rasm2 giving different output each time for x64

rasm2 giving different output each time for x64

Disassembling is great but when trying to re-assemble to opcode it gives different results each time. Example: C:rasm2 -a x86 -b 64 -d 48898D80FEFFFF mov qword rbp - 0x180, rcx C:rasm2 -a x86 -b 64 mov qword rbp - 0x180, rcx 49898d80feffff See the difference The first byte has been changed and it keep the same behavior each time. Another issue is, I couldnt get it to assemble this instruction with 8 bytes it only gives me 4 bytes: C:rasm2 -a x86 -b 64 -d C7458C0000803F mov dword rbp - 0x74, 0x3f800000 C:rasm2 -a x86 -b 64 mov dword rbp - 0x74, 0x3f800000 41c67400 But when I remove the the bits flag and set the registers to 32 bit it gives me the correct opcodes C:rasm2 -a x86 mov dword ebp - 0x74, 0x3f800000 c7458c0000803f Why is it doing this and what did I do wrong GitHub issue link for future reference.

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