Someone can tell me how to compare two arguments (RDI and RSI) in ASM x64 ?
I have a problem on compilation when I use:
cmp byte[rdi+rax],byte[rsi+rax]
I'm getting an error:
"error: invalid combination of opcode and operands"
cmp instruction, like the majority of x86/x86-64 instructions, allows at most one memory operand. So, to compare contents of two memory locations, you need to load at least one of them into a register:
mov cl, byte[rdi+rax]
cmp cl, byte[rsi+rax]