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[PATCH V3 05/29] Add ia64-specific parity functions

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  [PATCH V3 05/29] Add ia64-specific parity functions zengzhaoxiu@163.com - 2016-04-14 05:10 +0200

#1378424 — [PATCH V3 05/29] Add ia64-specific parity functions

From: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>

Signed-off-by: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>
---
 arch/ia64/include/asm/bitops.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/ia64/include/asm/bitops.h b/arch/ia64/include/asm/bitops.h
index 71e8145..041d1d6 100644
--- a/arch/ia64/include/asm/bitops.h
+++ b/arch/ia64/include/asm/bitops.h
@@ -439,6 +439,37 @@ static __inline__ unsigned long __arch_hweight64(unsigned long x)
 
 #include <asm-generic/bitops/const_hweight.h>
 
+/*
+ * parityN: returns the parity of a N-bit word,
+ * i.e. the number of 1-bits in x modulo 2.
+ */
+static __inline__ unsigned int __arch_parity64(unsigned long x)
+{
+	return (unsigned int)ia64_popcnt(x) & 1;
+}
+
+static __inline__ unsigned int __arch_parity32(unsigned int x)
+{
+	return __arch_parity64((unsigned long)x << 32);
+}
+
+static __inline__ unsigned int __arch_parity16(unsigned int x)
+{
+	return __arch_parity64((unsigned long)x << 48);
+}
+
+static __inline__ unsigned int __arch_parity8(unsigned int x)
+{
+	return __arch_parity64((unsigned long)x << 56);
+}
+
+static __inline__ unsigned int __arch_parity4(unsigned int x)
+{
+	return __arch_parity64((unsigned long)x << 60);
+}
+
+#include <asm-generic/bitops/const_parity.h>
+
 #endif /* __KERNEL__ */
 
 #include <asm-generic/bitops/find.h>
-- 
2.5.0

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