[m-dev.] for review: fix inst performance problem

[Tyson Dowd]

On 22-Feb-2000, Thomas Charles CONWAY <conway at cs.mu.OZ.AU> wrote:
> On Tue, Feb 22, 2000 at 02:32:56AM EST, Fergus Henderson wrote:
> > If this one passes bootcheck, then I'll go ahead and commit it.
> > I'll also commit it on the version-0_9_x branch.
> > 
> > With a bit of luck, this fix might go at least some of the way
> > towards addressing the performance problems on the alias
> > branch.  It would be nice if someone who has been working
> > on that branch would merge this change in and see how
> > it affects the reported performance problems on the alias
> > branch.
> > 
> > ----------
> > 
> > Estimated hours taken: 6
> > 
> > Fix a performance problem reported by Tom Conway,
> > that caused the compiler to take forever when compiling
> > very simple test cases making use of user-defined insts.
> 
> Should we put something in the tests for this? It shouldn't
> be too hard to test, since the performance problem was exponential.

I think this is an excellent idea.  Actually automatically testing the
performance might not be necessary, but certainly the test case should
be kept.

Tyson.
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