src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/alloc/lsra/ssa/SSALinearScanLifetimeAnalysisPhase.java

*** 22,32 ****
   */
  package org.graalvm.compiler.lir.alloc.lsra.ssa;
  
  import java.util.EnumSet;
  
! import org.graalvm.compiler.debug.Debug;
  import org.graalvm.compiler.lir.LIRInstruction;
  import org.graalvm.compiler.lir.LIRInstruction.OperandFlag;
  import org.graalvm.compiler.lir.LIRInstruction.OperandMode;
  import org.graalvm.compiler.lir.StandardOp.LabelOp;
  import org.graalvm.compiler.lir.ValueConsumer;
--- 22,32 ----
   */
  package org.graalvm.compiler.lir.alloc.lsra.ssa;
  
  import java.util.EnumSet;
  
! import org.graalvm.compiler.debug.DebugContext;
  import org.graalvm.compiler.lir.LIRInstruction;
  import org.graalvm.compiler.lir.LIRInstruction.OperandFlag;
  import org.graalvm.compiler.lir.LIRInstruction.OperandMode;
  import org.graalvm.compiler.lir.StandardOp.LabelOp;
  import org.graalvm.compiler.lir.ValueConsumer;
*** 56,82 ****
  
              SSAUtil.forEachPhiRegisterHint(allocator.getLIR(), allocator.blockForId(label.id()), label, targetValue, mode, (ValueConsumer) (registerHint, valueMode, valueFlags) -> {
                  if (LinearScan.isVariableOrRegister(registerHint)) {
                      Interval from = allocator.getOrCreateInterval((AllocatableValue) registerHint);
  
!                     setHint(op, to, from);
!                     setHint(op, from, to);
                  }
              });
          }
      }
  
!     public static void setHint(final LIRInstruction op, Interval target, Interval source) {
          Interval currentHint = target.locationHint(false);
          if (currentHint == null || currentHint.from() > target.from()) {
              /*
               * Update hint if there was none or if the hint interval starts after the hinted
               * interval.
               */
              target.setLocationHint(source);
!             if (Debug.isLogEnabled()) {
!                 Debug.log("operation at opId %d: added hint from interval %d to %d", op.id(), source.operandNumber, target.operandNumber);
              }
          }
      }
  
      @Override
--- 56,82 ----
  
              SSAUtil.forEachPhiRegisterHint(allocator.getLIR(), allocator.blockForId(label.id()), label, targetValue, mode, (ValueConsumer) (registerHint, valueMode, valueFlags) -> {
                  if (LinearScan.isVariableOrRegister(registerHint)) {
                      Interval from = allocator.getOrCreateInterval((AllocatableValue) registerHint);
  
!                     setHint(debug, op, to, from);
!                     setHint(debug, op, from, to);
                  }
              });
          }
      }
  
!     public static void setHint(DebugContext debug, final LIRInstruction op, Interval target, Interval source) {
          Interval currentHint = target.locationHint(false);
          if (currentHint == null || currentHint.from() > target.from()) {
              /*
               * Update hint if there was none or if the hint interval starts after the hinted
               * interval.
               */
              target.setLocationHint(source);
!             if (debug.isLogEnabled()) {
!                 debug.log("operation at opId %d: added hint from interval %d to %d", op.id(), source.operandNumber, target.operandNumber);
              }
          }
      }
  
      @Override