src/share/vm/opto/postaloc.cpp

*** 221,232 ****
--- 221,248 ----
    // register.
  
    // Also handle duplicate copies here.
    const Type *t = val->is_Con() ? val->bottom_type() : NULL;
  
+   x = n->in(k);
+   bool ignore_self = false;
+   {
+     ignore_self = true;
+     DUIterator_Fast imax, i = x->fast_outs(imax);
+     Node* first = x->fast_out(i); i++;
+     while (i < imax && ignore_self) {
+       Node* use = x->fast_out(i); i++;
+       if (use != first) ignore_self = false;
+     }
+   }
+ 
    // Scan all registers to see if this value is around already
    for( uint reg = 0; reg < (uint)_max_reg; reg++ ) {
+     if (reg == (uint)nk_reg && ignore_self) {
+       continue;
+     }
+ 
      Node *vv = value[reg];
      if( !single ) {             // Doubles check for aligned-adjacent pair
        if( (reg&1)==0 ) continue;  // Wrong half of a pair
        if( vv != value[reg-1] ) continue; // Not a complete pair
      }