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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 /include/asm-generic/bitops/arch_hweight.h
parent0fdf86754f70e813845af4abaa805165ce57a0bb (diff)
downloadlinux-linaro-stable-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 'include/asm-generic/bitops/arch_hweight.h')
-rw-r--r--include/asm-generic/bitops/arch_hweight.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/asm-generic/bitops/arch_hweight.h b/include/asm-generic/bitops/arch_hweight.h
new file mode 100644
index 000000000000..3a7be842cdce
--- /dev/null
+++ b/include/asm-generic/bitops/arch_hweight.h
@@ -0,0 +1,11 @@
+#ifndef _ASM_GENERIC_BITOPS_ARCH_HWEIGHT_H_
+#define _ASM_GENERIC_BITOPS_ARCH_HWEIGHT_H_
+
+#include <asm/types.h>
+
+extern unsigned int __arch_hweight32(unsigned int w);
+extern unsigned int __arch_hweight16(unsigned int w);
+extern unsigned int __arch_hweight8(unsigned int w);
+extern unsigned long __arch_hweight64(__u64 w);
+
+#endif /* _ASM_GENERIC_BITOPS_HWEIGHT_H_ */