$((1<<64)) = 1

[Paul Jarc]

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DSHELL -DHAVE_CONFIG_H  -I. 
-I/package/misc/spf/bash-2.05b-4/spf/readline/include -I. -I./include -I./lib 
-I/nil -I/package/misc/spf/bash-2.05b-4/spf/readline/include 
-I/package/misc/spf/bash-2.05b-4/spf/ncurses/include -O2 -pipe
uname output: Linux multivac.cwru.edu 2.4.23 #1 SMP Mon Dec 1 17:11:18 EST 2003 
i686 unknown unknown GNU/Linux
Machine Type: i686-pc-linux-gnu

Bash Version: 2.05b
Patch Level: 0
Release Status: release

Description:
I would expect that $((1<<n == 2**n)) for all n, but apparently this
is not true for n>=64.  Bug?

Repeat-By:
$ echo $((1<<63)); echo $((2**63))
-9223372036854775808
-9223372036854775808
$ echo $((1<<64)); echo $((2**64))
1
0
$ echo $((1<<65)); echo $((2**65))
2
0
$ echo $((1<<66)); echo $((2**66))
4
0


paul