c/9348: error in int to unsigned long multiplication on hp

[balpreet.singh@adelantetech.com]

>Number:         9348
>Category:       c
>Synopsis:       error in int to unsigned long multiplication on hp
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 17 02:36:00 PST 2003
>Closed-Date:
>Last-Modified:
>Originator:     Balpreet Singh
>Release:        3.2.1
>Organization:
>Environment:

>Description:
multiplication of int/long values converted to unsigned long long generates wrong results.

compile the following code with gcc...

ll.c
<<
#include <stdio.h>

#define u_l_l unsigned long long
#define l_l long long

l_l mpy_res;

u_l_l mpy (long a, long b)
{
   return  (u_l_l) a * (u_l_l) b;
}
<<EOF
 
int main(void)
{
   mpy_res = mpy(1,-1);
   printf("dec %lld\n hex %llx\n want %llx\n", (l_l) mpy_res, (l_l) mpy_res, -1LL);
}

$>gcc ll.c
$>a.out
dec 8589934591
hex 1ffffffff
want ffffffffffffffff
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: