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

Signed-off-by: Zebediah Figura <z.figura12@gmail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

include: Use __atomic_exchange_n() for InterlockedExchange*() if possible.
aabdaed1 · Zebediah Figura · Alexandre Julliard · dc02bbee · aabdaed1
Commit aabdaed1 authored Jan 18, 2021 by Zebediah Figura Committed by Alexandre Julliard Jan 20, 2021
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winnt.h include/winnt.h +6 -2

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--- 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" );