Source Index in assembly

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What do the brackets mean in x86 asm?

I've been confused about this for a while. What is the difference between "si" and "[si]"? (This is using 16-bit NASM syntax)

http://stackoverflow.com/questions/2030366/what-do-the-brackets-mean-in-x86-asm Same question, pretty much. — John Chadwick, Dec 17 '11 at 03:55

score 6 · Accepted Answer · answered Dec 17 '11 at 03:55

6

si refers to the register si. [si] refers the address pointed to by si.

mov ax, si    //  Copy the "si" to "ax".

mov ax, [si]  //  Load the value stored at address "si" into "ax".

answered Dec 17 '11 at 03:55

Mysticial

1

so si, is basically the address, and [si] is the value pointed to by this address? – JAW1025 Dec 17 '11 at 03:59

1 Answers1