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Introduce new alpha_inc pass, to avoid artificial duplicates.

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Bruno Haible
2003-02-17 10:36:47 +00:00
parent 799d1c7534
commit ec800f65ec
11 changed files with 970 additions and 686 deletions
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doc/gperf.texi
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@@ -993,7 +993,7 @@ through a search that minimizes the number of byte positions.
@itemx --duplicates
@cindex Duplicates
Handle keywords whose selected byte sets hash to duplicate values.
Duplicate hash values can occur for three reasons:
Duplicate hash values can occur for two reasons:
@itemize @bullet
@item
@@ -1003,15 +1003,6 @@ However, frequently only a very small number of duplicates occur, and
the majority of keywords still require one probe into the table. To
overcome this problem, the option @samp{-m 50} should be used.
@item
Since the @code{gperf} generated hash function treats the bytes at
different byte positions with equal weight, keywords that are permutations
of each other can lead to the same hash function value if they are not
disambiguated by the set of selected byte positions. Sometimes even this
is not possible; for example, the keyword set @{"xy", "yx", "xz", "zx"@}
will always lead to duplicates, regardless how the selected byte positions
are chosen. You can use the option @samp{-D} to handle this rare case.
@item
Sometimes a set of keywords may have the same names, but possess different
attributes. With the -D option @code{gperf} treats all these keywords as