Path: utzoo!mnetor!uunet!wucs1!wuphys!hpuslma!hpfcse!hpfcmp!hpfcdc!hpfclq!cunniff
From: cunniff@hpfclq.HP.COM (Ross Cunniff)
Newsgroups: comp.sys.hp
Subject: Re: C compiler / Assembler bugs on HP 9000/300
Message-ID: <4260007@hpfclq.HP.COM>
Date: 5 Apr 88 23:09:29 GMT
References: <23519@ucbvax.BERKELEY.EDU>
Organization: Hewlett-Packard
Lines: 47

In article <23519@ucbvax.BERKELEY.EDU>, gregc@miro.Berkeley.EDU (Greg Couch)
writes:
> Below is a short program that demonstrates bugs that were found when
> porting a program to the HP.  I'm running HP-UX 6.0.1 and the same
> bugs occured under HP-UX 5.5.

The S300 people responsible for the C compiler have been notified.  This
bug will be fixed in some future release of HP-UX.  As a workaround, use
a temporary integer variable in the code, thus:

	main()
	{
		int	t1, t2;
		char	*a, *b, *c;
		float	f, g;

	# ifdef compbug
		/* this DOESN'T generate a compiler error */
		t1 = a - b;	t2 = a - c;
		if ((float) t1 * 10.0 < (float) t2)
			;
	# else /* assembug */
		/* this DOESN'T generate an assembler error */
		t1 = a - b;	t2 = a - c;
		if ((float) t1 * 10.0 < (float) (f = t2))
			;
	# endif
	}

N.B.: There is no bug in the assembler; in the second example given,
the compiler incorrectly generated the instruction fmov.l %a0,%fp0
which is an illegal instruction.

> Is there an e-mail place we can send
> bugs to, like Berkeley's 4bsd-bugs@Berkeley.EDU?

Not really.  Contact your service representative or sales rep. to report
bugs.  Sigh.  We could really use an e-mail address for bugs...

>	- Greg Couch
>	gregc@miro.Berkeley.EDU
>	gregc@Berkeley.EDU

				Ross Cunniff
				Hewlett-Packard ISD/UDL
				...{ucbvax,hplabs}!hpda!cunniff
				cunniff%hpda@hplabs.ARPA