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assemblyx86masm32

x86 assembly extreme novice inquiry: "invalid instruction operands"?

The code below is only a small fraction of the program I am currently attempting to write, but no other parts of the program are relevant, so I only pasted what was necessary. Anyway, what I am trying to do is move the value stored within inputLoopCounter into ecx in order to determine how many times a loop should execute. However, when I attempt to assemble this program, I get the error mentioned in the question title. Can anybody explain the reason for this?

.data
inputLoopCounter BYTE -1

.code
mov   ecx,inputLoopCounter
Solution

  • One possible solution would be to replace inputLoopCounter BYTE -1 by inputLoopCounter DWORD -1.