#include <cfg/compiler.h>
#include <cpu/attr.h>
#include <cpu/detect.h>
+#include <cpu/types.h>
#include <cfg/macros.h>
/**
/* Avoid breaking strict aliasing rules. */
char *cx = (char *)(&x);
STATIC_ASSERT(sizeof(float) == 4);
- #define BYTEORDER_SWAP(a, b) ((a) ^= (b) ^= (a) ^= (b))
+ #define BYTEORDER_SWAP(a, b) do { (a) ^= (b); (b) ^= (a); (a) ^= (b); } while(0)
BYTEORDER_SWAP(cx[0], cx[3]);
BYTEORDER_SWAP(cx[1], cx[2]);
#undef BYTEORDER_SWAP
return be_float_to_cpu(x);
}
+#if CPU_ARM
+INLINE cpu_atomic_t
+cpu_atomic_xchg(volatile cpu_atomic_t *ptr, cpu_atomic_t val)
+{
+ cpu_atomic_t ret;
+
+ asm volatile(
+ "swp %0, %1, [%2]"
+
+ : "=&r" (ret)
+ : "r" (val), "r" (ptr)
+ : "memory", "cc");
+
+ return ret;
+}
+#else /* CPU_ARM */
+#include <cpu/irq.h>
+
+INLINE cpu_atomic_t
+cpu_atomic_xchg(volatile cpu_atomic_t *ptr, cpu_atomic_t val)
+{
+ cpu_atomic_t ret;
+
+ ATOMIC(
+ ret = *ptr;
+ *ptr = val;
+ );
+ return ret;
+}
+#endif /* CPU_ARM */
+
#ifdef __cplusplus
/// Type generic byte swapping.