3 ms·

Intel provides bit-accurate code. In older chips it used a faithful bipartite ROM: https://web.archive.org/web/20120124193536id_/http://www.acsel-lab.com/arith

• mabster 2y ago
  I don't recall the coprocessor having either reciprocal or reciprocal square root? I didn't do much Intel until later in my career though, so I might be missing something though. Both _mm_rcp_ps (rcpps) and _mm_rsqrt_ps (rsqrtps) are only good for about half the bits.