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vtlmks/gist:770b9cc0ebb99690928dfd7adb9ee5ab

Created April 4, 2019 18:32
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gistfile1.txt
memcmp Cld
Mov r10, rdi ; save
Mov r11, rsi ; save
Mov rdi, rcx
Mov rsi, rdx
Mov rcx, r8
Mov rdx, r8
Xor eax, eax
Cmpsb
Je .done
.not_equal: Mov al, [rdi-1] ; check the last bytes
Movzx ecx, byte [rsi-1]
Sub eax, ecx
.done Mov rdi, r10
Mov rsi, r11
Ret
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