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util/u_atomic: Add _InterlockedExchangeAdd8/16 for older MSVC.

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We need to build certain parts of Mesa (namely gallium, llvmpipe, and
therefore util) with Windows SDK 7.0.7600, which includes MSVC 2008.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Jose Fonseca
2015-02-11 15:30:39 +00:00
parent d2438f5920
commit 531d47baa8
1 changed files with 33 additions and 4 deletions
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src/util/u_atomic.h
+33 -4
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@@ -88,9 +88,9 @@
#if _MSC_VER < 1600
/* Implement _InterlockedCompareExchange8 in terms of InterlockedCompareExchange16 */
static __inline
char _InterlockedCompareExchange8(char volatile *Destination8, char Exchange8, char Comparand8)
/* Implement _InterlockedCompareExchange8 in terms of _InterlockedCompareExchange16 */
static __inline char
_InterlockedCompareExchange8(char volatile *Destination8, char Exchange8, char Comparand8)
{
INT_PTR DestinationAddr = (INT_PTR)Destination8;
short volatile *Destination16 = (short volatile *)(DestinationAddr & ~1);
@@ -103,7 +103,7 @@ char _InterlockedCompareExchange8(char volatile *Destination8, char Exchange8, c
* neighboring byte untouched */
short Exchange16 = (Initial16 & ~Mask8) | ((short)Exchange8 << Shift8);
short Comparand16 = Initial16;
short Initial16 = InterlockedCompareExchange16(Destination16, Exchange16, Comparand16);
short Initial16 = _InterlockedCompareExchange16(Destination16, Exchange16, Comparand16);
if (Initial16 == Comparand16) {
/* succeeded */
return Comparand8;
@@ -114,6 +114,35 @@ char _InterlockedCompareExchange8(char volatile *Destination8, char Exchange8, c
return Initial8;
}
/* Implement _InterlockedExchangeAdd16 in terms of _InterlockedCompareExchange16 */
static __inline short
_InterlockedExchangeAdd16(short volatile *Addend, short Value)
{
short Initial = *Addend;
short Comparand;
do {
short Exchange = Initial + Value;
Comparand = Initial;
/* if *Addend==Comparand then *Addend=Exchange, return original *Addend */
Initial = _InterlockedCompareExchange16(Addend, Exchange, Comparand);
} while(Initial != Comparand);
return Comparand;
}
/* Implement _InterlockedExchangeAdd8 in terms of _InterlockedCompareExchange8 */
static __inline char
_InterlockedExchangeAdd8(char volatile *Addend, char Value)
{
char Initial = *Addend;
char Comparand;
do {
char Exchange = Initial + Value;
Comparand = Initial;
Initial = _InterlockedCompareExchange8(Addend, Exchange, Comparand);
} while(Initial != Comparand);
return Comparand;
}
#endif /* _MSC_VER < 1600 */
/* MSVC supports decltype keyword, but it's only supported on C++ and doesn't