RFR: 8198571: [JVMCI] must not install wide vector code unless runtime supports it

[Vladimir Kozlov]

Hi Doug,

Are you planning changes to check MaxVectorSize value when vectors are generated by Graal?
Throwing exception during code installation is very late and expensive (you have to throw out all methods with vectors 
after spending CPUs to compile them).

Thanks,
Vladimir

On 2/23/18 8:57 AM, Doug Simon wrote:
> As shown in https://github.com/oracle/graal/issues/303, a bug in a JVMCI compiler can result in vector code being installed even if the runtime doesn't support it. JVMCI should be defensive and raise an exception in this case.
> 
> https://bugs.openjdk.java.net/browse/JDK-8198571
> http://cr.openjdk.java.net/~dnsimon/8198571/
> 
> -Doug
>