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

[Zoltán Majó]

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