RFR: 8073093: AARCH64: C2 generates poor code for ByteBuffer accesses

[Vladimir Kozlov]

Changes are fine.

I agree with Alan. Please, wait when we merge aarch64 stage into jdk9/dev and then push this fix into jdk9 (by sponsor). 
We should finish testing of stage repo "soon".

Thanks,
Vladimir

On 2/13/15 8:07 AM, Andrew Haley wrote:
> On 02/13/2015 04:05 PM, Alan Bateman wrote:
>> On 13/02/2015 13:38, Andrew Haley wrote:
>>> java.​nio.​DirectByteBuffer.getXXX is slow for types larger than byte
>>> because the runtime does not know that AArch64 can perform unaligned
>>> memory accesses.
>>>
>>> The problem is due to this code in java.nio.Bits.unaligned():
>>>
>>>           unaligned = arch.equals("i386") || arch.equals("x86")
>>>               || arch.equals("amd64") || arch.equals("x86_64");
>>>
>>> If we add AArch64 to this list code quality is very much improved.
>>>
>>> http://cr.openjdk.java.net/~aph/8073093/
>>>
>> Make sense, I assume this will go in when JEP 237 is pushed.
>
> It will, but I need approval to push to the JEP 237 staging repo.
> 'Cos them's the rules.  :-)
>
> Andrew.
>