NASM: why is cmp byte[rdi], byte[rsi] not compiling?

StackOverflow https://stackoverflow.com/questions/22331054

  •  13-06-2023
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Question

Why this following nasm code does not compile :

cmp byte [rdi], byte [rsi]

whereas this code compiles:

mov al, byte [rsi]
cmp byte [rdi], al
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Solution

Two indirect arguments are not supported. And why not use cmpsb, which compares these two bytes directly?

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