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SCP: Asynch I/O avoid interlocked instruction on Intel sim_asynch_queue read

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This commit is contained in:
Mark Pizzolato
2024-01-14 13:15:12 -10:00
parent c42efce080
commit 24081206a8
1 changed files with 10 additions and 4 deletions
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14
sim_scp_private.h
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@@ -265,16 +265,22 @@ extern int32 sim_asynch_inst_latency;
} while (0)
#ifdef _WIN32
#elif defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) || defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8)
#define InterlockedCompareExchangePointer(Destination, Exchange, Comparand) __sync_val_compare_and_swap(Destination, Comparand, Exchange)
#define InterlockedCompareExchangePointerAcquire(Destination, Exchange, Comparand) __sync_val_compare_and_swap(Destination, Comparand, Exchange)
#define InterlockedCompareExchangePointerRelease(Destination, Exchange, Comparand) __sync_val_compare_and_swap(Destination, Comparand, Exchange)
#elif defined(__DECC_VER)
#define InterlockedCompareExchangePointer(Destination, Exchange, Comparand) (void *)((int32)_InterlockedCompareExchange64(Destination, Exchange, Comparand))
#define InterlockedCompareExchangePointerAcquire(Destination, Exchange, Comparand) (void *)((int32)_InterlockedCompareExchange64(Destination, Exchange, Comparand))
#define InterlockedCompareExchangePointerRelease(Destination, Exchange, Comparand) (void *)((int32)_InterlockedCompareExchange64(Destination, Exchange, Comparand))
#else
#error "Implementation of function InterlockedCompareExchangePointer() is needed to build with USE_AIO_INTRINSICS"
#endif
#define AIO_ILOCK AIO_LOCK
#define AIO_IUNLOCK AIO_UNLOCK
#define AIO_QUEUE_VAL (UNIT *)(InterlockedCompareExchangePointer((void * volatile *)&sim_asynch_queue, (void *)sim_asynch_queue, NULL))
#define AIO_QUEUE_SET(newval, oldval) (UNIT *)(InterlockedCompareExchangePointer((void * volatile *)&sim_asynch_queue, (void *)newval, oldval))
#if defined(_M_IX86) || defined(_M_X64)
#define AIO_QUEUE_VAL ((UNIT *)sim_asynch_queue)
#else /* !defined(_M_IX86) || defined(_M_X64) */
#define AIO_QUEUE_VAL (UNIT *)(InterlockedCompareExchangePointerAcquire((void * volatile *)&sim_asynch_queue, (void *)sim_asynch_queue, NULL))
#endif /* defined(_M_IX86) || defined(_M_X64) */
#define AIO_QUEUE_SET(newval, oldval) ((UNIT *)(InterlockedCompareExchangePointerRelease((void * volatile *)&sim_asynch_queue, (void *)newval, oldval)))
#define AIO_UPDATE_QUEUE sim_aio_update_queue ()
#define AIO_ACTIVATE(caller, uptr, event_time) \
if (!pthread_equal ( pthread_self(), sim_asynch_main_threadid )) { \