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Re: -floop-flatten and PR 52307
- From: Richard Guenther <richard dot guenther at gmail dot com>
- To: Thomas Koenig <tkoenig at netcologne dot de>
- Cc: gcc at gcc dot gnu dot org, "fortran at gcc dot gnu dot org" <fortran at gcc dot gnu dot org>
- Date: Sun, 26 Feb 2012 16:22:04 +0100
- Subject: Re: -floop-flatten and PR 52307
- References: <4F4A266E.5010908@netcologne.de>
On Sun, Feb 26, 2012 at 1:32 PM, Thomas Koenig <tkoenig@netcologne.de> wrote:
> Hello world,
>
> -floop-flatten breaks Lapack, which uses quite a common technique; see
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52307
>
> This is not a regression as far as I can determine, but the bug is
> severe enough that I would consider removing the option for the 4.7
> release.
>
> Opinions?
Why remove it? Just document it is experimental. It's not turned on by
default at any optimization level - and it even lacks a cost model, so is
not really useful.
Richard.
> ? ? ? ?Thomas