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authorAlexander van Heukelum <heukelum@mailshack.com>2008-03-15 13:31:49 -0400
committerIngo Molnar <mingo@elte.hu>2008-04-26 13:21:16 -0400
commit56a6b1eb7bfb5ace0b5cb9c149f502fbd101b8ab (patch)
tree46d3781050938b0649fc89cd8e7f612cacb66984 /include/asm-powerpc
parent7d9dff22e8ad06ad330968c9e3d3a2fb55a5f9c3 (diff)
generic: implement __fls on all 64-bit archs
Implement __fls on all 64-bit archs: alpha has an implementation of fls64. Added __fls(x) = fls64(x) - 1. ia64 has fls, but not __fls. Added __fls based on code of fls. mips and powerpc have __ilog2, which is the same as __fls. Added __fls = __ilog2. parisc, s390, sh and sparc64: Include generic __fls. x86_64 already has __fls. Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-powerpc')
-rw-r--r--include/asm-powerpc/bitops.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/asm-powerpc/bitops.h b/include/asm-powerpc/bitops.h
index a99a74929475..897eade3afbe 100644
--- a/include/asm-powerpc/bitops.h
+++ b/include/asm-powerpc/bitops.h
@@ -313,6 +313,11 @@ static __inline__ int fls(unsigned int x)
313 return 32 - lz; 313 return 32 - lz;
314} 314}
315 315
316static __inline__ unsigned long __fls(unsigned long x)
317{
318 return __ilog2(x);
319}
320
316/* 321/*
317 * 64-bit can do this using one cntlzd (count leading zeroes doubleword) 322 * 64-bit can do this using one cntlzd (count leading zeroes doubleword)
318 * instruction; for 32-bit we use the generic version, which does two 323 * instruction; for 32-bit we use the generic version, which does two