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Re: [PATCH] PR/7344, O(n^2) branch prediction
- From: Brad Lucier <lucier at math dot purdue dot edu>
- To: tm at mail dot kloo dot net (tm)
- Cc: rakdver at atrey dot karlin dot mff dot cuni dot cz (Zdenek Dvorak), dberlin at dberlin dot org (Daniel Berlin), lucier at math dot purdue dot edu (Brad Lucier), jh at suse dot cz, gcc-patches at gcc dot gnu dot org
- Date: Sat, 7 Sep 2002 17:08:22 -0500 (EST)
- Subject: Re: [PATCH] PR/7344, O(n^2) branch prediction
Did you test this new patch to see if it reduced the long runtimes
you reported for branch prediction? I ran it on the test-case in
http://gcc.gnu.org/ml/gcc/2002-08/msg01559.html
and discovered no difference in run times.
Brad
> I think you're right. Here is the revised patch.
>
> 2002-09-06 Toshiyasu Morita <toshiyasu.morita@hsa.hitachi.com>
>
> * predict.c (process_note_prediction): Ignore multiway
> branches to avoid excessively long compile times (PR/7344)