[Bug tree-optimization/59388] New: ICE on valid code at -O1 and above on x86_64-linux-gnu

[Bug tree-optimization/59388] New: ICE on valid code at -O1 and above on x86_64-linux-gnu

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

            Bug ID: 59388
           Summary: ICE on valid code at -O1 and above on x86_64-linux-gnu
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The following code causes an ICE when compiled with the current gcc trunk at
-O1 and above on x86_64-linux-gnu in both 32-bit and 64-bit modes.

It is a regression from 4.8.x. 


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 4.9.0 20131204 (experimental) [trunk revision 205673] (GCC) 
$ 
$ gcc-trunk -O0 small.c; a.out
$ gcc-4.8 -O1 small.c; a.out
$ 
$ gcc-trunk -O1 small.c
small.c: In function ‘main’:
small.c:9:1: error: definition in block 2 follows the use
 main () 
 ^
for SSA_NAME: _2 in statement:
_8 = _2;
small.c:9:1: internal compiler error: verify_ssa failed
0xb56fcc verify_ssa(bool)
    ../../gcc-trunk/gcc/tree-ssa.c:1096
0x8fa8be execute_function_todo
    ../../gcc-trunk/gcc/passes.c:1844
0x8fb2b3 execute_todo
    ../../gcc-trunk/gcc/passes.c:1877
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$ 


------------------------


int a;

struct
{
  unsigned int f:1;
} b;

int 
main () 
{ 
  a = (0 < b.f) | b.f; 
  return a; 
}
>From gcc-bugs-return-436663-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Dec 04 19:00:19 2013
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/59388] [4.9 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu
Date: Wed, 04 Dec 2013 19:00:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY388

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-12-04
                 CC|                            |mpolacek at gcc dot gnu.org
      Known to work|                            |4.8.2
   Target Milestone|---                         |4.9.0
            Summary|ICE on valid code at -O1    |[4.9 Regression] ICE on
                   |and above on                |valid code at -O1 and above
                   |x86_64-linux-gnu            |on x86_64-linux-gnu
     Ever confirmed|0                           |1
      Known to fail|                            |4.9.0

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed, -fno-tree-reassoc makes the ICE go away.

[Bug tree-optimization/59388] [4.9 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1

[Bug tree-optimization/59388] [4.7/4.8/4.9 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|4.8.2                       |
            Summary|[4.9 Regression] ICE on     |[4.7/4.8/4.9 Regression]
                   |valid code at -O1 and above |ICE on valid code at -O1
                   |on x86_64-linux-gnu         |and above on
                   |                            |x86_64-linux-gnu
      Known to fail|                            |4.8.2

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This really is 4.7+ regression, you just need --enable-checking=yes compiler on
the branches to reproduce (otherwise it is a silent wrong-code ? ).
I'll have a look soon.

[Bug tree-optimization/59388] [4.7/4.8/4.9 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 31392
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31392&action=edit
gcc49-pr59388.patch

Untested 4.9 fix.

[Bug tree-optimization/59388] [4.7/4.8/4.9 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 31393
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31393&action=edit
gcc48-pr59388.patch

Untested 4.8.x patch.

[Bug tree-optimization/59388] [4.7/4.8/4.9 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Dec  6 21:00:49 2013
New Revision: 205761

URL: http://gcc.gnu.org/viewcvs?rev=205761&root=gcc&view=rev
Log:
    PR tree-optimization/59388
    * tree-ssa-reassoc.c (update_range_test): If op == range->exp,
    gimplify tem after stmt rather than before it.

    * gcc.c-torture/execute/pr59388.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr59388.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-reassoc.c

[Bug tree-optimization/59388] [4.7/4.8/4.9 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Dec  6 21:06:13 2013
New Revision: 205762

URL: http://gcc.gnu.org/viewcvs?rev=205762&root=gcc&view=rev
Log:
    PR tree-optimization/59388
    * tree-ssa-reassoc.c (update_range_test): If op == range->exp,
    gimplify tem after stmt rather than before it.

    * gcc.c-torture/execute/pr59388.c: New test.

Added:
    branches/gcc-4_8-branch/gcc/testsuite/gcc.c-torture/execute/pr59388.c
Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_8-branch/gcc/tree-ssa-reassoc.c

[Bug tree-optimization/59388] [4.7 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.8.3, 4.9.0
            Summary|[4.7/4.8/4.9 Regression]    |[4.7 Regression] ICE on
                   |ICE on valid code at -O1    |valid code at -O1 and above
                   |and above on                |on x86_64-linux-gnu
                   |x86_64-linux-gnu            |
      Known to fail|4.9.0                       |

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 4.8.3+ so far.

[Bug tree-optimization/59388] [4.7 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu

[trippels at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |trippels at gcc dot gnu.org
   Target Milestone|4.9.0                       |4.7.4

[Bug tree-optimization/59388] [4.7 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-checking, wrong-code
           Priority|P1                          |P2
      Known to fail|                            |4.7.3

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Not sure why this was P1, dropping to P2.

[Bug tree-optimization/59388] [4.7 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59388

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|4.7.4                       |4.8.3
      Known to fail|                            |4.7.4

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed for 4.8.3.