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Article contents:[[tags: manual]] [[toc:]] == Module (chicken fixnum) Because CHICKEN supports a full numeric tower, operations can sometimes incur a substantial overhead to simply detect the type of numbers you're passing in. When you know you're definitely dealing only with fixnums, you can choose to use fixnum-specific operations to avoid this overhead. This is purely a performance hack. You might want to consider adding [[Types|type annotations]] instead, this often gives the same performance boost without having to rewrite all numeric operators in your code. === Arithmetic fixnum operations <procedure>(fx+ N1 N2)</procedure> <procedure>(fx- N1 N2)</procedure> <procedure>(fx* N1 N2)</procedure> <procedure>(fx/ N1 N2)</procedure> <procedure>(fxmod N1 N2)</procedure> <procedure>(fxrem N1 N2)</procedure> <procedure>(fxneg N)</procedure> <procedure>(fxmin N1 N2)</procedure> <procedure>(fxmax N1 N2)</procedure> <procedure>(fxand N1 N2)</procedure> <procedure>(fxior N1 N2)</procedure> <procedure>(fxxor N1 N2)</procedure> <procedure>(fxnot N)</procedure> <procedure>(fxshl N1 N2)</procedure> <procedure>(fxshr N1 N2)</procedure> <procedure>(fxgcd N1 N2)</procedure> {{fx+}} and friends are arithmetic fixnum operations. These procedures do not check their arguments, so non-fixnum parameters will result in incorrect results. {{fxneg}} negates its argument. On division by zero, {{fx/}}, {{fxmod}} and {{fxrem}} signal a condition of kind {{(exn arithmetic)}}. {{fxshl}} and {{fxshr}} perform arithmetic shift left and right, respectively. === Overflow-aware fixnum operations <procedure>(fx+? N1 N2)</procedure> <procedure>(fx-? N1 N2)</procedure> <procedure>(fx*? N1 N2)</procedure> <procedure>(fx/? N1 N2)</procedure> These procedures behave similarly to their standard counterparts with the exception that {{#f}} is returned if an argument is not a fixnum or the result of the operation overflows. Chaining of such procedures is well-defined and causes the overflow error to be propagated. === Fixnum comparison and predicates <procedure>(fxodd? N)</procedure> <procedure>(fxeven? N)</procedure> <procedure>(fx= N1 N2)</procedure> <procedure>(fx> N1 N2)</procedure> <procedure>(fx< N1 N2)</procedure> <procedure>(fx>= N1 N2)</procedure> <procedure>(fx<= N1 N2)</procedure> Comparison of fixnums and predicates on them. === Fixnum limits <constant>most-positive-fixnum</constant><br> <constant>most-negative-fixnum</constant><br> <constant>fixnum-bits</constant><br> <constant>fixnum-precision</constant><br> Platform-specific fixnum limits. --- Previous: [[Module (chicken file posix)]] Next: [[Module (chicken flonum)]] Description of your changes:

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