[Bug tree-optimization/69068] New: [6 Regression] ICE in bb_contains_loop_phi_nodes, at graphite-isl-ast-to-gimple.c:1279

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69068

            Bug ID: 69068
           Summary: [6 Regression] ICE in bb_contains_loop_phi_nodes, at
                    graphite-isl-ast-to-gimple.c:1279
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

At least gcc-6.0.0-alpha20151220 and gcc-6.0.0-alpha20151227 ICE when compiling
the following reduced snippet w/ -O1 -floop-nest-optimize:

int qo;
int zh[2];

void
td(void)
{
  int ly, en;
  for (ly = 0; ly < 2; ++ly)
    for (en = 0; en < 2; ++en)
      zh[en] = ((qo == 0) || (((qo * 2) != 0))) ? 1 : -1;
}

% gcc-6.0.0-alpha20151227 -O1 -floop-nest-optimize -c kj3xpeme.c 
kj3xpeme.c: In function 'td':
kj3xpeme.c:5:1: internal compiler error: in bb_contains_loop_phi_nodes, at
graphite-isl-ast-to-gimple.c:1279
 td(void)
 ^~