Message-ID: <3ba9dde0-ed11-2b58-5ede-b95d00e64228@gmail.com>
Date: Thu, 14 Dec 2023 14:11:12 +0300
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.4.2
Subject: Re: BUG #18248: Expression is always zero
Content-Language: en-US
To: rekgrpth@gmail.com, pgsql-bugs@lists.postgresql.org
References: <18248-4250c882e2a8b8f6@postgresql.org>
From: Alexander Lakhin <exclusion@gmail.com>
In-Reply-To: <18248-4250c882e2a8b8f6@postgresql.org>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Archived-At: 
 <https://www.postgresql.org/message-id/3ba9dde0-ed11-2b58-5ede-b95d00e64228%40gmail.com>
Precedence: bulk

Hello Georgy,

14.12.2023 08:32, PG Bug reporting form wrote:
> The following bug has been logged on the website:
>
> Bug reference:      18248
> Logged by:          RekGRpth
> Email address:      rekgrpth@gmail.com
>
> The value of expression 'thistimecnt >> 31 >> 31 >> 2' (in
> src/timezone/zic.c) is zero regardless of the value of the left operand
> 'thistimecnt', because it is shifted by 64 (in total) bits, which is greater
> or equal to its size of 64 bits.
>
> Maybe this was what was meant?
> thistimecnt >> 31 >> 2

I see the same in
https://github.com/eggert/tz/blob/main/zic.c

So maybe you would like to report that to the tz mailing list?:
https://www.iana.org/time-zones

Best regards,
Alexander