ICS312 Machine-level and Systems Programming

Transcription

1 Computer Architecture and Programming: Examples and Sample Problems ICS312 Machine-level and Systems Programming Henri Casanova

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3 Somehow, the is initialized to some content, which is an address (we ll see how that happens much later)

4 Fetch the content (instruction) at address , which is , and store it in the current instruction

5 Increment the

6 Decode instruction Say it means: Load the value at address and store it in the second

7 Send signals to all hardware components to execute the instruction: load the value at address, which is and store it in the second

8 Fetch the content (instruction) at address , which is , and store it in the current instruction

9 Increment the

10 Decode instruction Say it means: Do a logical NOT on the second

11 Send signals to all hardware components to execute the instruction: do a logical NOT on the second

12 Fetch the content (instruction) at address , which is , and store it in the current instruction

13 Increment the

14 Decode instruction Say it means: Store the value in the second to memory at address

15 Send signals to all hardware components to execute the instruction: store the value in the second, which is , to memory at address

16 Practice With the following instruction set definition and machine state, what is the new memory state after execution completes? code operation Increment the Decrement the Save to address not()

17 Fetch the instruction: Execute it: increment to value Fetch the next instruction: Execute it: save value to address code operation Increment the Decrement the Save to address not()

18 Fetch the instruction: Execute it: increment to value Fetch the next instruction: Execute it: save value to address code operation Increment the Decrement the Save to address not()

19 Fetch the instruction: Execute it: increment to value Fetch the next instruction: Execute it: save value to address code operation Increment the Decrement the Save to address not()

20 Fetch the instruction: Execute it: increment to value Fetch the next instruction: Execute it: save value to address code operation Increment the Decrement the Save to address not()