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Re: [Fwd: [PATCH] arithmetic -> logical shift]


From: Pádraig Brady
Subject: Re: [Fwd: [PATCH] arithmetic -> logical shift]
Date: Tue, 21 Oct 2008 12:10:30 +0100
User-agent: Thunderbird 2.0.0.6 (X11/20071008)

Chet Ramey wrote:
> Pádraig Brady wrote:
>> -------- Original Message --------
>> Date: Tue, 07 Oct 2008 11:55:51 +0100
>> From: Pádraig Brady <address@hidden>
>> To: Chet Ramey <address@hidden>
>> CC: address@hidden
>>
>> I was just discussing bit shifting with Tim Hockin using shell
>> arithmetic expansion, and he pointed out that bash and ksh
>> use arithmetic rather than logical shift for the >> operator.
> 
> Actually, bash and ksh use whatever the native C compiler implements,
> since both just translate the >> and << into the same operators
> internally.
> 
> I don't see a really compelling reason to change, since, as you say,
> the standard requires signed long ints.

Well that means the result is compiler dependent.
So scripts could give different results on another
platform, or less often within a platform.

Also arithmetic right shift is not useful.

Pádraig.





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