[Bug rtl-optimization/57462] ira-costs considers only a single register at a time

[ramana at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57462

Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:

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                 CC|                            |ramana at gcc dot gnu.org

--- Comment #3 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
This is part of the reason why on trunk we currently disable 64 bit arithmetic
in neon in a large number of cases. It's sometimes just not worth it -
Additionally neon doesn't have comparison operations so many times one has
noticed that we keep doing a lot of operations on the neon side and then you
just have to move back to the integer side to the comparisons. So there are
times when this doesn't happen properly. 

Ramana