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Re: Timing information for CFG manipulations
- To: Brad Lucier <lucier at math dot purdue dot edu>
- Subject: Re: Timing information for CFG manipulations
- From: Dan Nicolaescu <dann at godzilla dot ICS dot UCI dot EDU>
- Date: Wed, 17 Oct 2001 14:12:19 -0700
- Cc: jh at suse dot cz, gcc-patches at gcc dot gnu dot org
Something is fishy with your results for 3.1 -O1
[snip]
> Here are 3.1 times without the profiling code and with the patch
>
> http://gcc.gnu.org/ml/gcc-patches/2001-10/msg00792.html
>
> dino01% /u/lucier/local/gcc-3.1/lib/gcc-lib/i686-pc-linux-gnu/3.1/cc1 -fpic -fomit-frame-pointer -O1 -fno-math-errno -fno-strict-aliasing -mcpu=athlon -march=athlon _num.i
>
> [snip]
> Execution times (seconds)
> garbage collection : 0.67 ( 0%) usr 0.00 ( 0%) sys 0.72 ( 0%) wall
> cfg construction : 6.37 ( 4%) usr 0.26 ( 6%) sys 6.66 ( 4%) wall
> cfg cleanup : 33.59 (21%) usr 0.01 ( 0%) sys 33.69 (20%) wall
> preprocessing : 0.17 ( 0%) usr 0.11 ( 2%) sys 0.44 ( 0%) wall
> lexical analysis : 0.29 ( 0%) usr 0.22 ( 5%) sys 0.53 ( 0%) wall
> parser : 1.19 ( 1%) usr 0.15 ( 3%) sys 1.28 ( 1%) wall
> varconst : 0.07 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall
> jump : 0.63 ( 0%) usr 0.00 ( 0%) sys 0.66 ( 0%) wall
> CSE : 0.72 ( 0%) usr 0.00 ( 0%) sys 0.69 ( 0%) wall
> global CSE : 32.87 (21%) usr 0.57 (13%) sys 33.53 (20%) wall
^^^^^^^^^^^^^^^^^^^^^^
gcse is not enabled when using -O1 !