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remove unused SCM_FENCE definition

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* libguile/__scm.h (SCM_FENCE): Remove unused definition.
This commit is contained in:
Andy Wingo 2011-05-15 13:22:25 +02:00
parent 27c6ebcb16
commit 6dae2c589b
1 changed files with 0 additions and 23 deletions
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23
libguile/__scm.h
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@ -390,29 +390,6 @@ typedef long SCM_STACKITEM;
#define SCM_STACK_PTR(ptr) ((SCM_STACKITEM *) (void *) (ptr))
/* Anthony Green writes:
When the compiler sees...
DEFER_INTS;
[critical code here]
ALLOW_INTS;
...it doesn't actually promise to keep the critical code within the
boundries of the DEFER/ALLOW_INTS instructions. It may very well
schedule it outside of the magic defined in those macros.
However, GCC's volatile asm feature forms a barrier over which code is
never moved. So if you add...
asm ("");
...to each of the DEFER_INTS and ALLOW_INTS macros, the critical
code will always remain in place. asm's without inputs or outputs
are implicitly volatile. */
#ifdef __GNUC__
#define SCM_FENCE asm /* volatile */ ("")
#elif defined (__INTEL_COMPILER) && defined (__ia64)
#define SCM_FENCE __memory_barrier()
#else
#define SCM_FENCE
#endif
#ifdef BUILDING_LIBGUILE
#define SCM_TICK SCM_ASYNC_TICK
#else