FASM汇编如何在64位程序中使用FPU

I have this code in FASM that calculates a measurement using the FPU that works great in 32 bit programs. How would I convert it so it would run in 64 bit program. when I use this code in the 64 bit program it gives me 0.00000 instead of a number like 54.24457 I think it is something with the FPU instructions but I don't know enough about assembly or 64 bit programming to get it to workI have this code in FASM that calculates a meas