[PATCH] aarch64: Implement math acceleration via builtins

[Szabolcs Nagy]

On 20/10/17 21:16, Michael Collison wrote:
> Patch updated with upstream comments. ChangeLog updated as well.
> 
> Tested on aarch64-linux-gnu with gcc-5.4 and gcc-6. Okay for trunk?
> 
> 2017-10-20  Michael Collison  <michael.collison@arm.com>
...
>> 	* sysdeps/aarch64/fpu/Makefile: Build e_sqrt[f].c with
>> 	-fno-math-errno.

i managed to miss this new Makefile in the commit.

but then i saw that lround, llround, lroundf, llroundf builtins
fail to inline as single instruction without -fno-math-errno
(at least with the toolchain i tried), so i added those to
the makefile, committed as in the attached patch.

however this feels fragile, we probably have to add the
-fno-math-errno flag to all math functions.

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