double rounding in x86

[Samuel A. Figueroa]

In a previous message, Chris Hinds (uunet!wtkatz.sps.mot.com!chindsauunet.uu.net)
write:
  >True statement for a 68681 or 68682. However, on the 68040 and 68060 the
  >penalties for emulation of a single-precision or double-precision machine
  >were eliminated. In other words, setting the rounding precision to single
  >or double does not degrade performance of native instructions or emulated
  >instructions.

According to the 68040 User's Manual, there is still a penalty in rounding to
single or double precision on the 68040 in terms of performance.  Maybe this
manual is mistaken.  (Mr. Hinds, can you verify this?)

- Sam Figueroa (figueroaacs.nyu.edu)