This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug fortran/34683] Fortran FE generated IL pessimizes middle-end IL and analysis
- From: "rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 6 Jan 2008 22:12:11 -0000
- Subject: [Bug fortran/34683] Fortran FE generated IL pessimizes middle-end IL and analysis
- References: <bug-34683-14773@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #17 from rguenther at suse dot de 2008-01-06 22:12 -------
Subject: Re: Fortran FE generated IL pessimizes middle-end
IL and analysis
On Sun, 6 Jan 2008, jaydub66 at gmail dot com wrote:
> ------- Comment #16 from jaydub66 at gmail dot com 2008-01-06 22:08 -------
> I've done some experimenting with older GCC versions I have floating around on
> my machines:
>
> Compiling the test case with both 4.1.2 and 4.2.1 gives an ICE, so I guess we
> can't exactly call this a regression.
>
> But then compiling with older 4.3 trunk builds works much better:
> I have a version from August 24 of last year, which runs the test case at full
> -O3 in a perfect 8sec, with 32MB memory usage (that is with
> --enable-checking=release). And I have two other builds from October 8 and
> November 9, which both run the test case in about 38s with 85MB mem-usage (they
> are built with --enable-checking=debug, so this is probably just debugging
> overhead). At least none of them takes the crazy 800MB of recent builds.
>
> To sum up: It seems like trunk versions up to at least November 9 seem to work
> fine on this test case.
Well, we know what introduced this regression on the trunk. It was
the fix for PR33870.
Richard.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34683