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Re: Big find_cross_jump performance regression.
- To: Brad Lucier <lucier at math dot purdue dot edu>
- Subject: Re: Big find_cross_jump performance regression.
- From: Michael Matz <matzmich at cs dot tu-berlin dot de>
- Date: Mon, 22 May 2000 17:40:54 +0200 (MET DST)
- cc: gcc at gcc dot gnu dot org, feeley at iro dot umontreal dot ca
Hi,
On Sun, 21 May 2000, Brad Lucier wrote:
> There has been a tremendous performance regression in find_cross_jump
> from gcc version 2.96 20000511 to gcc version 2.96 20000519. With
> this file:
>
> With 2.96 20000519 (+ Michael Matz's dominator calculation code,
> which I'm testing and which seems to have nothing to do with the problem),
> I get
>
> Execution times (seconds)
> jump :1866.16 (99%) usr 0.24 (52%) sys1865.85 (99%) wall
Wow! ;)
I couldn't reproduce it with current CVS (1.128 of jump.c) from may 22.
With your new_t-c-2.i I get the same results as with older versions. So
either your build was confused, or it doesn't like alpha at all ;)
Ciao,
Michael.