add InterlockedExchangeAdd for olds gcc version

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@898 8ced0084-cf51-0410-be5f-012b33b47a6e

1 files changed, 6 insertions, 2 deletions

diff --git a/Source/Core/Common/Src/Thread.cpp b/Source/Core/Common/Src/Thread.cpp
index 7254caf539..95b5d1ca65 100644
--- a/Source/Core/Common/Src/Thread.cpp
+++ b/Source/Core/Common/Src/Thread.cpp
@@ -350,8 +350,12 @@ int InterlockedExchangeAdd(int *Addend, int Increment)
 #if defined(__GNUC__) && defined (__GNUC_MINOR__) && ((4 < __GNUC__) || (4 == __GNUC__ && 1 <= __GNUC_MINOR__))

   return  __sync_add_and_fetch(Addend, Increment);

 #else

-#error Sorry - GCC versions that does not support __sync_add_and_fetch are not supported.

-  // TODO support old gcc

+  register int result;

+  __asm__ __volatile__("lock; xadd %0,%1"

+                       : "=r" (result), "=m" (*Addend)

+                       : "0" (Increment), "m" (*Addend)

+                       : "memory");

+  return result + Increment;

 #endif

 }