From: | Michael Paquier <michael(at)paquier(dot)xyz> |
---|---|
To: | Postgres hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Cc: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> |
Subject: | Failures with gcd functions with GCC snapshots GCC and -O3 (?) |
Date: | 2021-06-03 07:26:49 |
Message-ID: | YLiEOVpTg/7gxEVM@paquier.xyz |
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Lists: | pgsql-hackers |
Hi all,
serinus has been complaining about the new gcd functions in 13~:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=serinus&dt=2021-06-03%2003%3A44%3A14
The overflow detection is going wrong the way up and down, like here:
SELECT gcd((-9223372036854775808)::int8, (-9223372036854775808)::int8); -- overflow
-ERROR: bigint out of range
+ gcd
+----------------------
+ -9223372036854775808
+(1 row)
That seems like a compiler bug to me as this host uses recent GCC
snapshots, and I cannot see a problem in GCC 10.2 on my own dev box.
But perhaps I am missing something?
Thanks,
--
Michael
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