Category:ARM Assembly: Difference between revisions
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===Separate Destination for Math=== |
===Separate Destination for Math=== |
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With the x86, 68000, and other similar processors, arithmetic functions take two operands: the source and the destination. Anytime you add two numbers, one of them gets changed. This is not the case with the ARM. The destination can be a third register that isn't involved in the |
With the x86, 68000, and other similar processors, arithmetic functions take two operands: the source and the destination. Anytime you add two numbers, one of them gets changed. This is not the case with the ARM. The destination can be a third register that isn't involved in the arithmetic whatsoever! |
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<lang ARM Assembly> add r3,r2,r1 ;add r2 to r1 and store the result in r3. r1 and r2 are unchanged.</lang> |
<lang ARM Assembly> add r3,r2,r1 ;add r2 to r1 and store the result in r3. r1 and r2 are unchanged.</lang> |
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