[Bug c/46216] New: ice: SSA corruption

[Bug c/46216] New: ice: SSA corruption

[dcb314 at hotmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46216

           Summary: ice: SSA corruption
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dcb314@hotmail.com


Created attachment 22195
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22195
C source code

I just tried to compile package embryo-0.9.9.49898 with the latest 4.6
snapshot 20101023 on a Fedora Linux box. The compiler said

Unable to coalesce ssa_names 16 and 188 which are marked as MUST COALESCE.
cip_16(ab) and  cip_188(ab)
embryo_amx.c: In function 'embryo_program_run':
embryo_amx.c:1048:1: internal compiler error: SSA corruption
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Source code attached. Flag -O2 required.

[Bug tree-optimization/46216] [4.6 Regression] ICE: SSA corruption

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46216

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.10.28 21:31:02
                 CC|                            |rguenth at gcc dot gnu.org
   Target Milestone|---                         |4.6.0
            Summary|ice: SSA corruption         |[4.6 Regression] ICE: SSA
                   |                            |corruption
     Ever Confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2010-10-28 21:31:02 UTC ---
It is caused by revision 161655:

http://gcc.gnu.org/ml/gcc-cvs/2010-07/msg00006.html

[Bug tree-optimization/46216] [4.6 Regression] ICE: SSA corruption

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46216

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |rguenth at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-29 12:59:55 UTC ---
Mine.

[Bug tree-optimization/46216] [4.6 Regression] ICE: SSA corruption

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46216

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-02 15:11:16 UTC ---
Reduced testcase:

typedef int Embryo_Cell;
int 
embryo_program_run(Embryo_Cell *cip)
{
    unsigned char op;
    Embryo_Cell offs;
    static const void *switchtable[256] = { 
        &&SWITCHTABLE_EMBRYO_OP_NONE, &&SWITCHTABLE_EMBRYO_OP_LOAD_PRI 
    };
    for (;;)
      {
        op = *cip++;
        while (1) {
            goto *switchtable[op];
SWITCHTABLE_EMBRYO_OP_LOAD_PRI:
            offs = *(Embryo_Cell *)cip++;
SWITCHTABLE_EMBRYO_OP_NONE:
            break;
        };
      }
    return offs;
}

[Bug tree-optimization/46216] [4.6 Regression] ICE: SSA corruption

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46216

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-02 16:58:47 UTC ---
Author: rguenth
Date: Tue Nov  2 16:58:40 2010
New Revision: 166203

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=166203
Log:
2010-11-02  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/46216
    * tree-ssa-forwprop.c (tree_ssa_forward_propagate_single_use_vars):
    Check if we can propagate from a POINTER_PLUS_EXPR before doing so.

    * gcc.dg/torture/pr46216.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr46216.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-forwprop.c

[Bug tree-optimization/46216] [4.6 Regression] ICE: SSA corruption

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46216

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

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

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-03 09:58:38 UTC ---
Fixed.