[Bug rtl-optimization/49941] [4.7 Regression] segmentation fault in redirect_jump_2

[amodra at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49941

--- Comment #5 from Alan Modra <amodra at gmail dot com> 2011-08-03 01:29:54 UTC ---
Bernd, that looks very similar to the patch I started to write.  Then I saw the
comment in mark_jump_label_1
        /* Do not change a previous setting of JUMP_LABEL.  If the
           JUMP_LABEL slot is occupied by a different label,
           create a note for this label.  */

So I'm a little concerned that plugging in ret_rtx like that is safe.  Hmm, I
suppose it is if you know for sure that any jump that returns doesn't reference
other labels.  Is that the case?

I have a patch that handles the JUMP_LABEL replacement in rs6000.md