Adds reciprocal squre root SIMD instructions for ARM.

Adds reciprocal squre root SIMD instructions for ARM.

R=regis@google.com

Committed: https://code.google.com/p/dart/source/detail?r=25291

[regis, 2013-07-22 16:02:53]

LGTM

Just curious regarding the change to get_qregister(): was there a compiler issue
with returning a 128-bit value?

[zra, 2013-07-22 16:33:14]

On 2013/07/22 16:02:53, regis wrote:
> LGTM
> 
> Just curious regarding the change to get_qregister(): was there a compiler
issue
> with returning a 128-bit value?

No compiler issue. I just wanted to still be able to call get_qregister at the
top of the Decode function even though the qn field of an instruction might not
be valid. The other option is copying get_qregister for the qn field only in the
cases where it's needed.

[regis, 2013-07-22 16:41:06]

On 2013/07/22 16:33:14, zra wrote:
> On 2013/07/22 16:02:53, regis wrote:
> > LGTM
> > 
> > Just curious regarding the change to get_qregister(): was there a compiler
> issue
> > with returning a 128-bit value?
> 
> No compiler issue. I just wanted to still be able to call get_qregister at the
> top of the Decode function even though the qn field of an instruction might
not
> be valid. The other option is copying get_qregister for the qn field only in
the
> cases where it's needed.

Mmm, I still do not get it. Let's chat in person, that is if I can make it to
work today with all the accidents... The shuttle is driving us all over the Bay
Area to avoid them.

[zra, 2013-07-22 18:19:52]

Committed patchset #2 manually as r25291 (presubmit successful).