480     old->replace_by(v);

   480     old->replace_by(v);

   481     return yank_if_dead(old, current_block, &value, &regnd);

   481     return yank_if_dead(old, current_block, &value, &regnd);

   482   }

   482   }

   483 

   483 

   484   int yank_if_dead( Node *old, Block *current_block, Node_List *value, Node_List *regnd );

   484   int yank_if_dead( Node *old, Block *current_block, Node_List *value, Node_List *regnd );

   485   int elide_copy( Node *n, int k, Block *current_block, Node_List &value, Node_List &regnd, bool can_change_regs );

   486   int elide_copy( Node *n, int k, Block *current_block, Node_List &value, Node_List &regnd, bool can_change_regs );

   486   int use_prior_register( Node *copy, uint idx, Node *def, Block *current_block, Node_List &value, Node_List &regnd );

   487   int use_prior_register( Node *copy, uint idx, Node *def, Block *current_block, Node_List &value, Node_List &regnd );

   487   bool may_be_copy_of_callee( Node *def ) const;

   488   bool may_be_copy_of_callee( Node *def ) const;

   488 

   489 

   489   // If nreg already contains the same constant as val then eliminate it

   490   // If nreg already contains the same constant as val then eliminate it