[m-rev.] for review: unboxed float ctor args in high-level C grades on 32-bit

[Julien Fischer]

On Wed, 24 Aug 2011, Peter Wang wrote:

> Branches: main
>
> Store double-precision `float' constructor arguments in unboxed form,
> in high-level C grades on 32-bit platforms, i.e. `float' (and equivalent)
> arguments may occupy two machine words.
>
> As the C code generated by the MLDS back-end makes use of MR_Float variables
> and parameters, float (un)boxing may be reduced substantially in many programs.

That looks fine.

Julien.
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