[m-dev.] for review: bug-avoidance in value numbering

[Fergus Henderson]

On 13-Mar-1998, Zoltan Somogyi <zs at cs.mu.OZ.AU> wrote:
> 
> value_number.m:
> 	Do not attempt to optimize code sequences that manipulate tickets.
> 	That code is buggy, and it is not worth fixing in this incarnation
> 	of the value numbering optimization.

The code in the diff also disables optimization of code sequences
that contain c_code, pragma_c, or block instructions.  Why?

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
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