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- Newsgroups: comp.sys.sun.misc
- Path: sparky!uunet!spool.mu.edu!uwm.edu!linac!att!princeton!siemens!aad
- From: aad@siemens.com (Anthony A. Datri)
- Subject: Re: FPUless 4/110's (was: Re: Solaris 2 vs Windows NT: ...)
- Message-ID: <C1FHBp.71I@siemens.com>
- Sender: news@siemens.com (NeTnEwS)
- Nntp-Posting-Host: lovecraft.siemens.com
- Organization: Siemens Corporate Research, Princeton (Plainsboro), NJ
- References: <1jf1l0INN6ak@gap.caltech.edu> <16584@auspex-gw.auspex.com> <1jpuc3INN7sn@darkstar.UCSC.EDU> <16596@auspex-gw.auspex.com>
- Date: Mon, 25 Jan 1993 21:07:01 GMT
- Lines: 29
-
-
- In the 4/110, as I remember, the FPU was a daughterboard that plugged into
- the motherboard. Machines could be bought sans-FPU for a while, but Sun stopped
- selling them that way because FPU performance was simply hideous. The R3
- xeyes program, for example, would *peg* an FPU-less 4/110.
-
- >>I have a thing labeled "FPU".. but no weitek 1164/5 chips. Is my machine
- >>essentially "without fpu"?!!
-
- There was a later, higher-performance "FPU2" available. I swear that I
- remember cc taking options for generating slightly better code for specific
- FPU implementations, but I can't find a trace of it now.
-
- >I don't remember whether Sun left out *all* the chips, or just the
- >Weitek chips, in an FPUless machine.
-
- For the 4/110, I'm moderately sure it was the whole daughterboard. Since
- that board held a lot, I'd tend to believe that the whole thing was on
- the daughterboard.
-
- >Or try writing code that fetches the FPSR, and see what the FPU version
- >number is. If it's 7, you have no FPU.
-
- Sun ships /usr/etc/fpuversion, which will give you an integer. A 4/3xx here
- tells me 0; a 4/50 tells me 3.
-
- --
-
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