Implement the ffsll based on built-in function "__builtin_ffsll()"
ffsll will return one plus the index of the least significant 1-bit in
doublewords or if doublewords is zero, returns zero.
Signed-off-by: Rahul Singh <rahul.si...@arm.com>
---
Changes in V4:
- This patch is introduce in this verison.
---
xen/include/asm-arm/bitops.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/xen/include/asm-arm/bitops.h b/xen/include/asm-arm/bitops.h
index 71ae14cab3..7f83ee1828 100644
--- a/xen/include/asm-arm/bitops.h
+++ b/xen/include/asm-arm/bitops.h
@@ -170,6 +170,18 @@ static inline unsigned int find_first_set_bit(unsigned
long word)
return ffsl(word) - 1;
}
+/**
+ * ffsll - find the first least significant set bit
+ * @doubleword: double word to search
+ *
+ * Returns one plus the index of the least significant 1-bit in @doubleword
+ * or if doubleword is zero, returns zero.
+ */
+static inline int ffsll(long long doubleword)
+{
+ return __builtin_ffsll(doubleword);
+}
+
/**
* hweightN - returns the hamming weight of a N-bit word
* @x: the word to weigh
--
2.17.1
