Blackfin: add optimized version of Hamming Weight functions
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 3bd8e83..b483639 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -45,9 +45,6 @@
config GENERIC_FIND_NEXT_BIT
def_bool y
-config GENERIC_HWEIGHT
- def_bool y
-
config GENERIC_HARDIRQS
def_bool y
diff --git a/arch/blackfin/include/asm/bitops.h b/arch/blackfin/include/asm/bitops.h
index a2ff3fb..605ba8e 100644
--- a/arch/blackfin/include/asm/bitops.h
+++ b/arch/blackfin/include/asm/bitops.h
@@ -7,22 +7,41 @@
#ifndef _BLACKFIN_BITOPS_H
#define _BLACKFIN_BITOPS_H
-#ifndef CONFIG_SMP
-# include <asm-generic/bitops.h>
-#else
+#include <linux/compiler.h>
+
+#include <asm-generic/bitops/__ffs.h>
+#include <asm-generic/bitops/ffz.h>
+#include <asm-generic/bitops/fls.h>
+#include <asm-generic/bitops/__fls.h>
+#include <asm-generic/bitops/fls64.h>
+#include <asm-generic/bitops/find.h>
#ifndef _LINUX_BITOPS_H
#error only <linux/bitops.h> can be included directly
#endif
-#include <linux/compiler.h>
-#include <asm/byteorder.h> /* swab32 */
-
-#include <asm-generic/bitops/ffs.h>
-#include <asm-generic/bitops/__ffs.h>
#include <asm-generic/bitops/sched.h>
-#include <asm-generic/bitops/ffz.h>
+#include <asm-generic/bitops/ffs.h>
+#include <asm-generic/bitops/lock.h>
+#include <asm-generic/bitops/ext2-non-atomic.h>
+#include <asm-generic/bitops/ext2-atomic.h>
+#include <asm-generic/bitops/minix.h>
+#ifndef CONFIG_SMP
+#include <linux/irqflags.h>
+
+/*
+ * clear_bit may not imply a memory barrier
+ */
+#ifndef smp_mb__before_clear_bit
+#define smp_mb__before_clear_bit() smp_mb()
+#define smp_mb__after_clear_bit() smp_mb()
+#endif
+#include <asm-generic/bitops/atomic.h>
+#include <asm-generic/bitops/non-atomic.h>
+#else
+
+#include <asm/byteorder.h> /* swab32 */
#include <linux/linkage.h>
asmlinkage int __raw_bit_set_asm(volatile unsigned long *addr, int nr);
@@ -89,19 +108,36 @@
#include <asm-generic/bitops/non-atomic.h>
-#include <asm-generic/bitops/find.h>
-#include <asm-generic/bitops/hweight.h>
-#include <asm-generic/bitops/lock.h>
-
-#include <asm-generic/bitops/ext2-atomic.h>
-#include <asm-generic/bitops/ext2-non-atomic.h>
-
-#include <asm-generic/bitops/minix.h>
-
-#include <asm-generic/bitops/fls.h>
-#include <asm-generic/bitops/__fls.h>
-#include <asm-generic/bitops/fls64.h>
-
#endif /* CONFIG_SMP */
+/*
+ * hweightN: returns the hamming weight (i.e. the number
+ * of bits set) of a N-bit word
+ */
+
+static inline unsigned int hweight32(unsigned int w)
+{
+ unsigned int res;
+
+ __asm__ ("%0.l = ONES %0;"
+ "%0 = %0.l (Z);"
+ : "=d" (res) : "d" (w));
+ return res;
+}
+
+static inline unsigned int hweight64(__u64 w)
+{
+ return hweight32((unsigned int)(w >> 32)) + hweight32((unsigned int)w);
+}
+
+static inline unsigned int hweight16(unsigned int w)
+{
+ return hweight32(w & 0xffff);
+}
+
+static inline unsigned int hweight8(unsigned int w)
+{
+ return hweight32(w & 0xff);
+}
+
#endif /* _BLACKFIN_BITOPS_H */