What does the sum of the constant portion of the instruction and the contents of the second register determine in LEGv8 LDUR?

What does the sum of the constant portion of the instruction and the contents of the second register determine in LEGv8 LDUR?

• A. The data to be loaded into the first register
• B. The memory address
• C. The size of the instruction being executed
• D. The type of operation performed

Answer: (B)

In the LEGv8 LDUR instruction, the sum of the constant portion of the instruction and the contents of the second register determines the memory address from which data will be loaded. LDUR stands for "Load Register Unsigned," and it is used to load data from memory into a specified register. The instruction has a constant value that represents an offset and is added to the address contained in the second register (typically the base address). This calculation results in an effective memory address that points to the actual location in memory where the data resides. Once the memory address is determined, the processor retrieves the data from that address and loads it into the first register specified by the instruction. This understanding of how effective addresses are computed is crucial for working with load and store operations in computer architecture since it highlights the process of addressing memory, which is fundamental to how programs access variables and data stored in memory.

In the LEGv8 LDUR instruction, the sum of the constant portion of the instruction and the contents of the second register determines the memory address from which data will be loaded. LDUR stands for "Load Register Unsigned," and it is used to load data from memory into a specified register.

The instruction has a constant value that represents an offset and is added to the address contained in the second register (typically the base address). This calculation results in an effective memory address that points to the actual location in memory where the data resides. Once the memory address is determined, the processor retrieves the data from that address and loads it into the first register specified by the instruction.

This understanding of how effective addresses are computed is crucial for working with load and store operations in computer architecture since it highlights the process of addressing memory, which is fundamental to how programs access variables and data stored in memory.