[Bug rtl-optimization/17482] GCSE after reload replacing changing instructions

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

------- Additional Comments From dje at gcc dot gnu dot org  2004-09-14 21:01 -------
oprs_unchanged_p() used to test reg_avail_info[] for last_bb versus current_bb,
and then first_set/last_set versus CUID.  Now it only tests the presence of
reg_avail_info[], which now is cleared for each BB.

    case REG:
      {
        struct reg_avail_info *info = &reg_avail_info[REGNO (x)];

        if (info->last_bb != current_bb)
          return 1;
        if (avail_p)
          return info->last_set < INSN_CUID (insn);
        else
          return info->first_set >= INSN_CUID (insn);
      }


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17482