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Source for wiki FixnumInfo version 4

author

aag

comment

Fixed fixnum range for 64-bit MIT Scheme.  There was a bug in EXPT that caused it to use bignums instead of fixnums at the edge.

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72.14.225.65

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FixnumInfo

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= Fixnum ranges for 32-bit Schemes =

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/GNU Scheme*||
||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.

= Fixnum ranges for 64-bit Schemes =

||58 bits||MIT/GNU Scheme*||

time

2012-03-03 03:43:06