[Bug rtl-optimization/38774] [4.4 Regression] ice in df_refs_verify, at df-scan.c:4307

[jakub at gcc dot gnu dot org]

------- Comment #5 from jakub at gcc dot gnu dot org  2009-01-13 20:39 -------
The single CC user is modified, then those changes are reverted, but
unfortunately they aren't reverted by putting back the old content, but instead
tweaking the new comparison with PUT_CODE.
          SUBST (*cc_use, gen_rtx_fmt_ee (new_code, GET_MODE (*cc_use),
                                          dest, const0_rtx));   
          other_changed = 1;
...
              if ((recog_for_combine (&pat, other_insn, &note) < 0
                   && ! check_asm_operands (pat)))
                {
                  PUT_CODE (*cc_use, old_code);
                  other_changed = 0;

We should insert put there the old *cc_use rtx.  I'll test a patch.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38774