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Re: combine permutations in gimple
On Mon, 13 Aug 2012, Marc Glisse wrote:
I'll give it a few more days for the conversation to settle, so I know what I
should do between:
- the barely modified patch you accepted,
- the check asked by Jakub,
- the restriction to identity that prevents any regression (well...),
- something else?
I didn't realize the conversation would go quiet immediatly...
Is someone willing to take the responsibility of telling me which approach
is right? I can add Jakub's checks (though I am not sure how I would test
them), but I would rather not do it if the conclusion is that they are
either unnecessary (original patch is ok) or insufficient (don't avoid
Ramana's regressions). I can do the very safe option 3 (only combine
permutations when the result is the identity permutation), but I first
want to make sure the more general thing is bad.
(sorry, it's my first patch that gets conflicting answers...)