glide2x, h3,minihwc: add p6fence stuff for linux, gcc & co.

glide2x/h3/minihwc/minihwc.c

@@ -447,11 +447,9 @@ static char errorString[1024];
 static int num_monitor = 0;
 static FxU32 __attribute_used fenceVar;
 
-
-#if defined(__WATCOMC__)
 /*
  *  P6 Fence
- * 
+ *
  *  Here's the stuff to do P6 Fencing.  This is required for the
  *  certain things on the P6
  *
@@ -459,18 +457,24 @@ static FxU32 __attribute_used fenceVar;
  * This was yoinked from sst1/include/sst1init.h, and should be
  * merged back into something if we decide that we need it later.
  */
-void 
-p6Fence(void);
+#if defined(__WATCOMC__)
+void p6Fence(void);
 #pragma aux p6Fence = \
-"xchg eax, fenceVar" \
-modify [eax];
-
-
+ "xchg eax, fenceVar" \
+ modify [eax];
 #define P6FENCE p6Fence()
 #elif defined(__MSC__)
 #define P6FENCE {_asm xchg eax, fenceVar}
 #elif defined(__POWERPC__) && defined(__MWERKS__)
 #define P6FENCE __eieio()
+#elif defined(__DJGPP__) || defined (__MINGW32__)
+#define P6FENCE __asm __volatile ("xchg %%eax, _fenceVar":::"%eax")
+#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+#define P6FENCE __asm __volatile ("xchg %%eax, fenceVar":::"%eax")
+#elif defined(__GNUC__) && defined(__ia64__)
+# define P6FENCE asm volatile ("mf.a" ::: "memory");
+#elif defined(__GNUC__) && defined(__alpha__)
+# define P6FENCE asm volatile("mb" ::: "memory");
 #else
 #error "P6 Fencing in-line assembler code needs to be added for this compiler"
 #endif /* Compiler specific fence commands */