[Bug rtl-optimization/58068] New: ICE in execute_strength_reduction at -O3 (both 32-bit and 64-bit modes)

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58068

            Bug ID: 58068
           Summary: ICE in execute_strength_reduction at -O3 (both 32-bit
                    and 64-bit modes)
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-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 (both 32-bit and 64-bit modes). This is a regression from
4.8.x.

$ gcc-trunk -v
gcc version 4.9.0 20130801 (experimental) [trunk revision 201397] (GCC) 
$ gcc-trunk -O2 -c reduced.c
$ gcc-trunk -O3 -c reduced.c
reduced.c: In function ‘foo’:
reduced.c:4:6: internal compiler error: Segmentation fault
 void foo ()
      ^
0x7d52ef crash_signal
    ../../gcc-trunk/gcc/toplev.c:334
0x5d8ddb dominated_by_p(cdi_direction, basic_block_def const*, basic_block_def
const*)
    ../../gcc-trunk/gcc/dominance.c:974
0xb3f0c6 phi_add_costs
    ../../gcc-trunk/gcc/gimple-ssa-strength-reduction.c:2192
0xb4125d replace_uncond_cands_and_profitable_phis
    ../../gcc-trunk/gcc/gimple-ssa-strength-reduction.c:2242
0xb426d3 analyze_candidates_and_replace
    ../../gcc-trunk/gcc/gimple-ssa-strength-reduction.c:3371
0xb426d3 execute_strength_reduction
    ../../gcc-trunk/gcc/gimple-ssa-strength-reduction.c:3458
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.
$ gcc-4.8 -O3 -c reduced.c
$ 



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


int a, c;
unsigned int b;

void foo ()
{
  for (; b < 2; b++)
    if (++c * -1 > 0)
      for (;; a++)
    ;
}