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Re: PowerPC optimization regression
- From: David Edelsohn <dje dot gcc at gmail dot com>
- To: Joakim Tjernlund <joakim dot tjernlund at transmode dot se>, Michael Meissner <meissner at linux dot vnet dot ibm dot com>, Peter Bergner <bergner at vnet dot ibm dot com>
- Cc: gcc at gcc dot gnu dot org
- Date: Wed, 8 Dec 2010 11:38:11 -0500
- Subject: Re: PowerPC optimization regression
- References: <OF67F6DEBE.2B8D710C-ONC12577F3.0034256B-C12577F3.0034D8EA@transmode.se>
On Wed, Dec 8, 2010 at 4:37 AM, Joakim Tjernlund
<joakim.tjernlund@transmode.se> wrote:
>
> I have noticed gcc 4.4.5 often produces less optimzed code
> than the old 3.4.6. Below is the latest example. I am
> starting to wonder if I need rebuild gcc 4.4.5 and/or
> add new options to gcc when I compile. Any insight?
Jocke,
As Ian mentioned, please open a performance regression bug report on
GCC Bugzilla and add me, Mike Meissner and Peter Bergner to the CC
list.
This might be a lingering result of the GCC SSA transition and not a
PowerPC-specific regression, although the symptom has more impact on
PowerPC.
Thanks, David