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Re: [patch] for PR 18687
- From: David Edelsohn <dje at watson dot ibm dot com>
- To: Zdenek Dvorak <dvorakz at suse dot cz>, Richard Henderson <rth at redhat dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Fri, 11 Feb 2005 10:05:10 -0500
- Subject: Re: [patch] for PR 18687
- References: <20050208164124.GA27095@atrey.karlin.mff.cuni.cz>
This patch has a good effect if -funroll-loops also is enabled,
but a very bad effect without. For instance, on our tests, swim loses
nearly 20% performance with the patch when using options
-O2 -mcpu=power4
versus
-O2 -mcpu=power4 -funroll-lops -fpeel-loops
David