[Bug target/21097] New: __sync_bool_compare_and_swap doesn't work with -m32

[Bug target/21097] New: __sync_bool_compare_and_swap doesn't work with -m32

[hjl at lucon dot org]

[hjl@gnu-9 gcc]$ cat /tmp/x.c
#include <stdio.h>

#ifdef OLD
extern int __sync_bool_compare_and_swap_di (long *, long, long);
#else
#define __sync_bool_compare_and_swap_di __sync_bool_compare_and_swap
#endif

int
foo (long *x)
{
  long address = *x;
  if (!__sync_bool_compare_and_swap_di (x, address, (address | 1)))
    return 0;
  else
    return 1;
}

int
main ()
{
  long val = 0;
  int ret;
  printf ("val: 0x%lx\n", val);
  ret = foo (&val);
  printf ("ret: %d: val: 0x%lx\n", ret, val);
  return;
}
[hjl@gnu-9 gcc]$ ./xgcc -B./ -O2 /tmp/x.c
[hjl@gnu-9 gcc]$ ./a.out
val: 0x0
ret: 1: val: 0x1
[hjl@gnu-9 gcc]$ ./xgcc -B./ -O2 /tmp/x.c -m32
/tmp/ccQy8ACO.o: In function `foo':
x.c:(.text+0x1c): undefined reference to `__sync_bool_compare_and_swap_4'
collect2: ld returned 1 exit status

-- 
           Summary: __sync_bool_compare_and_swap doesn't work with -m32
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl at lucon dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21097

[Bug target/21097] __sync_bool_compare_and_swap doesn't work with -m32

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21097

[Bug target/21097] __sync_bool_compare_and_swap doesn't work with -m32

[rth at gcc dot gnu dot org]

------- Additional Comments From rth at gcc dot gnu dot org  2005-04-19 16:21 -------
When, exactly, did you think that cmpxchg was added?  Use -march=i486.  Duh.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21097

[Bug target/21097] __sync_bool_compare_and_swap doesn't work with -m32

[hjl at lucon dot org]

------- Additional Comments From hjl at lucon dot org  2005-04-19 16:28 -------
But there is no __sync_bool_compare_and_swap_4 in source code.
If it isn't available, shouldn't gcc leave __sync_bool_compare_and_swap
alone.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21097

[Bug target/21097] __sync_bool_compare_and_swap doesn't work with -m32

[rth at gcc dot gnu dot org]

------- Additional Comments From rth at gcc dot gnu dot org  2005-04-19 19:34 -------
No, because __sync_bool_compare_and_swap is overloaded.
This expansion to __sync_bool_compare_and_swap_N is documented.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21097