> It seems like -frename-registers is generally
> broken, or triggers generally broken code.

What about the attached patch?  Would it be ok to commit as obvious?  

Sorry for the breakage.

Paolo

2004-04-19  Paolo Bonzini  <bonzini@gnu.org>

        Revert part of 2004-04-17 change to 
        * toplev.c (flag_rename_registers): Initialize to 0.
        * doc/invoke.texi (Optimize options): Move -frename-registers
        to "Not triggered by any -O level" section.  Adjust commentary
        accordingly.