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From: "rakdver at atrey dot karlin dot mff dot cuni dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/17428] [4.0 Regression] internal compiler error: in spill_failure, at reload1.c:1880
Date: Thu, 28 Oct 2004 13:19:00 -0000 [thread overview]
Message-ID: <20041028131904.23661.qmail@sourceware.org> (raw)
In-Reply-To: <20040912034129.17428.opticcow@linux-militia.net>
------- Additional Comments From rakdver at atrey dot karlin dot mff dot cuni dot cz 2004-10-28 13:18 -------
Subject: Re: [4.0 Regression] internal compiler error: in spill_failure, at reload1.c:1880
Hello,
> Because of the patch http://gcc.gnu.org/ml/gcc-cvs/2004-10/msg01513.html
> that adds "-funroll-loops" to "-fprofile-generate" the testcase from
> comment #4 has to be compiled with
> "-msse -O2 -fspeculative-prefetching -fprofile-generate -fno-unroll-loops"
> to still trigger the bug. Alternatively one can increase the number of
> iterations of the loop from 2 to 20.
>
> The bug finally disappeared with Zdenek's patch
> http://gcc.gnu.org/ml/gcc-cvs/2004-10/msg01561.html
> which seems to address Andrew's suggestion from comment #5.
>
> Zdenek, is this a real fix or is this just papering over the problem?
no, that patch cannot fix the problem; so it is just masked, and ...
> I.e. is your patch from comment #9 still needed or not?
... this patch is still needed.
Zdenek
>
> Alas, the original testcase still segfaults with mainline. Here's a testcase:
>
> ==============================================================
> int foo(int, int) __attribute__((pure));
>
> void bar()
> {
> int i;
>
> if (foo(0,0))
> for (i = 0; i < 2; i++)
> ;
> }
> ==============================================================
>
> Compile with "-O -march=pentium4 -fprofile-generate -fspeculative-prefetching
> -funroll-loops"
> to trigger the bug.
>
> Phils's regression tester about this bug:
> : Search converges between 2004-10-01-014001-trunk (#570) and
> 2004-10-01-161002-trunk (#571).
>
>
> --
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17428
>
> ------- You are receiving this mail because: -------
> You are on the CC list for the bug, or are watching someone who is.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17428
next prev parent reply other threads:[~2004-10-28 13:19 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-12 3:41 [Bug c/17428] New: " opticcow at linux-militia dot net
2004-09-12 3:45 ` [Bug c/17428] " opticcow at linux-militia dot net
2004-09-12 3:54 ` pinskia at gcc dot gnu dot org
2004-09-12 3:54 ` pinskia at gcc dot gnu dot org
2004-09-12 3:56 ` [Bug rtl-optimization/17428] [4.0 Regression] " pinskia at gcc dot gnu dot org
2004-09-14 2:13 ` [Bug target/17428] " reichelt at gcc dot gnu dot org
2004-09-14 2:32 ` pinskia at gcc dot gnu dot org
2004-09-14 21:09 ` rakdver at atrey dot karlin dot mff dot cuni dot cz
2004-09-21 11:49 ` rakdver at gcc dot gnu dot org
2004-09-21 12:59 ` [Bug rtl-optimization/17428] " pinskia at gcc dot gnu dot org
2004-09-21 20:38 ` rakdver at gcc dot gnu dot org
2004-09-25 23:32 ` opticcow at linux-militia dot net
2004-10-16 13:29 ` reichelt at gcc dot gnu dot org
2004-10-28 9:28 ` reichelt at gcc dot gnu dot org
2004-10-28 11:42 ` reichelt at gcc dot gnu dot org
2004-10-28 13:19 ` rakdver at atrey dot karlin dot mff dot cuni dot cz [this message]
2004-11-04 7:06 ` rakdver at gcc dot gnu dot org
2004-11-27 0:25 ` [Bug rtl-optimization/17428] internal compiler error: in spill_failure, at reload1.c:1880 (-fspeculative-prefetching) pinskia at gcc dot gnu dot org
2005-02-14 16:03 ` cvs-commit at gcc dot gnu dot org
2005-02-15 20:53 ` reichelt at gcc dot gnu dot org
2005-04-11 9:47 ` reichelt at gcc dot gnu dot org
2005-04-11 10:33 ` reichelt at gcc dot gnu dot org
2005-04-11 10:41 ` rakdver at atrey dot karlin dot mff dot cuni dot cz
2005-06-02 16:08 ` reichelt at gcc dot gnu dot org
2005-07-29 9:41 ` reichelt at gcc dot gnu dot org
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