Path: utzoo!utgpu!water!watmath!clyde!att!rutgers!ucsd!ames!ncar!tank!oddjob!uxc!uxc.cso.uiuc.edu!uxe.cso.uiuc.edu!mcdonald
From: mcdonald@uxe.cso.uiuc.edu
Newsgroups: comp.arch
Subject: Re: Moving floating point values around
Message-ID: <46500025@uxe.cso.uiuc.edu>
Date: 24 Aug 88 14:46:00 GMT
References: <4256@lynx.UUCP>
Lines: 8
Nf-ID: #R:lynx.UUCP:4256:uxe.cso.uiuc.edu:46500025:000:402
Nf-From: uxe.cso.uiuc.edu!mcdonald    Aug 24 09:46:00 1988


For the 8086 (I am not sure this holds for 80286 and 80386 as well)
using MOVS instructions to move floating operands can be, and
frequently is in practice, a big win. This is because the 8087 can be
doing a floating add or multiply or (big win!) logarithm 
at the same time (overlapped execution). The Microsoft compiler
doesn't really use this very well, but for numerical work it
can matter a lot.