Zebediah Figura : include: Use __atomic_exchange_n() for InterlockedExchange*() if possible.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: aabdaed10211fd5d6e7399c95b25a1a2bde3c7e6
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=aabdaed10211fd5d6e7399c95...

Author: Zebediah Figura 
Date:   Mon Jan 18 21:55:01 2021 -0600

include: Use __atomic_exchange_n() for InterlockedExchange*() if possible.

Signed-off-by: Zebediah Figura 
Signed-off-by: Alexandre Julliard

---

include/winnt.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/winnt.h b/include/winnt.h
index e48c884cd4c..8abc11a7dd5 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -7015,7 +7015,9 @@ static FORCEINLINE unsigned char InterlockedCompareExchange128( volatile __int64
 static FORCEINLINE LONG WINAPI InterlockedExchange( LONG volatile *dest, LONG val )
 {
     LONG ret;
-#if defined(__i386__) || defined(__x86_64__)
+#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7))
+    ret = __atomic_exchange_n( dest, val, __ATOMIC_SEQ_CST );
+#elif defined(__i386__) || defined(__x86_64__)
     __asm__ __volatile__( "lock; xchgl %0,(%1)"
                           : "=r" (ret) :"r" (dest), "0" (val) : "memory" );
 #else
@@ -7042,7 +7044,9 @@ static FORCEINLINE LONG WINAPI InterlockedDecrement( LONG volatile *dest )
 static FORCEINLINE void * WINAPI InterlockedExchangePointer( void *volatile *dest, void *val )
 {
     void *ret;
-#ifdef __x86_64__
+#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7))
+    ret = __atomic_exchange_n( dest, val, __ATOMIC_SEQ_CST );
+#elif defined(__x86_64__)
     __asm__ __volatile__( "lock; xchgq %0,(%1)" : "=r" (ret) :"r" (dest), "0" (val) : "memory" );
 #elif defined(__i386__)
     __asm__ __volatile__( "lock; xchgl %0,(%1)" : "=r" (ret) :"r" (dest), "0" (val) : "memory" );