Difference between revisions of "Assembly Language Multiplication"
(Created page with " INP R0,2 INP R1,2 MOV R2,#0 LOOP: ADD R2,R2,R0 SUB R1,R1,#1 CMP R1,#0 BGT LOOP B END END: OUT R2,4 HALT") |
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| − | + | 1 INP R0,2 | |
| − | + | 2 INP R1,2 | |
| − | + | 3 MOV R2,#0 | |
| − | LOOP: ADD R2,R2,R0 | + | 4 LOOP: ADD R2,R2,R0 |
| − | + | 5 SUB R1,R1,#1 | |
| − | + | 6 CMP R1,#0 | |
| − | + | 7 BGT LOOP | |
| − | + | 8 B END | |
| − | END: OUT R2,4 | + | 9 END: OUT R2,4 |
| − | + | 10 HALT | |
| + | |||
| + | Line 1 & 2 will get the two numbers to multiply. | ||
| + | |||
| + | Line 3 will make sure register 2 is already set to zero. | ||
| + | |||
| + | Line 4 contains the label to branch back to, it will also add the second number to the value already in register 2 | ||
| + | |||
| + | Line 5 will minus 1 from the second number, so we know how many times to run the loop. | ||
| + | |||
| + | Line 6 compares the value in register 1 with zero. | ||
| + | |||
| + | Line 7 if the compare result is greater than, we branch to the loop label. | ||
| + | |||
| + | Line 8 will only be reached if the branch greater than above is false. This line just branches to the end. | ||
| + | |||
| + | Line 9 is the end label and will also output the answer of the multiplication. | ||
| + | |||
| + | Line 10 will halt. | ||
Revision as of 09:02, 14 January 2019
1 INP R0,2 2 INP R1,2 3 MOV R2,#0 4 LOOP: ADD R2,R2,R0 5 SUB R1,R1,#1 6 CMP R1,#0 7 BGT LOOP 8 B END 9 END: OUT R2,4 10 HALT
Line 1 & 2 will get the two numbers to multiply.
Line 3 will make sure register 2 is already set to zero.
Line 4 contains the label to branch back to, it will also add the second number to the value already in register 2
Line 5 will minus 1 from the second number, so we know how many times to run the loop.
Line 6 compares the value in register 1 with zero.
Line 7 if the compare result is greater than, we branch to the loop label.
Line 8 will only be reached if the branch greater than above is false. This line just branches to the end.
Line 9 is the end label and will also output the answer of the multiplication.
Line 10 will halt.
