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

Fri, 13 Feb 2015 08:09:34 -0800 

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.

-Alan

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