Request for reviews (S): 8005544: Use 256bit YMM registers in arraycopy stubs on x86

[Vladimir Kozlov]

On 12/27/12 2:33 PM, Vladimir Kozlov wrote:
> http://cr.openjdk.java.net/~kvn/8005544/webrev/
>
> New x86 processors with AVX2 have wide memory bus and improved memory
> operations with YMM registers. Use them to copy data in arraycopy stubs.

Also use them in array_fill code.

>
> Most changes in stubGenerator_x86_64.cpp are renaming of copy_32_bytes
> to copy_bytes since now the code copies 64 or 32 bytes per iteration.
>
> Ran compiler regression tests with 64- and 32-bit VM.
>
> Thanks,
> Vladimir
>