RFR(XXS) 8027751: C1 crashes in Weblogic with G1 enabled

[Igor Ignatyev]

Hi Igor,
What testing did you do?

- Igor

On 11/04/2013 12:59 PM, Igor Veresov wrote:
> G1 barriers use logical operators (xor) on T_OBJECT mixed with T_LONG or T_INT. The current implementation of logical operations on x86 in C1 doesn't allow for long operands to be on stack. There is a special code in the register allocator that forces long arguments in registers on x86. However T_OBJECT can be spilled just fine, and in that case the xor emission will fail.
>
> The shortest fix is to force the allocator to keep operands of type T_OBJECT in registers when doing logical operations (as we do with T_LONG already) on 64bit x86.
>
> Webrev: http://cr.openjdk.java.net/~iveresov/8027751/webrev.0/
>
> Thanks!
> igor
>