On Sun, Jan 01, 2012 at 08:26:11PM +0000, Ed Schouten wrote: > Author: ed > Date: Sun Jan 1 20:26:11 2012 > New Revision: 229198 > URL: http://svn.freebsd.org/changeset/base/229198 > > Log: > Introducing memcchr(3). > > It seems two of the file system drivers we have in the tree, namely ufs > and ext3, use a function called `skpc()'. The meaning of this function > does not seem to be documented in FreeBSD, but it turns out one needs to > be a VAX programmer to understand what it does. > > SPKC is an instruction on the VAX that does the opposite of memchr(). It > searches for the non-equal character. Add a new function called > memcchr() to the tree that has the following advantages over skpc(): > > - It has a name that makes more sense than skpc(). Just like strcspn() > matches the complement of strspn(), memcchr() is the complement of > memchr(). > > - It is faster than skpc(). Similar to our strlen() in libc, it compares > entire words, instead of single bytes. It seems that for this routine > this yields a sixfold performance increase on amd64. > > - It has a man page. > > Added: > head/share/man/man9/memcchr.3 (contents, props changed)
Shouldn't this be memcchr.9? -- Pawel Jakub Dawidek http://www.wheelsystems.com FreeBSD committer http://www.FreeBSD.org Am I Evil? Yes, I Am! http://yomoli.com
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