The article is doing profiling on x86-64. There is no FMOV. Floating point on x86-64 is done in the SSE or AVX (xmm, ymm) registers loaded with MOVD/Q which has

The article is doing profiling on x86-64. There is no FMOV. Floating point on x86-64 is done in the SSE or AVX (xmm, ymm) registers loaded with MOVD/Q which has basically the same addressing modes as any of the usual GPR loads/moves. In any case in optimized code, something like a scalar clone is inlined and would not be a consistent accountable and localizable operation (and may even be optimized away).