MULTI-SECTION GARBAGE COLLECTION SYSTEM INCLUDING MULTI-USE SOURCE REGISTER

A computer system is configured to perform a garbage collection process within a computing environment. The computer system includes a memory having a load-monitored region managed by a runtime environment. A computer processor is configured to perform operations including executing an instruction to load a doubleword, where the instruction includes a destination register. The operations further include loading into the destination register a pointer address of a pointer when the pointer indicated by the instruction points to a first location located in the load-monitored region. The operations further include invoking a garbage collection event-based branch (EBB) in response to reading the pointer address from the destination register. In response to invoking the garbage collection EBB, an object indicated by the pointer address is moved via a handler from the first location in memory to a second location in memory that is located outside of the load-monitored region.