Date:	Fri, 11 Nov 1994 18:55:38 -0500 (CDT)
From:	Aaron Ucko <UCKO AT VAX1 DOT ROCKHURST DOT EDU>
Subject:	Re: DJGPP & MATH
To:	root AT falcon DOT fat DOT bme DOT hu
Cc:	djgpp AT sun DOT soe DOT clarkson DOT edu
Organization:	Rockhurst College; Kansas City, MO

>As I read much about floating point errors in GCC 1.12 or 1.11 nowdays,
>maybe it is worthwile to report about my experinences.
>I was given a C program written by Steven Pemberton (steven.cwi.nl)
>which tests the capabilities of a C compiler. The copy I have is of Ver. 4.2.
>I compiled and run it succesfully with TURBO C and C++ (Version 1.0 -2.0),
>BORLAND C++ (Version 3.0, 3.1 and 4.0) compilers AND with DJGPP 1.09.
>I switched on DJGPP 1.11 maint 5 a while ago and now it occured to me that
>I gave the new compiler a test, and found out that it just crashes as you see:
>
>	go32 version 1.11.maint5 Copyright (C) 1993 DJ Delorie
>	Produced by config version 4.2, CWI, Amsterdam
>	Compiler claims to be ANSI C level 1
>	
>	Char = 8 bits, signed
>	Short=16 int=32 long=32 float=32 double=64 bits
>	Long double=96 bits
		    ^^ not 80?  I suppose it must be changed for alignment
reasons...

>[...]

>(And again with Version 1.09 of djgpp double and long double 
>WERE IEEE numbers...)
As I suggested, the difference is probably for alignment reasons.

>I do not attach the TESTCCOM.C program to this letter as it is 
>2279 lines long. If there will be enough people interested in it I will post 
>it to this list or will try to put it somewhere on the net.
Could you just give a URL?

--- Aaron Ucko (ucko AT vax1 DOT rockhurst DOT edu; finger for PGP public key) -=- httyp!
-=*=-Just because you're paranoid doesn't mean they aren't out to get you.-=*=-
Geek code 2.1 [finger hayden AT vax1 DOT mankato DOT msus DOT edu for explanation]: 
 GCS/M/S d(-) H s g+ p? !au a-- w+ v+ C++(+++)>++++ U-(S+)>++++ P+ L>++ 3(-) 
 E-(----) !N>++ K- W(--) M-(--) V(--) po-(--) Y+(++) t(+) !5 j R G tv--(-) 
 b+++ !D(--) B--(---) e>++++(*) u++(@) h!() f(+) r-(--)>+++ n+(-) y?

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