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[Bug middle-end/17886] variable rotate and long long rotate should be better optimized
- From: "ak at muc dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Oct 2005 20:39:40 -0000
- Subject: [Bug middle-end/17886] variable rotate and long long rotate should be better optimized
- References: <bug-17886-7834@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #20 from ak at muc dot de 2005-10-04 20:39 -------
Newer linux does that of course, although not always in older releases.
But even in user space it's not a good idea to use SSE2 unless you really need
it because it increases the cost of the context switch and costs an exception
each time first in a timeslice.
P.S.: I was the original poster, but the application wasn't a kernel but I
doubt
it's a good idea to use SSE2.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17886