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(cmpxchg_ptr): Use a union to do the pointer-casting so that

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GCC knows it can't use ANSI-C aliasing rules.

(Logical change 1.155)
This commit is contained in:
mostang.com!davidm 2004-01-20 23:50:00 +00:00
parent a432debbe2
commit 82cfd4862f
1 changed files with 26 additions and 6 deletions
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32
include/internal.h
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@ -140,9 +140,19 @@ do { \
#ifdef HAVE_ATOMIC_OPS_H
# include <atomic_ops.h>
# define cmpxchg_ptr(_ptr,_o,_n) AO_compare_and_swap((AO_T *)_ptr, \
(AO_T) (_o), \
(AO_T) (_n))
static inline int
cmpxchg_ptr (void *addr, void *old, void *new)
{
union
{
void *vp;
AO_t *aop;
}
u;
u.vp = addr;
return AO_compare_and_swap(u.aop, (AO_t) old, (AO_t) new);
}
# define fetch_and_add1(_ptr) AO_fetch_and_add1(_ptr)
/* GCC 3.2.0 on HP-UX crashes on cmpxchg_ptr() */
# if !(defined(__hpux) && __GNUC__ == 3 && __GNUC_MINOR__ == 2)
@ -152,9 +162,19 @@ do { \
#else
# ifdef HAVE_IA64INTRIN_H
# include <ia64intrin.h>
# define cmpxchg_ptr(_ptr,_o,_n) \
(__sync_bool_compare_and_swap((volatile long *) (_ptr), \
(long) (_o), (long) (_n)))
static inline int
cmpxchg_ptr (void *addr, void *old, void *new)
{
union
{
void *vp;
long *vlp;
}
u;
u.vp = addr;
return __sync_bool_compare_and_swap(u.vlp, (long) old, (long) new);
}
# define fetch_and_add1(_ptr) __sync_fetch_and_add(_ptr, 1)
# define HAVE_CMPXCHG
# define HAVE_FETCH_AND_ADD1