[Sorry for the delay on following up on this]

> The rtlanal.c parts are ok.  I wonder if we ever hit the _or_truncate
> case with vector modes in force_to_mode though - can you check if
> using gen_lowpart instead of gen_lowpart_or_truncate works?

I checked this and gen_lowpart instead of gen_lowpart_or_truncate
appears fine.

Attached is patch modified to use gen_lowpart, and with the test case
cleaned up & changeloged.

Cheers,
Ralph.


> 
> Btw, you missa ChangeLog entry for the testcase for
> testsuite/ChangeLog.
> 
> Thanks,
> Richard.
> 
> > 2008-10-19  Ralph Loader  <suckfish@ihug.co.nz>
> >
> >        PR middle-end/37807, middle-end/37809
> >        * combine.c (force_to_mode): Do not process vector types.
> >
> >        * rtlanal.c (nonzero_bits1): Do not process vector types.
> >        (num_sign_bit_copies1): Likewise.
> >
> > Cheers,
> > Ralph.
> >