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bitops: unify bitops_ffsl with the one in host-utils.h, call it bitops_ctzl

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We had two copies of a ffs function for longs with subtly different
semantics and, for the one in bitops.h, a confusing name: the result
was off-by-one compared to the library function ffsl.

Unify the functions into one, and solve the name problem by calling
the 0-based functions "bitops_ctzl" and "bitops_ctol" respectively.

This also fixes the build on platforms with ffsl, including Mac OS X
and Windows.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Tested-by: Andreas Färber <afaerber@suse.de>
Tested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Paolo Bonzini 2013-02-01 23:03:16 +01:00 • committed by Blue Swirl
parent 7b2d977981
commit fbeadf50f2
6 changed files with 28 additions and 65 deletions
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4
util/bitops.c
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@ -60,7 +60,7 @@ found_first:
return result + size; /* Nope. */
}
found_middle:
return result + bitops_ffsl(tmp);
return result + bitops_ctzl(tmp);
}
/*
@ -109,7 +109,7 @@ found_first:
return result + size; /* Nope. */
}
found_middle:
return result + ffz(tmp);
return result + bitops_ctol(tmp);
}
unsigned long find_last_bit(const unsigned long *addr, unsigned long size)