[Bug tree-optimization/45860] New: [4.6 Regression] ICE: verify_ssa failed: virtual SSA name for non-VOP decl at -O1

[Bug tree-optimization/45860] New: [4.6 Regression] ICE: verify_ssa failed: virtual SSA name for non-VOP decl at -O1

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45860

           Summary: [4.6 Regression] ICE: verify_ssa failed: virtual SSA
                    name for non-VOP decl at -O1
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 21937
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=21937
reduced testcase

Might be related to PR45732

Compiler output:
$ gcc -O pr45860.c 
pr45860.c: In function 'foo':
pr45860.c:2:1: error: virtual SSA name for non-VOP decl
while verifying SSA_NAME cstore.1_7 in statement
# .MEM_13 = VDEF <.MEM_10>
    cstore.1_7 = MEM[(char * {ref-all})D.2686_4];
pr45860.c:2:1: error: virtual SSA name for non-VOP decl
while verifying SSA_NAME cstore.1_8 in statement
cstore.1_8 = PHI <cstore.1_7(3), ""(2)>
pr45860.c:2:1: error: virtual SSA name for non-VOP decl
pr45860.c:2:1: error: missing definition
for SSA_NAME: cstore.1_7 in statement:
cstore.1_8 = PHI <cstore.1_7(3), ""(2)>
PHI argument
cstore.1_7
for PHI node
cstore.1_8 = PHI <cstore.1_7(3), ""(2)>
pr45860.c:2:1: internal compiler error: verify_ssa failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r164716 - crash
r163636 - OK

[Bug tree-optimization/45860] [4.6 Regression] ICE: verify_ssa failed: virtual SSA name for non-VOP decl at -O1

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45860

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.10.02 01:45:14
                 CC|                            |hubicka at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2010-10-02 01:45:14 UTC ---
It is caused by revision 164688:

http://gcc.gnu.org/ml/gcc-cvs/2010-09/msg00987.html

[Bug tree-optimization/45860] [4.6 Regression] ICE: verify_ssa failed: virtual SSA name for non-VOP decl at -O1

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45860

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.6.0

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-03 19:51:59 UTC ---
The conditional store pass is confused about

  *D.1952_4 = 0;
  D.1953_5 = i_1(D) & 1;
  if (D.1953_5 != 0)
    goto <bb 3>;
  else
    goto <bb 4>;

<bb 3>:
  MEM[(char * {ref-all})D.1952_4] = "";

because that assignment is an array-to-array assignment (not exactly
optimal result of constant-folding).

[Bug tree-optimization/45860] [4.6 Regression] ICE: verify_ssa failed: virtual SSA name for non-VOP decl at -O1

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45860

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
                 CC|                            |jakub at gcc dot gnu.org

[Bug tree-optimization/45860] [4.6 Regression] ICE: verify_ssa failed: virtual SSA name for non-VOP decl at -O1

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45860

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-20 09:57:41 UTC ---
I have a patch.

[Bug tree-optimization/45860] [4.6 Regression] ICE: verify_ssa failed: virtual SSA name for non-VOP decl at -O1

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45860

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-20 11:09:57 UTC ---
Author: rguenth
Date: Wed Oct 20 11:09:54 2010
New Revision: 165718

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=165718
Log:
2010-10-20  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/45860
    * tree-ssa-phiopt.c (cond_store_replacement): Do not do
    conditional store replacement for non-register type stores.

    * gcc.dg/torture/pr45860.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr45860.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-phiopt.c

[Bug tree-optimization/45860] [4.6 Regression] ICE: verify_ssa failed: virtual SSA name for non-VOP decl at -O1

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45860

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> 2010-10-20 12:11:17 UTC ---
Fixed.