[Patch 2/4] [libgcc] Add double to half conversions.

[James Greenhalgh]

Hi,

Conversions from double precision floats to the ARM __fp16 are required
to round only once.

This patch adds a functions named __gnu_d2h_ieee and
__gnu_d2h_alternative for double to __fp16 conversions in IEEE and ARM
alternative format. The make use of the existing __gnu_float2h_internal
conversion function which rounds once only.

Bootstrapped on an ARMv8-A machine with no issues, and cross-tested with
a range of multilibs.

OK?

Thanks,
James
---

libgcc/

2016-10-24  James Greenhalgh  <james.greenhalgh@arm.com>
	    Matthew Wahab  <matthew.wahab@arm.com>

	* config/arm/fp16.c (binary64): New.
	(__gnu_d2h_internal): New.
	(__gnu_d2h_ieee): New.
	(__gnu_d2h_alternative): New.

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