Add implementations of some MSVC intrinsics
Adds an implementation for _InterlockedCompareExchangePointer() and
__faststorefence().
Patch by David Ziman!
llvm-svn: 200239
diff --git a/clang/lib/Headers/Intrin.h b/clang/lib/Headers/Intrin.h
index fda38a2..11486a3 100644
--- a/clang/lib/Headers/Intrin.h
+++ b/clang/lib/Headers/Intrin.h
@@ -307,6 +307,7 @@
void __addgsdword(unsigned long, unsigned long);
void __addgsqword(unsigned long, unsigned __int64);
void __addgsword(unsigned long, unsigned short);
+static __inline__
void __faststorefence(void);
void __incgsbyte(unsigned long);
void __incgsdword(unsigned long);
@@ -394,6 +395,7 @@
__int64);
__int64 _InterlockedCompareExchange64_np(__int64 volatile *_Destination,
__int64 _Exchange, __int64 _Comparand);
+static __inline__
void *_InterlockedCompareExchangePointer(void *volatile *_Destination,
void *_Exchange, void *_Comparand);
void *_InterlockedCompareExchangePointer_np(void *volatile *_Destination,
@@ -791,6 +793,14 @@
return _Comparand;
}
#ifdef __x86_64__
+static __inline__ void *__attribute__((__always_inline__, __nodebug__))
+_InterlockedCompareExchangePointer(void *volatile *_Destination,
+ void *_Exchange, void *_Comparand) {
+ __atomic_compare_exchange(_Destination, &_Comparand, &_Exchange, 0, 0, 0);
+ return _Comparand;
+}
+#endif
+#ifdef __x86_64__
static __inline__ __int64 __attribute__((__always_inline__, __nodebug__))
_InterlockedCompareExchange64(__int64 volatile *_Destination,
__int64 _Exchange, __int64 _Comparand) {
@@ -816,6 +826,12 @@
_WriteBarrier(void) {
__asm__ volatile ("" : : : "memory");
}
+#ifdef __x86_64__
+static __inline__ void __attribute__((__always_inline__, __nodebug__))
+__faststorefence(void) {
+ __asm__ volatile("lock orq $0, (%%rsp)" : : : "memory");
+}
+#endif
/*----------------------------------------------------------------------------*\
|* readfs
|* (Pointers in address space #257 are relative to the FS segment register.)