[Bug rtl-optimization/32557] [4.3 Regression] internal compiler error: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:956

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

------- Comment #2 from ebotcazou at gcc dot gnu dot org  2007-07-15 15:43 -------
> I get something similiar with my 16-bit x86 port compiling libgcc:

Same on SPARC/Solaris:
  http://gcc.gnu.org/ml/gcc-patches/2007-06/msg02135.html

> This patch seems to fix it:
> 
> Index: gcc/df-problems.c
> ===================================================================
> --- gcc/df-problems.c   (revision 126653)
> +++ gcc/df-problems.c   (working copy)
> @@ -4023,8 +4023,9 @@ df_note_bb_compute (unsigned int bb_inde
>        while (*mws_rec)
>         {
>           struct df_mw_hardreg *mws = *mws_rec; 
> +         rtx reg = REG_P (mws->mw_reg) ? mws->mw_reg : SUBREG_REG
> (mws->mw_reg);
>           if ((mws->type != DF_REF_REG_DEF)  
> -             && !df_ignore_stack_reg (REGNO (mws->mw_reg)))
> +             && !df_ignore_stack_reg (REGNO (reg)))
>             old_dead_notes
>               = df_set_dead_notes_for_mw (insn, old_dead_notes, 
>                                           mws, live, do_not_gen,

See the discussion at
  http://gcc.gnu.org/ml/gcc-patches/2007-06/msg01894.html


-- 

ebotcazou at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2007-07-15 15:43:00
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32557