[Bug middle-end/37731] New: unsigned long long may not work correctly on 32bit host

[hjl dot tools at gmail dot com]

On Linux/ia32, gcc 4.4 gave:

[hjl@gnu-31 longlong-2]$ cat y.c
#include <stdio.h>

extern void abort ();

unsigned long long xh = 1ull;

int
main ()
{
  unsigned long long yh = 0xffffffffull;
  unsigned long long z = xh * yh;
  unsigned long long i = 1ull * yh;

  printf ("%llx\n", i);
  printf ("%llx\n", z);
  if (z != i)
    abort ();
}
[hjl@gnu-31 longlong-2]$ gcc -m32 -O y.c
[hjl@gnu-31 longlong-2]$ ./a.out 
ffffffff
ffffffffffffffff
Aborted
[hjl@gnu-31 longlong-2]$ 

On Linux/Intel64, I got

[hjl@gnu-6 longlong-2]$ gcc -m32 -O y.c
[hjl@gnu-6 longlong-2]$ ./a.out 
ffffffff
ffffffff
[hjl@gnu-6 longlong-2]$ 

On 32bit hosts, we didn't handle unsigned long long properly.


-- 
           Summary: unsigned long long may not work correctly on 32bit host
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl dot tools at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37731