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Article #1695

8086/8087 Relationship

#1695
From: James Tinkess
Date: Tue, 09 Feb 1988 15:33
23 lines
1414 bytes
I'm reading the documentation on the 8087 NPX. From what I see it appears
that ANY arithmetic instruction will be executed on the 8087 if is present.
This (so the docu says) saves you from having to maintain 2 sets of libraries.
Ok, what does this mean? Does it mean that arithmetic instructions are
translated into 8087 instructions at run-time? Or must the 8087 instructions 
be generated by the assembler. 

What do I want to know?

I have Nabu 1600 running Xenix 2.0b, will the math libraries use the 8087?
If not, how can I make use of the 8087?

I ran a tests with and without the 8087. On 5000 calls to pow(base,pow);
base = e pow = 16; There was about a 1.6 second difference, this test 
may not be 'hard' enough. I would also like a good fp benchmark.

Slightly confused, Thanx...
-- 
"On the 8th day he documented"            James Tinkess 

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Path: arc1-ca.pugleaf.net!utzoo!dciem!nrcaer!xios!jim
From: jim@xios.XIOS.UUCP (James Tinkess)
Newsgroups: comp.sys.intel
Subject: 8086/8087 Relationship
Message-ID: <466@xios.XIOS.UUCP>
Date: 9 Feb 88 15:33:28 GMT
Article-I.D.: xios.466
Posted: Tue Feb  9 10:33:28 1988
Reply-To: jim@xios.UUCP (Jim Tinkess)
Distribution: na
Organization: XIOS Systems Corporation, Ottawa, Ontario, Canada
Lines: 23