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Re: Minor reload cleanup/speedup
- From: Paolo Carlini <pcarlini at suse dot de>
- To: Jan Hubicka <jh at suse dot cz>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Wed, 04 Feb 2004 16:20:55 +0100
- Subject: Re: Minor reload cleanup/speedup
- References: <20040204145630.GE21148@kam.mff.cuni.cz>
Jan Hubicka wrote:
Hi,
just simple replacements of switch instructions that are really ifs.
Cause about 30% speedup of the loop, but it is quite small difference in
overall scores even tought it is one of the most hot loops around.
Hi Honza, interesting tweak!
Can we say something general? I mean, for instance: let's suppose that
all the branches are equally probable, in that case, the generated code
is *always* faster for a switch?
This kind of knowledge could greatly help in performance tuning the
library.
Thanks!
Paolo.