> avoid div instructions in favour of floating point multiply.
  > Is this still faster on recent CPUs?

NB - >>[Taking this question out of context]<< - looks like the answer is "no". From a quick test:

- intel Broadwell: 64-bit integer div is fastest, float div is 69% slower, float mul is 50% slower;

- AMD Ryzen: 64-bit integer div is fastest, float div is 47% slower, float mul is 60% slower;

- ARM11 (Raspberry Zero): 64-bit integer div is fastest, float div is 138% slower, float mul is 159% slower.

quick-and-dirty test used: https://pastebin.com/raw/4XqnuXL5