Steven D'Aprano added the comment: On Thu, Jul 02, 2015 at 05:35:53PM +0000, Tim Peters wrote: > Steven, there's something wrong with the arithmetic on your machine, > but I can't guess what from here (perhaps you have a non-standard > rounding mode enabled, perhaps your CPU is broken, ...).
It's not just me. Others have confirmed the same behaviour, but only on 32-bit Linux: https://mail.python.org/pipermail/python-list/2015-July/693481.html Thread begins here: https://mail.python.org/pipermail/python-list/2015-July/693457.html > For a start, is it the multiplication that's broken on your machine, or the > int() part? Looks like multiplication: >>> x = 1.-2.**-53 >>> assert x.hex() == '0x1.fffffffffffffp-1' >>> assert (2049.0).hex() == '0x1.0020000000000p+11' >>> (x*2049.0).hex() # Should be '0x1.001ffffffffffp+11' '0x1.0020000000000p+11' I'd like to see what result the OP gets if he runs this. Serge is using Linux, but if I'm reading it right, it looks like a 64-bit Linux. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue24546> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
