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Upstream-Status: Backport
8/17/2010 - rebased to 1.44 by Qing He <qing.he@intel.com>
diff --git a/boost/smart_ptr/detail/atomic_count_sync.hpp b/boost/smart_ptr/detail/atomic_count_sync.hpp
index b6359b5..78b1cc2 100644
--- a/boost/smart_ptr/detail/atomic_count_sync.hpp
+++ b/boost/smart_ptr/detail/atomic_count_sync.hpp
@@ -33,17 +33,46 @@ public:
long operator++()
{
+#ifdef __ARM_ARCH_7A__
+ int v1, tmp;
+ asm volatile ("1: \n\t"
+ "ldrex %0, %1 \n\t"
+ "add %0 ,%0, #1 \n\t"
+ "strex %2, %0, %1 \n\t"
+ "cmp %2, #0 \n\t"
+ "bne 1b \n\t"
+ : "=&r" (v1), "+Q"(value_), "=&r"(tmp)
+ );
+#else
return __sync_add_and_fetch( &value_, 1 );
+#endif
}
long operator--()
{
+#ifdef __ARM_ARCH_7A__
+ int v1, tmp;
+ asm volatile ("1: \n\t"
+ "ldrex %0, %1 \n\t"
+ "sub %0 ,%0, #1 \n\t"
+ "strex %2, %0, %1 \n\t"
+ "cmp %2, #0 \n\t"
+ "bne 1b \n\t"
+ : "=&r" (v1), "+Q"(value_), "=&r"(tmp)
+ );
+ return value_;
+#else
return __sync_add_and_fetch( &value_, -1 );
+#endif
}
operator long() const
{
+#if __ARM_ARCH_7A__
+ return value_;
+#else
return __sync_fetch_and_add( &value_, 0 );
+#endif
}
private:
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