Re: [tuples] the intermittent bootstrap problem.

["Rafael Espindola" <espindola at google dot com>]

>  That is intermittent indeed.  I suppose you also tried running cc1 directly
> from the command line.

I did.
>
>  Yes, this would make it almost impossible to find a reduced testcase, but I
> don't see how this would be affected by running on makefile vs. commandline,
> unless you're hashing addresses (and even then...).  Or you can patch
> hashtab.c to force slot 0 independent of the hash.  That would be slow
> though. :-)

I might try something like that (or reducing the hash size at least).

One interesting problem I don't understand. Lets say we have a stmt "a
= b + c". We add it to the table and look for it *before* it is
modified. lookup_avail_expr will find it (as expected) and return its
LHS. Shouldn't we end up replacing "a = b + c" with the uninitialized
"a"? What prevents us from doing it? On trunk we don't call
lookup_avail_expr with the same stmt twice?

So hard to debug code I don't know how it is supposed to work :-(

>  Paolo
>

Cheers,
-- 
Rafael Avila de Espindola

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