On 2013-01-16 12:47:46 +0100, Mischa Baars wrote: > On 01/16/2013 12:07 PM, Andrew Haley wrote: > >Comparisons with NaN don't terminate a statement, and they don't > >return a NaN. They return a boolean. > They shouldn't return anything, the comparison should be terminated.
This depends on the comparison and the context. You have quiet and signaling comparisons. != and == are quiet comparisons: they never generate an exception on quiet NaN operands. <, <=, >=, > are signaling comparisons: they generate an exception on quiet NaN operands; but the comparison will be interrupted only if you trap the invalid operation exception. -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <http://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)