1 files changed, 12 insertions, 0 deletions
diff --git a/lldb/source/Plugins/Process/Utility/ARMUtils.h b/lldb/source/Plugins/Process/Utility/ARMUtils.h
index 5b10b31b2f3..137acb40d48 100644
--- a/lldb/source/Plugins/Process/Utility/ARMUtils.h
+++ b/lldb/source/Plugins/Process/Utility/ARMUtils.h
@@ -18,6 +18,18 @@ namespace lldb_private {
 // not permitted for many Thumb register specifiers.
 static inline bool BadReg(uint32_t n) { return n == 13 || n == 15; }
 
+// Returns an integer result equal to the number of bits of x that are ones.
+static inline uint32_t BitCount(uint32_t x)
+{
+    // c accumulates the total bits set in x
+    uint32_t c;
+    for (c = 0; x; ++c)
+    {
+        x &= x - 1; // clear the least significant bit set
+    }
+    return c;
+}
+
 }   // namespace lldb_private
 
 #endif  // lldb_ARMUtils_h_