Request for reviews (S): 7044738: Loop unroll optimization causes incorrect result

[Vladimir Kozlov]

Thank you, Tom

Vladimir

Tom Rodriguez wrote:
> Looks good.
> 
> tom
> 
> On Jun 1, 2011, at 12:54 PM, Vladimir Kozlov wrote:
> 
>> For next release, too risky for jdk7.
>>
>> http://cr.openjdk.java.net/~kvn/7044738/webrev
>>
>> Fixed 7044738: Loop unroll optimization causes incorrect result
>>
>> It is rare case when OSR compilation is done for nested loop which prevents ciTypeFlow to clone loop's head. As result the control node of loop's nodes is loop's back control. During loop iterations split clone_up_backedge_goo() creates clones for nodes which are pinned to loop's back control and it does not take into account memory dependencies by creating duplicated clones.
>>
>> Added regression test. Tested with full CTW.
>