[sir_richard] 49782: [NTOS]: Fix 16-bit interlocked operations on ARM (GCC doesn't provide built-ins). ARM should build now.

Author: sir_richard
Date: Wed Nov 24 18:19:42 2010
New Revision: 49782

URL: http://svn.reactos.org/svn/reactos?rev=49782&view=rev
Log:
[NTOS]: Fix 16-bit interlocked operations on ARM (GCC doesn't provide built-ins). ARM
should build now.

Modified:
    trunk/reactos/include/crt/mingw32/intrin_arm.h

Modified: trunk/reactos/include/crt/mingw32/intrin_arm.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/include/crt/mingw32/intrin…
==============================================================================
--- trunk/reactos/include/crt/mingw32/intrin_arm.h [iso-8859-1] (original)
+++ trunk/reactos/include/crt/mingw32/intrin_arm.h [iso-8859-1] Wed Nov 24 18:19:42 2010
@@ -67,12 +67,40 @@
 
 __INTRIN_INLINE short _InterlockedCompareExchange16(volatile short * const Destination,
const short Exchange, const short Comperand)
 {
-	return __sync_val_compare_and_swap(Destination, Comperand, Exchange);
-}
-
-__INTRIN_INLINE long _InterlockedExchangeAdd16(volatile short * const Addend, const short
Value)
-{
-	return __sync_fetch_and_add(Addend, Value);
+	short a, b;
+
+	__asm__ __volatile__ (    "0:\n\t"
+                          "ldr %1, [%2]\n\t"
+                          "cmp %1, %4\n\t"
+                          "bne 1f\n\t"
+                          "swp %0, %3, [%2]\n\t"
+                          "cmp %0, %1\n\t"
+                          "swpne %3, %0, [%2]\n\t"
+                          "bne 0b\n\t"
+                          "1:"
+                          : "=&r" (a), "=&r" (b)
+                          : "r" (Destination), "r" (Exchange),
"r" (Comperand)
+                          : "cc", "memory");
+
+	return a;
+}
+
+__INTRIN_INLINE short _InterlockedExchangeAdd16(volatile short * const Addend, const
short Value)
+{
+	short a, b, c;
+
+	__asm__ __volatile__ (  "0:\n\t"
+                          "ldr %0, [%3]\n\t"
+                          "add %1, %0, %4\n\t"
+                          "swp %2, %1, [%3]\n\t"
+                          "cmp %0, %2\n\t"
+                          "swpne %1, %2, [%3]\n\t"
+                          "bne 0b"
+                          : "=&r" (a), "=&r" (b),
"=&r" (c)
+                          : "r" (Value), "r" (Addend)
+                          : "cc", "memory");
+
+	return a;
 }
 
 __INTRIN_INLINE long _InterlockedCompareExchange(volatile long * const dest, const long
exch, const long comp)