x86 - Why does 0xE1 0x4F disassemble to different instructions in LLVM and NDISASM? -


in bash shell:

$ echo "0xe1 0x4f" | llvm-mc-3.2 -disassemble -triple i386      .section    __text,__text,regular,pure_instructions     loope   79 $ echo -n "\xe1\x4f" | ndisasm -b 32 -                     00000000  e14f              loope 0x51

but 0x51 81 in decimal.

it should disassemble as

loope *+79

that is, loop branch relative forward 79 bytes. in ndisasm case, instruction @ address 0 (so next instruction, relative branch computed off, address 2), computes target (absolute) address you: 2+79 = 81 (0x51)


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