Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!usc!snorkelwacker!husc6!endor!siegel
From: siegel@endor.harvard.edu (Rich Siegel)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Lowly FORTRAN & SANE Question
Message-ID: <3147@husc6.harvard.edu>
Date: 13 Nov 89 01:42:38 GMT
References: <227700051@uxa.cso.uiuc.edu>
Sender: news@husc6.harvard.edu
Reply-To: siegel@endor.UUCP (Rich Siegel)
Organization: Symantec Language Products Group
Lines: 38

In article <227700051@uxa.cso.uiuc.edu> nljg0470@uxa.cso.uiuc.edu writes:
>
>	Question:  In Think C, you can choose, via which library you link, 
>whether your code will utilize SANE, the FPU, or a little bit of both.  What

	Actually, the choice is made by selecting the appropriate options
from the Options... dialog; the choice of library is made simply to complement
the choice of code generation, so that everything works correctly. The same
holds true for other compilers: choose the code generation, and then link
the libraries to match.


>to use the 68881/68882 optiion, is SANE totally bypassed and the built in 
>coprocessor functions are used exclussively or does it still use SANE in order
>to get the 96bit (I think it's 96 but I've been wrong before (yes, it's true))

As it turns out the 96-bit data type has the same precision as the 80-bit
data type, but has an extra word of zeros after the exponent "to force
longword alignment and for future expansion", according to the Motorola
manuals.

Generally, the compiler will do everything possible using the FPU, but some
functions (such as string-to-binary conversions) are still done by SANE.

R.


~~~~~~~~~~~~~~~
 Rich Siegel
 Staff Software Developer
 Symantec Corporation, Language Products Group
 Internet: siegel@endor.harvard.edu
 UUCP: ..harvard!endor!siegel

"There is no personal problem which cannot be solved by sufficient
application of high explosives."

~~~~~~~~~~~~~~~