[Bug tree-optimization/38529] New: [4.3/4.4 regression] ICE with nested loops

[reichelt at gcc dot gnu dot org]

The following valid code snippet triggers an ICE since GCC 4.3.0 when
compiled with "-O3 -march=pentium4" or "-O -ftree-vectorize -march=pentium4":

==================================
float a[4];

void foo()
{
  int i, j;

  for (i = 0; i < 4; ++i)
    for (j = 0; j < 17; ++j)
      a[i] = 0;
}
==================================

bug.c: In function 'foo':
bug.c:3: internal compiler error: in vect_get_vec_def_for_operand, at
tree-vect-transform.c:2000
Please submit a full bug report, [etc.]


-- 
           Summary: [4.3/4.4 regression] ICE with nested loops
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code, monitored
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38529