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Re: PATCH: tune ARM's rtx_costs function
- From: James Lemke <jim at wasabisystems dot com>
- To: Richard dot Earnshaw at arm dot com
- Cc: Ian Lance Taylor <ian at wasabisystems dot com>,Ben Elliston <bje at wasabisystems dot com>, gcc-patches at gcc dot gnu dot org
- Date: 08 Oct 2003 12:15:56 -0400
- Subject: Re: PATCH: tune ARM's rtx_costs function
- Organization:
- References: <200310080828.h988Sls07634@pc960.cambridge.arm.com>
> But unless you are forcing the compilation levels, that's going to use -O2
> everywhere, which isn't interesting, since we always did use a new pseudo
> at O2. It's compilation times at O0 and O1 that are interesting.
For "time make CXXFLAGS_FOR_TARGET=-O1 all-target-libstdc++-v3" I get
the following times.
User time is slightly longer 251.75 vs 252.59 which is +0.33%.
Noise level?
Reference time with preserve_subexpressions_p ()..
real 6m9.795s
user 4m11.750s
sys 1m48.330s
Time without preserve_subexpressions_p ()..
real 6m2.698s
user 4m12.590s
sys 1m46.170s
--
James Lemke jim@wasabisystems.com Orillia, Ontario
http://www.wasabisystems.com