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Re: [Bug rtl-optimization/8361] [3.4/4.0/4.1 regression] C++compile-time performance regression
- From: Daniel Berlin <dberlin at dberlin dot org>
- To: gcc-bugzilla at gcc dot gnu dot org
- Cc: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 13 Oct 2005 00:07:24 -0400
- Subject: Re: [Bug rtl-optimization/8361] [3.4/4.0/4.1 regression] C++compile-time performance regression
- References: <bug-8361-231@http.gcc.gnu.org/bugzilla/> <20051013033449.3336.qmail@sourceware.org>
On Thu, 2005-10-13 at 03:34 +0000, pinskia at gcc dot gnu dot org wrote:
>
> ------- Comment #57 from pinskia at gcc dot gnu dot org 2005-10-13 03:34 -------
> A semi recent 4.1 (the 10th) gives:
> tree PTA : 1.60 ( 6%) usr 0.02 ( 1%) sys 1.73 ( 6%) wall
> 10338 kB ( 1%) ggc
> tree alias analysis : 1.32 ( 5%) usr 0.19 (10%) sys 1.48 ( 5%) wall
> 18910 kB ( 3%) ggc
>
> while 4.0 gave:
> tree PTA : 0.50 ( 2%) usr 0.00 ( 0%) sys 0.48 ( 2%) wall
> tree alias analysis : 0.73 ( 3%) usr 0.00 ( 0%) sys 0.76 ( 3%) wall
>
> So this is definitely a 4.1 regression.
>
>
I'm pretty sure we run PTA more times in 4.1 than 4.0
Maybe i'm wrong.
Can you oprofile this and give me some kind of hotspot to look into in
PTA?