[PATCH] Constant folding for cabs and fabs (take 2)

[Roger Sayle]

Hi Joern,
> The builtins-18.c test fails on sh-elf, on all 11 multilibs.
> I can avoid the ICE with a relatively simple patch (see
> previous posting), but then I still get a link error for
> _link_error.
> Likewise, builtins-19.c fails on all sh-elf multilibs except
> those that use 64 bit hardware floating point for double
> (-m4,-m4/-ml,-m4-single,-m4-single/-ml) .

Ok, I'll take a look at it.  I suspect that CSE or GCSE isn't
playing well with CONCAT.  Perhaps they don't realize that a
CONCAT of two constants is a constant, or something similar.

I think your reg_overlap_mentioned_p and convert_move changes
look good, but of course I can't approve anything.  Hopefully,
someone will approve them, which should make fixing the RTL
optimizers easier.

Thanks again for letting me know.

Roger
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