Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!rice!sun-spots-request
From: rdh@sli.com (or uunet!sli!rdh)
Newsgroups: comp.sys.sun
Subject: Math/trig functions vs -f68881
Keywords: Miscellaneous
Message-ID: <9776@brazos.Rice.edu>
Date: 9 Jul 90 20:17:14 GMT
Sender: root@rice.edu
Organization: Sun-Spots
Lines: 18
Approved: Sun-Spots@rice.edu
X-Sun-Spots-Digest: Volume 9, Issue 253, message 13

What is the meaning of "-f68881" to the Sun3 C compiler? I empirically
observe that it generates inline add/sub/mul/div floating-point
instuctions, but still generates calls to external math library/ies for
the math/trig functions (_fmod, _sin, etc.). What is it supposed to do? Is
there actually a specification somewhere in Sun's manual set -- I looked
in the Floating Point User's Guide, didn't find much help beyond a some-
what content-free 

  In-line code generation puts floating-point instructions in line with
  CPU instructions; such code generated in-line for specific hardware,
  ..., only runs on machines with the specific hardware...

Why doesn't -f68881 take advantage of the hardware sin/etc. functions?

You can email me (rdh @ sli.com   -or-   uunet!sli!rdh) directly, I'll
cull/summarize the replies.

Thankx in Advance!