Re: Some regular-expression performance hacking

From: Andres Freund <andres(at)anarazel(dot)de>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: Re: Some regular-expression performance hacking
Date: 2021-02-23 17:34:37
Message-ID: 20210223173437.b3ywijygsy6q42gq@alap3.anarazel.de
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Hi,

One of the recent commits have introduce a new warning with gcc 10, when
building with optimizations:

In file included from /home/andres/src/postgresql/src/backend/regex/regcomp.c:2304:
/home/andres/src/postgresql/src/backend/regex/regc_nfa.c: In function ‘checkmatchall’:
/home/andres/src/postgresql/src/backend/regex/regc_nfa.c:3087:20: warning: array subscript -1 is outside array bounds of ‘_Bool[257]’ [-Warray-bounds]
3087 | hasmatch[depth] = true;
| ^
/home/andres/src/postgresql/src/backend/regex/regc_nfa.c:2920:8: note: while referencing ‘hasmatch’
2920 | bool hasmatch[DUPINF + 1];
| ^~~~~~~~

Greetings,

Andres Freund

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