[Bug target/44031] [4.4/4.5 Regression] ice in subst_reloads, at reload.c:6327

[Bug target/44031] [4.4/4.5 Regression] ice in subst_reloads, at reload.c:6327

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot
                   |                            |gnu.org
      Known to work|                            |4.6.0
   Target Milestone|4.6.0                       |4.4.6
            Summary|[4.4/4.5/4.6 Regression]    |[4.4/4.5 Regression] ice in
                   |ice in subst_reloads, at    |subst_reloads, at
                   |reload.c:6327               |reload.c:6327
      Known to fail|                            |4.5.3

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-01-26 18:13:17 UTC ---
Works on the mainline, still fails on the 4.5 branch.

[Bug target/44031] [4.4/4.5 Regression] ice in subst_reloads, at reload.c:6327

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031

--- Comment #8 from Jeffrey A. Law <law at redhat dot com> 2011-01-26 22:11:55 UTC ---
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On 01/26/11 11:14, ebotcazou at gcc dot gnu.org wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031
> 
> Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>                  CC|                            |ebotcazou at gcc dot
>                    |                            |gnu.org
>       Known to work|                            |4.6.0
>    Target Milestone|4.6.0                       |4.4.6
>             Summary|[4.4/4.5/4.6 Regression]    |[4.4/4.5 Regression] ice in
>                    |ice in subst_reloads, at    |subst_reloads, at
>                    |reload.c:6327               |reload.c:6327
>       Known to fail|                            |4.5.3
> 
> --- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-01-26 18:13:17 UTC ---
> Works on the mainline, still fails on the 4.5 branch.
FWIW, I have no idea which change might have fixed it on the trunk; more
likely than not it was by accident rather than by design.  As such I
doubt there's a particular patch that could be pulled from the trunk and
applied to the 4.5 branch to resolve this issue.

jeff

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[Bug target/44031] [4.4/4.5 Regression] ice in subst_reloads, at reload.c:6327

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031

Mikael Pettersson <mikpe at it dot uu.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mikpe at it dot uu.se

--- Comment #9 from Mikael Pettersson <mikpe at it dot uu.se> 2011-01-28 15:02:42 UTC ---
This test case stopped failing on 4.6 with r162726:

Author: bernds
Date: Fri Jul 30 23:50:00 2010
New Revision: 162726

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162726
Log:
    * rtlanal.c (simplify_subreg_regno): Don't treat
    HARD_FRAME_POINTER_REGNUM specially.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/rtlanal.c

See also http://gcc.gnu.org/ml/gcc-patches/2010-07/msg00756.html

[Bug target/44031] [4.4/4.5 Regression] ice in subst_reloads, at reload.c:6327

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031

--- Comment #10 from Mikael Pettersson <mikpe at it dot uu.se> 2011-01-28 18:28:11 UTC ---
Backporting r162726 to 4.5.2 and 4.4.5 prevents the ICE there too.

[Bug target/44031] [4.4/4.5 Regression] ice in subst_reloads, at reload.c:6327

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #11 from Jeffrey A. Law <law at redhat dot com> 2011-01-28 18:42:34 UTC ---
The patch Mikael references removes some bogus code which prevents
simplification of a subreg of the frame pointer which was causing some problems
for the ARM.  This case (x86) shows the same failing behaviour, we have a
subreg of the frame pointer which triggers a reload we're ultimately unable to
handle.

I'm going to go ahead and mark this as resolved since I believe Bernd nailed it
which is reinforced by Mikael's comments that backporting that fix to the 4.5
and 4.4 branches fixes the problem on the branches as well.

[Bug target/44031] [4.4/4.5 Regression] ice in subst_reloads, at reload.c:6327

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031

--- Comment #12 from Jeffrey A. Law <law at redhat dot com> 2011-01-28 18:43:27 UTC ---
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On 01/28/11 11:28, mikpe at it dot uu.se wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031
> 
> --- Comment #10 from Mikael Pettersson <mikpe at it dot uu.se> 2011-01-28 18:28:11 UTC ---
> Backporting r162726 to 4.5.2 and 4.4.5 prevents the ICE there too.
Thanks for verifiying this.  That, in my mind seals the deal.


jeff
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[Bug rtl-optimization/44031] [4.4/4.5 Regression] ice in subst_reloads, at reload.c:6327

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031

--- Comment #13 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-01-31 10:45:23 UTC ---
Author: ebotcazou
Date: Mon Jan 31 10:45:20 2011
New Revision: 169433

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=169433
Log:
    PR rtl-optimization/44031
    * gcc.c-torture/compile/20110131-1.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/20110131-1.c
Modified:
    trunk/gcc/testsuite/ChangeLog

[Bug rtl-optimization/44031] [4.4/4.5 Regression] ice in subst_reloads, at reload.c:6327

[dnovillo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031

--- Comment #14 from Diego Novillo <dnovillo at gcc dot gnu.org> 2011-02-02 18:09:15 UTC ---
Author: dnovillo
Date: Wed Feb  2 18:09:04 2011
New Revision: 169713

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=169713
Log:
    PR rtl-optimization/44031
    * gcc.c-torture/compile/20110131-1.c: New test.

Added:
   
branches/google/integration/gcc/testsuite/gcc.c-torture/compile/20110131-1.c
Modified:
    branches/google/integration/gcc/testsuite/ChangeLog