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Hand code string to integer conversion for performance.

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As benchmarks show, using libc's string-to-integer conversion is
pretty slow. At least part of the reason for that is that strtol[l]
have to be more generic than what largely is required inside pg.

This patch considerably speeds up int2/int4 input (int8 already was
already using hand-rolled code).

Most of the existing pg_atoi callers have been converted. But as one
requires pg_atoi's custom delimiter functionality, and as it seems
likely that there's external pg_atoi users, it seems sensible to just
keep pg_atoi around.

Author: Andres Freund
Reviewed-By: Robert Haas
Discussion: https://postgr.es/m/20171208214437.qgn6zdltyq5hmjpk@alap3.anarazel.de
This commit is contained in:
Andres Freund
2018-07-22 14:58:01 -07:00
parent 3522d0eaba
commit 86eaf208ea
13 changed files with 176 additions and 25 deletions
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doc/src/sgml/sources.sgml
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@@ -709,7 +709,7 @@ BETTER: could not open file %s (I/O failure)
not helpful information. If the error text doesn't make as much sense
without the function name, reword it.
<programlisting>
BAD: pg_atoi: error in "z": cannot parse "z"
BAD: pg_strtoint32: error in "z": cannot parse "z"
BETTER: invalid input syntax for integer: "z"
</programlisting>
</para>