[Bug tree-optimization/58451] New: ICE with segfault at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes)

["su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58451

            Bug ID: 58451
           Summary: ICE with segfault at -O3 on x86_64-linux-gnu (both
                    32-bit and 64-bit modes)
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The following code causes an ICE when compiled with the current gcc trunk at
-O3 on x86_64-linux in both 32-bit and 64-bit modes. 

This is a regression from 4.8.x. 


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure
--enable-languages=c,c++,objc,obj-c++,fortran,lto
--with-gmp=/usr/local/gcc-trunk --with-mpfr=/usr/local/gcc-trunk
--with-mpc=/usr/local/gcc-trunk --with-cloog=/usr/local/gcc-trunk
--prefix=/usr/local/gcc-trunk
Thread model: posix
gcc version 4.9.0 20130917 (experimental) [trunk revision 202643] (GCC) 
$ gcc-trunk -O2 -c small.c
$ gcc-4.8 -O3 -c small.c
$ gcc-trunk -O3 -c small.c
small.c: In function âfooâ:
small.c:3:6: internal compiler error: Segmentation fault
 void foo ()
      ^
0x9249bf crash_signal
        ../../gcc-trunk/gcc/toplev.c:335
0xa2719d find_uses_to_rename_use
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.c:369
0xa273d6 find_uses_to_rename_bb
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.c:427
0xa27b6d find_uses_to_rename
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.c:451
0xa27b6d rewrite_into_loop_closed_ssa(bitmap_head_def*, unsigned int)
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.c:513
0x995070 tree_loop_distribution
        ../../gcc-trunk/gcc/tree-loop-distribution.c:1738
0x995070 execute
        ../../gcc-trunk/gcc/tree-loop-distribution.c:1781
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$ 



-------------------------------------------


int *a[2], b, c, d, e;

void foo ()
{
  for (b = 1; b >= 0; b--)
    if (e)
      {
        a[b] = 0;
        c = d = 0;
      }
}