[Bug rtl-optimization/64713] Missed ccmp optimization

["pinskia at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64713

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
It is failing this check:
  /* Make sure that the value that is to be substituted for the register
     does not use any registers whose values alter in between.  However,
     If the insns are adjacent, a use can't cross a set even though we
     think it might (this can happen for a sequence of insns each setting
     the same destination; last_set of that register might point to
     a NOTE).  If INSN has a REG_EQUIV note, the register is always
     equivalent to the memory so the substitution is valid even if there
     are intervening stores.  Also, don't move a volatile asm or
     UNSPEC_VOLATILE across any other insns.  */
  || (!all_adjacent
      && (((!MEM_P (src) || !find_reg_note (insn, REG_EQUIV, src))
       && use_crosses_set_p (src, DF_INSN_LUID (insn)))
          || (GET_CODE (src) == ASM_OPERANDS && MEM_VOLATILE_P (src))
          || GET_CODE (src) == UNSPEC_VOLATILE))