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Refer to the below code snippet and determine the value of R if P is 5 and Q is 3: .ORIG x3000 LDI R3, P LDI R4, Q ADD R5, R3, R4 STI R5, R HALT P. FILL x3200

Refer to the below code snippet and determine the value of R if P is 5 and Q is 3: .ORIG x3000 LDI R3, P LDI R4, Q ADD R5, R3, R4 STI R5, R HALT P. FILL x3200

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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### Example Assembly Code and Value Determination Refer to the below code snippet and determine the value of R if P is 5 and Q is 3: ```asm .ORIG x3000 LDI R3, P LDI R4, Q ADD R5, R3, R4 STI R5, R HALT P .FILL x3200 Q .FILL x3201 R .FILL x3202 .END ``` #### Understanding the Code: 1. **.ORIG x3000**: - This directive sets the starting address of the program at location `x3000`. 2. **LDI R3, P**: - The instruction `LDI` stands for "Load Indirect". This loads the value stored at the memory location specified by the address in `P` (which is `x3200`) into register `R3`. Given that `P = 5`, the value stored at memory location `x3200` is `5`. 3. **LDI R4, Q**: - Similarly, this instruction loads the value stored at the memory location specified by the address in `Q` (which is `x3201`) into register `R4`. Given that `Q = 3`, the value stored at memory location `x3201` is `3`. 4. **ADD R5, R3, R4**: - This instruction adds the contents of registers `R3` and `R4` and stores the result in register `R5`. Therefore, `R5 = 5 + 3 = 8`. 5. **STI R5, R**: - The instruction `STI` stands for "Store Indirect". This stores the value in register `R5` at the memory location specified by the address in `R` (which is `x3202`). Therefore, `x3202` will contain `8`. 6. **HALT**: - This instruction halts the execution of the program. 7. **P .FILL x3200**: - This stores the value `x3200` as the address for `P`. 8. **Q .FILL x3201**: - This stores the value `x3201` as the address for `Q`. 9. **R .FILL x3202
Transcribed Image Text:### Example Assembly Code and Value Determination Refer to the below code snippet and determine the value of R if P is 5 and Q is 3: ```asm .ORIG x3000 LDI R3, P LDI R4, Q ADD R5, R3, R4 STI R5, R HALT P .FILL x3200 Q .FILL x3201 R .FILL x3202 .END ``` #### Understanding the Code: 1. **.ORIG x3000**: - This directive sets the starting address of the program at location `x3000`. 2. **LDI R3, P**: - The instruction `LDI` stands for "Load Indirect". This loads the value stored at the memory location specified by the address in `P` (which is `x3200`) into register `R3`. Given that `P = 5`, the value stored at memory location `x3200` is `5`. 3. **LDI R4, Q**: - Similarly, this instruction loads the value stored at the memory location specified by the address in `Q` (which is `x3201`) into register `R4`. Given that `Q = 3`, the value stored at memory location `x3201` is `3`. 4. **ADD R5, R3, R4**: - This instruction adds the contents of registers `R3` and `R4` and stores the result in register `R5`. Therefore, `R5 = 5 + 3 = 8`. 5. **STI R5, R**: - The instruction `STI` stands for "Store Indirect". This stores the value in register `R5` at the memory location specified by the address in `R` (which is `x3202`). Therefore, `x3202` will contain `8`. 6. **HALT**: - This instruction halts the execution of the program. 7. **P .FILL x3200**: - This stores the value `x3200` as the address for `P`. 8. **Q .FILL x3201**: - This stores the value `x3201` as the address for `Q`. 9. **R .FILL x3202
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