[9] RFR (S) 8178723: Workaround for failure of CRC32C intrinsic on x86 machines without CLMUL support (JDK-8178720)

[Vladimir Kozlov]

Hi Zoltan,

The fix looks good. Please, add label and fix request comment according to RDP2 rules for JDK 9.

Thanks,
Vladimir

On 4/13/17 7:54 AM, Zoltán Majó wrote:
> Hi,
>
>
> please review the following fix for 8178723. (8178723 is a workaround for 8178720.)
> https://bugs.openjdk.java.net/browse/JDK-8178723
> http://cr.openjdk.java.net/~zmajo/8178723/webrev.00/
>
> The problem is that the CRC32C intrinsic is apparently incorrect on x86 machines without CLMUL support. The tests
> provided by Lutz Schmidt (also part of this change set) have uncovered that problem.
>
> Given the state of JDK 9, I think it's best to split the problem into two parts:
> - (1) this workaround (8178723), which disables the CRC32C intrinsics on x86 machines without CLMUL support; the
> workaround also the tests provided by Lutz (with proper credit  in the final change set);
> - (2) the "proper" fix for the problem is handled in 8178720; I asked Michael Berg to look into that problem.
>
> If (and once) the workaround is fine with you, I'll take care of the fix-request process.
>
> JPRT testing is running at the moment.
>
> Thank you!
>
> Best regards,
>
>
> Zoltan
>