[Bug bootstrap/41345] bootstrap comparison failure with --disable-checking

["cadaker at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #4 from cadaker at gmail dot com  2009-10-25 20:14 -------
This is still present in -r153539, along with some more comparison failures
(gcc/tree-vrp.o, gcc/tree-complex.o, gcc/sese.o, gcc/sel-sched.o, gcc/bitmap.o,
gcc/lto/lto-lang.o, gcc/cp/class.o).

Could this be of any help? This is a heavily reduced case of one failure in
bitmap.o. It fails with 'gcc -c -O2 -fcompare-debug' (but not with -O1) for me
on x86_64:

unsigned
bitmap_first_set_bit (unsigned long* bits)
{
  unsigned bit_no = 0;
  unsigned ix = 0;

  for (ix = 0; ix != 1u; ix++)
      if (bits[ix])
        goto found_bit;
  __builtin_unreachable();
 found_bit:

 return bit_no;
}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41345