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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-02-01 15:03:07 +0100
committerH. Peter Anvin <hpa@zytor.com>2010-04-06 15:52:11 -0700
commit1527bc8b928dd1399c3d3467dd47d9ede210978a (patch)
treefb391da915bdae9f933b8170ff61aa43c85ef9ae /arch/ia64/include/asm/bitops.h
parent0fdf86754f70e813845af4abaa805165ce57a0bb (diff)
downloadop-kernel-dev-1527bc8b928dd1399c3d3467dd47d9ede210978a.zip
op-kernel-dev-1527bc8b928dd1399c3d3467dd47d9ede210978a.tar.gz
bitops: Optimize hweight() by making use of compile-time evaluation
Rename the extisting runtime hweight() implementations to __arch_hweight(), rename the compile-time versions to __const_hweight() and then have hweight() pick between them. Suggested-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20100318111929.GB11152@aftab> Acked-by: H. Peter Anvin <hpa@zytor.com> LKML-Reference: <1265028224.24455.154.camel@laptop> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/ia64/include/asm/bitops.h')
-rw-r--r--arch/ia64/include/asm/bitops.h11
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/ia64/include/asm/bitops.h b/arch/ia64/include/asm/bitops.h
index 6ebc229..9da3df6 100644
--- a/arch/ia64/include/asm/bitops.h
+++ b/arch/ia64/include/asm/bitops.h
@@ -437,17 +437,18 @@ __fls (unsigned long x)
* hweightN: returns the hamming weight (i.e. the number
* of bits set) of a N-bit word
*/
-static __inline__ unsigned long
-hweight64 (unsigned long x)
+static __inline__ unsigned long __arch_hweight64(unsigned long x)
{
unsigned long result;
result = ia64_popcnt(x);
return result;
}
-#define hweight32(x) (unsigned int) hweight64((x) & 0xfffffffful)
-#define hweight16(x) (unsigned int) hweight64((x) & 0xfffful)
-#define hweight8(x) (unsigned int) hweight64((x) & 0xfful)
+#define __arch_hweight32(x) ((unsigned int) __arch_hweight64((x) & 0xfffffffful))
+#define __arch_hweight16(x) ((unsigned int) __arch_hweight64((x) & 0xfffful))
+#define __arch_hweight8(x) ((unsigned int) __arch_hweight64((x) & 0xfful))
+
+#include <asm-generic/bitops/const_hweight.h>
#endif /* __KERNEL__ */
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