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Slightly reorganize command line options help.

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Bruno Haible
2003-01-29 12:31:42 +00:00
parent f54d310530
commit 3aff1fd64f
4 changed files with 27 additions and 18 deletions
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22
doc/gperf.texi
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@@ -683,6 +683,17 @@ test like @samp{c >= 'A' && c <= 'Z'} guarantees this.) This was the
default in versions of @code{gperf} earlier than 2.7; now the default is
to support 8-bit and multibyte characters.
@item -l
@itemx --compare-strlen
Compare keyword lengths before trying a string comparison. This option
is mandatory for binary comparisons (@pxref{Binary Strings}). It also might
cut down on the number of string comparisons made during the lookup, since
keywords with different lengths are never compared via @code{strcmp}.
However, using @samp{-l} might greatly increase the size of the
generated C code if the lookup table range is large (which implies that
the switch option @samp{-S} is not enabled), since the length table
contains as many elements as there are entries in the lookup table.
@item -c
@itemx --compare-strncmp
Generates C code that uses the @code{strncmp} function to perform
@@ -767,17 +778,6 @@ with length less than the indicated byte positions work properly, since
selected byte positions exceeding the keyword length are simply not
referenced in the hash function.
@item -l
@itemx --compare-strlen
Compare keyword lengths before trying a string comparison. This might cut
down on the number of string comparisons made during the lookup, since
keywords with different lengths are never compared via @code{strcmp}.
However, using @samp{-l} might greatly increase the size of the
generated C code if the lookup table range is large (which implies that
the switch option @samp{-S} is not enabled), since the length table
contains as many elements as there are entries in the lookup table.
This option is mandatory for binary comparisons (@pxref{Binary Strings}).
@item -D
@itemx --duplicates
@cindex Duplicates