gregc@miro.Berkeley.EDU (Greg Couch) (04/05/88)
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. Is there an e-mail place we can send
bugs to, like Berkeley's 4bsd-bugs@Berkeley.EDU?
- Greg Couch
gregc@miro.Berkeley.EDU
gregc@Berkeley.EDU
-----
main()
{
char *a, *b, *c;
float f, g;
# ifdef compbug
/* this generates a compiler error */
if ((float) (a - b) * 10.0 < (float) (a - c))
;
# else /* assembug */
/* this generates an assembler error */
if ((float) (a - b) * 10.0 < (float) (f = (a - c)))
;
# endif
}cunniff@hpfclq.HP.COM (Ross Cunniff) (04/06/88)
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
kk@hpl-opus.HP.COM (Konstantinos Konstantinides) (04/07/88)
According to the HP-UX Software Release/Status Bulletin
for HP 9000 Series 200/300 Computers, August 1987,
HP Part Number 97005-90010, this seems to be a known bug (page 23)
From the bulletin:
The following line doesn't compile
x[1] = x[2] < x[3]; /* x is an array of doubles */
Temporary solution:
Add an additional assignement between the comparison and the original
assignement.
x[1] = (double) (i=(x[2] < x[3])); /* is is an integer */
For your program the following seems to work:
f= (float) (a-b);
g = (float) (a-c);
if (f*10. <g)
;
The above Bulletin has instructions, forms and addresses for submitting bugs
(no e-mail address is mentioned). For the USA the addresses are
National Response Center
Hewlett-Packard
3300 Scott Blvd.
Santa Clara, CA 95051
or
1765 The Exchange Suite 100
Atlanta, GA 30339
See that Bulletin for addresses in Europe and Australia.
------------------------------------------------
Although I am working for HP this is not an official response,
but I hope that it helps.
K. Konstantinides kk%hpkronos@hplabs.hp.com