[Bug tree-optimization/54098] New: [tree-vrp] ICE on valid code

[Bug tree-optimization/54098] New: [tree-vrp] ICE on valid code

[zhroma at newmail dot ru]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54098

             Bug #: 54098
           Summary: [tree-vrp] ICE on valid code
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zhroma@newmail.ru


Created attachment 27876
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27876
Preprocessed minimized testcase.

gcc 4.8 revision 188728 and later segfaults on 64bit Linux while compiling the
attached code with -march=nocona.

$ gcc -Wall -O2 -march=nocona -c foo-small.c
foo-small.c: In function 'pbus_size_mem':
foo-small.c:35:6: internal compiler error: Segmentation fault
 void pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long
type, unsigned long long min_size, unsigned long long add_size, void
*realloc_head) {
      ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

$ gcc --version
gcc (GCC) 4.8.0 20120618 (experimental)
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

gcc configured with "--disable-bootstrap --enable-languages=c,c++"
4.6.3 works ok. 4.8 trunk up to revision 188727 also works ok.

[Bug tree-optimization/54098] [4.8 Regression] ICE on valid code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54098

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2012-07-26
   Target Milestone|---                         |4.8.0
            Summary|[tree-vrp] ICE on valid     |[4.8 Regression] ICE on
                   |code                        |valid code
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-26 09:00:10 UTC ---
Confirmed, mine.

Program received signal SIGSEGV, Segmentation fault.
0x0000000000e03ca0 in compare_values_warnv (val1=0x0, val2=0x7ffff70bef00, 
    strict_overflow_p=0x7fffffffd83b "")
    at /space/rguenther/src/svn/trunk/gcc/tree-vrp.c:1148
1148      gcc_assert (POINTER_TYPE_P (TREE_TYPE (val1))
(gdb) p val1
$1 = (tree) 0x0

lhs_vr is undefined in vrp_visit_phi_node at

7671      if (edges > 0
7672          && gimple_phi_num_args (phi) > 1
7673          && edges == old_edges)
7674        {
7675          int cmp_min = compare_values (lhs_vr->min, vr_result.min);
7676          int cmp_max = compare_values (lhs_vr->max, vr_result.max);

[Bug tree-optimization/54098] [4.8 Regression] ICE on valid code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54098

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-26 10:25:21 UTC ---
Author: rguenth
Date: Thu Jul 26 10:25:15 2012
New Revision: 189885

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189885
Log:
2012-07-26  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/54098
    * tree-vrp.c (vrp_visit_phi_node): Iterate once more if the
    original range was UNDEFINED.

    * gcc.dg/torture/pr54098.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr54098.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vrp.c

[Bug tree-optimization/54098] [4.8 Regression] ICE on valid code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54098

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

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

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-26 11:30:19 UTC ---
Fixed.