RFR: 8073093: AARCH64: C2 generates poor code for ByteBuffer accesses
vladimir.kozlov at oracle.com
Fri Feb 13 16:56:41 UTC 2015
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".
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.
>> 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. :-)
More information about the hotspot-dev