[Bug target/39076] internal compiler error when cross-compiling flac

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

------- Comment #6 from ramana dot r at gmail dot com  2009-02-04 08:34 -------
(In reply to comment #5)
> (In reply to comment #4)
> 
> > Looking at the dumps this rtx is generated by the rename registers pass in
> > 4.3.x . In trunk however rename register does not generate this rtx and hence
> > there is no problem. It could still be latent but one has to dig deeper. 
> 
> A quick comparison of trunk and gcc 4.3 branch shows the following patch being
> applied in trunk vs. the 4.3 branch. 
> 
> http://gcc.gnu.org/ml/gcc-patches/2008-04/msg01577.html
> 
> A quick check with the patch at 
> 
> ramana@numenor:~/cos/mycos/gcc/gcc$ svn diff -r137128:137235 regrename.c 
> Index: regrename.c
> ===================================================================
> --- regrename.c (revision 137128)
> +++ regrename.c (revision 137235)
> @@ -812,7 +812,7 @@
>                     OP_IN, 0);
> 
>           for (i = 0; i < recog_data.n_dups; i++)
> -           *recog_data.dup_loc[i] = copy_rtx (old_dups[i]);
> +           *recog_data.dup_loc[i] = old_dups[i];
>           for (i = 0; i < n_ops; i++)
>             *recog_data.operand_loc[i] = old_operands[i];
>           if (recog_data.n_dups)
> 

Related discussions and patch proposed here. 

http://gcc.gnu.org/ml/gcc/2009-02/msg00074.html

This is essentially a backport of a patch in trunk - A full bootstrap and
regression test is underway. I've confirmed that this patch fixes the ICE
mentioned with the ARM port.




-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39076