[ruby-core:39277] [Ruby 1.9 - Backport #5272] Float#round doesn't round big values

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Issue #5272 has been updated by Tomoyuki Chikanaga.


I've found that TestFloat#test_round fails after r33186 on i686-linux.

For (4294967295.8).round, 32bit version ruby returns 4294967295, while 64bit version(x86_64-linux) returns correctly 4294967296. It seems that when result value is Bignum Float#round works like floor().
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Backport #5272: Float#round doesn't round big values
http://redmine.ruby-lang.org/issues/5272

Author: Marc-Andre Lafortune
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 1.9.3


For large enough values (outside of Fixnum range), Float#round does not round at all but simply truncates:

  2.999999999999999e20.round(-20) # => 200000000000000000000

Fixed in trunk, but would be nice to backport for Ruby 1.9.3.



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