[Bug tree-optimization/39007] New: -ftree-loop-distribution ICEs

[kazu at gcc dot gnu dot org]

Consider:

void
foo (int *__restrict__ p, int *__restrict__ q, int count)
{
  while (--count >= 0)
    {
      *p++ = 0;
      *q++ = 0;
    }
}

I get:

$ ./cc1 -quiet -O2 -ftree-loop-distribution min.c
min.c: In function 'foo':
min.c:2: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

This is as of Revision 143741, which is after the fix for PR
tree-optimization/38997 has gone in:

http://gcc.gnu.org/ml/gcc-cvs/2009-01/msg00752.html

FWIW, if I try:

void
foo (int *__restrict__ p, int *__restrict__ q, int count)
{
  int i;
  for (i = 0; i < count; i++)
    {
      *p++ = 0;
      *q++ = 0;
    }
}

I get:

*** glibc detected *** ./cc1: malloc(): memory corruption: 0xf7efd160 ***

I am guessing that depending on the exact memory allocation pattern,
different parts of memory get corrupted.


-- 
           Summary: -ftree-loop-distribution ICEs
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kazu at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39007