[Bug rtl-optimization/8361] [3.4/4.0/4.1 regression] C++ compile-time performance regression

[Daniel Berlin]

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?