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From: hope@gatech.CSNET (Theodore Hope)
Newsgroups: net.micro.att
Subject: 3b2/400 and floating point
Message-ID: <2403@gatech.CSNET>
Date: Sat, 11-Jan-86 13:20:10 EST
Article-I.D.: gatech.2403
Posted: Sat Jan 11 13:20:10 1986
Date-Received: Sun, 12-Jan-86 00:36:44 EST
Organization: School of Information and Computer Science, Georgia Tech, Atlanta
Lines: 28

I recently unpacked and brought up a 3b2/400, which supposedly comes with the
WECO 32??? math chip.  Just to see how fast (or slow) the fp hardware is, I
wrote a 4 line program, compiled it WITHOUT the infamous '-f' option, and got
an Illegal Instruction trap.  When compiled WITH '-f,' the program worked.
Here's the catch:  Since we didn't buy the Software Generation utilities
(cc, as, ld, etc,) I moved them over from a 3b2/300 (no math chip).  Is it so
that there is a special 'as' and/or special libraries which take care of the fp handling?  I don't think so, since all fp traps should be handled in a software-
transparent fashion (cpu traps, hands off math instruction to the math chip,
gets result back, keeps going...)  Or does the machine not come with the math
chip as standard equipment?  What's the scoop?

(BTW, here's the prog:
  float x, y;

  main ()

  {
     x = 3.14159;
     y = x + 2.432;
  }
)

Any insight or useful comments will be appreciated.
-- 
Theodore Hope
School of Information & Computer Science, Georgia Tech, Atlanta GA 30332
CSNet:	hope@gatech		ARPA:	Hope%GATech.CSNet @ CSNet-Relay.ARPA
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