alias slowdown?

[Andrew MacLeod]

On Fri, 2006-11-17 at 22:19 -0500, Daniel Berlin wrote:
> On 11/17/06, Andrew MacLeod <amacleod@redhat.com> wrote:
> > On Fri, 2006-11-17 at 12:22 -0500, Andrew MacLeod wrote:
> > > I just tried compiling cplusplus_grammer.ii with mainline, checking
> > > disabled, and had to stop it after 30 minutes (use to be <50 seconds on
> > > my x86-linux box).  A quick check with GDB seems to show that its
> > > spending in inordinate amount of time in may_alias:
> 
> We used to basically say all of these cases pointed to everything and
> anything, and collapse them very quickly.
> Now we compute  a correct set of aliases and escaped variables
> It takes a while in huge cases like this.
> I'm working on fixing it.

In the meantime, is there a simple way to disable this "more correct"
mechanism so I can get my timings?

Andrew