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Date: Fri, 30 Nov 2012 15:51:37 -0800
Subject: [perl #115958] bigint rshift op is 1s complement, should be 2s 
complement
In-Reply-To: <pine.lnx.4.64.1211301828420.25...@sheavy.abrij.org>
References: <rt-ticket-115...@perl.org>
 <pine.lnx.4.64.1211301828420.25...@sheavy.abrij.org>
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# New Ticket Created by  "Brian S. Julin" 
# Please include the string:  [perl #115958]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=115958 >




Int should behave as a two's complement number with infinitely extended
sign bits, per spec.  As such -1 is an identity value for right shift,
as is 0.  Currently -1 +> 1 is 0 in rakudo, for example, where it should 
be -1.

A possible fix is at https://gist.github.com/4178797. It has not been 
roasted.

Test:
is (-4..-1 X+> 1..3), (-2,-1,-1,-2,-1 xx 8), "Right shift is two's complement"

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