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    Enhancement 
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    Resolution: Fixed
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     P4 P4
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    12
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        b17
                    Change signature of enqueue_useful_gc_barrier(), eliminate_useless_gc_barriers(). Change set_req() to set_req_X() in some places so disconnected input has a chance to be reprocessed. Add calls to step_over_gc_barrier() in places where peeking through a barrier helps local optimizations.
            
- relates to
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                    JDK-8212896 AIX build breaks after 8212611 -           
- Resolved
 
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                    JDK-8236181 C2: Remove useless step_over_gc_barrier() in int->bool conversion -           
- Resolved
 
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                    JDK-8305429 Assertion failure: CFG Node with no controlling input? -           
- Closed
 
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