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added caveat about slowness

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svn: r17394
This commit is contained in:
Robby Findler 2009-12-24 18:37:02 +00:00
parent 3a127f04bd
commit fb6daf8c0c
1 changed files with 8 additions and 2 deletions
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10
collects/scribblings/reference/numbers.scrbl
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@ -961,7 +961,11 @@ first slot is position @scheme[0], and the last slot is one less than
The @schememodname[scheme/fixnum] library provides operations like
@scheme[fx+] that consume and produce only fixnums. The
operations in this library are meant to be safe versions of the
unsafe fixnum operations like @scheme[unsafe-fx+]. The expected
unsafe fixnum operations like @scheme[unsafe-fx+].
Note that these operations are slow, much slower than just using
the regular mzscheme primitives, e.g. @scheme[+], even just on
fixnums. The expected
usecase for this library to develop some code using it and then
to replace the @scheme[require] of @schememodname[scheme/fixnum]
with
@ -969,7 +973,9 @@ with
(λ (name) (and (regexp-match #rx"unsafe-" name)
(regexp-replace #rx"unsafe-" name "")))
scheme/unsafe/ops))]
to drop in this library's unsafe cousins.
to drop in this library's unsafe cousins or, if you find some crashing errors
in code that uses the unsafe functions, to use this library to help debug
the problems.
@(include-extracted (lib "fixnum.ss" "scheme"))