Request for reviews (M): 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post on T5440

[Vladimir Kozlov]

I still need reviews for this.

Thanks,
Vladimir

Vladimir Kozlov wrote:
> http://cr.openjdk.java.net/~kvn/7068051/webrev
> 
> Fixed  7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post on T5440
> 
> Changes I did for 7004535 are incorrect. They do not take into account 
> that cloning/moving predicates below merge points invalidate jvm states 
> recorded in predicate's uncommon trap. Removed predicate cloning from 
> loop peeling optimization and from split fall-in paths. But left it in 
> loop unswitching code which is safe, I think. Don't allow split loop 
> entry path in IGVN optimization for Phi nodes. And do not clone 
> predicates below merge points in split-if optimization. Removed 
> move_loop_predicate() and eliminate_loop_predicates() unused methods.
> 
> Refworkload scores are not affected (sparc and x86).