RFR: 8073093: AARCH64: C2 generates poor code for ByteBuffer accesses
aph at redhat.com
Fri Feb 13 16:07:13 UTC 2015
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