Commits on Aug 21, 2019

1. Improve Escape Analysis under OSR …

   The preEscapeAnalysis optimization, which was introduced in a previous
   change, looks for calls to OSRInductionHelper and adds a fake
   prepareForOSR call that references all live auto symrefs and pending
   pushes.  Any object that ends up as a candidate for stack allocation
   that appears to be used by such a fake prepareForOSR call can be
   heapified at that point by Escape Analysis.
   
   During EA itself, those references on prepareForOSR calls are marked
   as ignoreable for the purposes of determining whether an object can be
   stack allocated.
   
   Submitted on behalf of Andrew Craik <ajcraik@ca.ibm.com>
   
   Signed-off-by:  Henry Zongaro <zongaro@ca.ibm.com>

   

   hzongaro committed Aug 21, 2019
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2. Use node global index to access entries in _ignoreableUses …

   The code in findIgnoreableUses that populates the TR_BitVector,
   _ignoreableUses, uses the global indices of nodes to index the
   TR_BitVector.  Code in checkDefsAndUses was using the value numbers of
   nodes to check the entries in _ignoreableUses.
   
   Fixed checkDefsAndUses to use nodes' global indices instead.  Also,
   reorganized the code checking _ignoreableUses to pull the invariant
   check out of a loop.
   
   Signed-off-by:  Henry Zongaro <zongaro@ca.ibm.com>

   

   hzongaro committed Aug 21, 2019
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