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#x86 machine code: 7 bytes

x86 machine code: 7 bytes

66 0F 3A 44 C1 00 C3  pclmulqdq xmm0, xmm1, 0 \ ret

Only two instructions. pclmulqdq does the heavy lifting, it literally implements that type of xor-multiplication. ret to make it a callable function, hopefully satisfying the requirement of "outputting" the result (in the return value, xmm0). Putting integer arguments in xmm args is a bit unusual, but I hope you'll forgive me.

#x86 machine code: 7 bytes

66 0F 3A 44 C1 00 C3  pclmulqdq xmm0, xmm1, 0 \ ret

Only two instructions. pclmulqdq does the heavy lifting, it literally implements that type of xor-multiplication. ret to make it a callable function, hopefully satisfying the requirement of "outputting" the result (in the return value, xmm0). Putting integer arguments in xmm args is a bit unusual, but I hope you'll forgive me.

x86 machine code: 7 bytes

66 0F 3A 44 C1 00 C3  pclmulqdq xmm0, xmm1, 0 \ ret

Only two instructions. pclmulqdq does the heavy lifting, it literally implements that type of xor-multiplication. ret to make it a callable function, hopefully satisfying the requirement of "outputting" the result (in the return value, xmm0). Putting integer arguments in xmm args is a bit unusual, but I hope you'll forgive me.

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user555045
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#x86 machine code: 7 bytes

66 0F 3A 44 C1 00 C3  pclmulqdq xmm0, xmm1, 0 \ ret

Only two instructions. pclmulqdq does the heavy lifting, it literally implements that type of xor-multiplication. ret to make it a callable function, hopefully satisfying the requirement of "outputting" the result (in the return value, xmm0). Putting integer arguments in xmm args is a bit unusual, but I hope you'll forgive me.