JDK-8252682 : investigate PhaseChaitin::post_allocate_copy_removal after solaris removal
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 16
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2020-09-01
  • Updated: 2022-11-29
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tbdUnresolved
Related Reports
Relates :  
JDK-8248337 - sparc related code clean up after solaris removal
Description
in postaloc.cpp:749
        // If the value occupies a register pair, record same info
        // in both registers.
        OptoReg::Name nreg_lo = OptoReg::add(nreg,-1);
        if( RegMask::can_represent(nreg_lo) &&     // Either a spill slot, or
            !lrgs(lidx).mask().Member(nreg_lo) ) { // Nearly always adjacent
          // Sparc occasionally has non-adjacent pairs.
          // Find the actual other value
          RegMask tmp = lrgs(lidx).mask();
          tmp.Remove(nreg);
          nreg_lo = tmp.find_first_elem();
        }
this piece of code need revisit if it is sparc only after solaris removal.