From: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
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To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
Subject: | pgsql: Optimise numeric division for 3 and 4 base-NBASE digit divisors. |
Date: | 2023-01-23 12:00:25 |
Message-ID: | E1pJvUu-0053zr-O4@gemulon.postgresql.org |
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Lists: | pgsql-committers |
Optimise numeric division for 3 and 4 base-NBASE digit divisors.
On platforms with 128-bit integer support, introduce a new function
div_var_int64(), along the same lines as div_var_int() added in
d1b307eef2 for divisors with 1 or 2 base-NBASE digits, and use it to
speed up div_var() and div_var_fast() in a similar way when the
divisor has 3 or 4 base-NBASE digits.
This gives significant performance gains for divisors with 9-16
decimal digits.
Joel Jacobson.
Discussion:
https://postgr.es/m/b7a5893d-af18-4c0b-8918-96de5f1bbf39%40app.fastmail.com
https://postgr.es/m/CAEZATCXGm%3DDyTq%3DFrcOqC0gPMVveKUYTaD5KRRoajrUTiWxVMw%40mail.gmail.com
Branch
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master
Details
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https://git.postgresql.org/pg/commitdiff/0aa38db56bf459d04ed58c22f7c689c0ae14e977
Modified Files
--------------
src/backend/utils/adt/numeric.c | 167 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 167 insertions(+)
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