[9] RFR (XS) 8059139: It should be possible to explicitly disable usage of TZCNT instr w/ -XX:-UseBMI1Instructions

[Igor Veresov]

Looks good.

igor

On Oct 10, 2014, at 3:14 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:

> https://bugs.openjdk.java.net/browse/JDK-8059139
> http://cr.openjdk.java.net/~kvn/8059139/webrev/
> 
> Before JDK-8055494 it was possible to disable usage of all BMI1-related instructions by passing -XX:-UseBMI1Instructions to JVM, but fix for JDK-8055494 made it impossible to disable usage of TZCNT.
> 
> Disable TZCNT with -XX:-UseBMI1Instructions flag specified on command line.
> 
> Testing jtreg,jprt