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Re-enable RegDepCopyRemoval for value types #7497

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Re-enable RegDepCopyRemoval for value types #7497

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23 changes: 0 additions & 23 deletions compiler/control/OMROptions.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2423,29 +2423,6 @@ OMR::Options::jitLatePostProcess(TR::OptionSet *optionSet, void * jitConfig)

}

#ifdef J9_PROJECT_SPECIFIC

// Disable regDepCopyRemoval when value types are enabled
//
// In OpenJ9, the implementation of value types does not behave well with
// regDepCopyRemoval. Specifically, the ifacmp{eq,ne} operations rely on
// lowering that requires basic block splitting after GRA.
// RegDepCopyRemoval currently leaves the trees in a state that the post
// GRA block splitter cannot handle. So, for now, the optimization is
// disabled.
//
// https://github.com/eclipse-openj9/openj9/issues/9712 was opened to track the
// work to re-enable the optimization.
//
// Unfortunately, the design of the option processing framework requires
// the disabling code to be in OMR (rather than OpenJ9) and guarded
// with J9_PROJECT_SPECIFIC.
if (TR::Compiler->om.areValueTypesEnabled())
{
_disabledOptimizations[regDepCopyRemoval] = true;
}

#endif

// The adding of the enumeration of register names takes up a lot
// of heap storage (as much as 100+ MBs) for very large programs. Here
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