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

Vladimir Kozlov vladimir.kozlov at oracle.com
Wed Jul 20 15:45:53 PDT 2011

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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).

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