On Sep 18, 2007, at 11:15 AM, Michael Sperber wrote: >> Also, is there a good reason for restricting the range of the second >> argument to be less than (fixnum-width)? > > Well, if that weren't there, you'd get an exception anyway, except for > 0, no?
No actually. First, the restriction on the range of the second argument is not sufficient to avoid exceptions. (fxarithmetic-shift -72736 17) should raise an exception even through |17| < (fixnum-width). Second, lifting the restriction on the range of the second argument does not imply that the result is not computable and is in the fixnum range. For example, (fxarithmetic-shift-right 1 100) could be made to return 0 instead of raising a "100 is not less than (fixnum-width)" error. Similarly, (fxarithmetic-shift-right -1 100) could return -1. Aziz,,, _______________________________________________ r6rs-discuss mailing list [email protected] http://lists.r6rs.org/cgi-bin/mailman/listinfo/r6rs-discuss
