Add functions to count trailing zero bits in a word.
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Add functions to count trailing zero bits in a word.

* cipher/bithelp.h (_gcry_ctz, _gcry_ctz64): New.
* configure.ac (HAVE_BUILTIN_CTZ): Add new test.

Note that these functions return the number of bits in the word when
passing 0.

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• werner

Authored on Jan 15 2015, 10:04 AM

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rC27a91a93d101: Re-indent types.h for easier reading.

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