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-rw-r--r--include/rtthread.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/rtthread.h b/include/rtthread.h
index a87515907e..08c57f5810 100644
--- a/include/rtthread.h
+++ b/include/rtthread.h
@@ -809,6 +809,7 @@ rt_device_t rt_console_get_device(void);
#endif /* RT_USING_THREADSAFE_PRINTF */
#endif /* defined(RT_USING_DEVICE) && defined(RT_USING_CONSOLE) */
+int __rt_fls(int val);
int __rt_ffs(int value);
unsigned long __rt_ffsl(unsigned long value);
unsigned long __rt_clz(unsigned long value);