[Bug tree-optimization/51245] [4.7 Regression] ICE in vn_reference_insert_pieces, at tree-ssa-sccvn.c:1983

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51245

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-11-25
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |4.7.0
            Summary|ICE in                      |[4.7 Regression] ICE in
                   |vn_reference_insert_pieces, |vn_reference_insert_pieces,
                   |at tree-ssa-sccvn.c:1983    |at tree-ssa-sccvn.c:1983
     Ever Confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-11-25 08:30:15 UTC ---
Shorter testcase for -O2/-O3:

struct S { int s; } a, *b, **c;
int d;

struct S
foo (void)
{
  struct S s = { 0 }, *e = &a;
  if (d)
    **c = *b;
  while (1)
    {
      *b = s;
      *e = *b;
      if (a.s)
    break;
    }
  return **c;
}

Caused by http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=179556 aka
PR38885.