer rotations heavily, they might make a come back. The absence of
rotate instructions in e.g. the Sparc showed up strongly in the
relative efficiency of clients for Sparc and Powerpc of the
distributed.net rc5 challenge.

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