Continue strict-volatile-bitfields fixes

[Jakub Jelinek]

On Thu, May 24, 2012 at 02:29:18PM +0200, Thomas Schwinge wrote:
> Hi!
> 
> Ping.

Ok.

> > > 	* fold-const.c (optimize_bit_field_compare): Abort early in the strict
> > > 	volatile bitfields case.
> > > 
> > > Index: fold-const.c
> > > ===================================================================
> > > --- fold-const.c	(revision 186856)
> > > +++ fold-const.c	(working copy)
> > > @@ -3342,6 +3342,11 @@ optimize_bit_field_compare (location_t loc, enum t
> > >    tree mask;
> > >    tree offset;
> > >  
> > > +  /* In the strict volatile bitfields case, doing code changes here may prevent
> > > +     other optimizations, in particular in a SLOW_BYTE_ACCESS setting.  */
> > > +  if (flag_strict_volatile_bitfields > 0)
> > > +    return 0;
> > > +
> > >    /* Get all the information about the extractions being done.  If the bit size
> > >       if the same as the size of the underlying object, we aren't doing an
> > >       extraction at all and so can do nothing.  We also don't want to

	Jakub