Folding constants for floats

[Kyle Van Berendonck]

Hi,

I'm cutting my teeth on some constant folding for floats in the cmm.

I have a question regarding the ticket I'm tackling:

Should floats be folded with infinite precision (and later truncated to the
platform float size) -- most useful/accurate, or folded with the platform
precision, i.e. double, losing accuracy but keeping consistent behaviour
with -O0 -- most "correct"?

I would prefer the first case because it's *much* easier to implement than
the second, and it'll probably rot less.

Regards.
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