This site is a static rendering of the Trac instance that was used by R7RS-WG1 for its work on R7RS-small (PDF), which was ratified in 2013. For more information, see Home.

Source for wiki FixnumInfo version 2

author

aag

comment

Started a list of ranges for 64-bit Schemes by adding MIT Scheme.

ipnr

216.239.44.65

name

FixnumInfo

readonly

text

This is the range of fixnums in bits for the 32-bit builds of 39 Schemes.   For this purpose, an exact integer ''n'' is a fixnum if ''n'' satisfies the implementation's `fixnum?` procedure (marked by an asterisk) or if there is no such procedure, then if `(eq `''n''` `''n''`)` returns `#t`.

31 bits: Racket*, Chicken*, Ypsilon*, Elk

30 bits: Gambit* , Scheme48/scsh, Guile, Chibi, Chez*, SCM, Ikarus*/Vicare*, Larceny*, Ypsilon*, Mosh*, !IronScheme* (but see below), STklos*, RScheme*, Oaklisp*

29 bits: Gauche*, Bigloo*, !SigScheme

26 bits: MIT*

16 bits: Owl Lisp*

9 bits: Scheme 7

No fixnums (even `(eq? 0 0)` is `#f`): SISC, KSi, !TinyScheme, Scheme 9, Dream, BDC, UMB

Apparently unbounded fixnums: Shoe, Schemik, VX

Answer not easily determined: NexJ, XLisp, rep


In Kawa and !IronScheme all exact integers are boxed, but a short range is preallocated, so that `eq?` is satisfied: -100 to 1024 for Kawa, -100 to 999 for !IronScheme.

For 64-bit Schemes:

55 bits: MIT*

time

2012-03-01 06:21:54