| From: | "Joel Jacobson" <joel(at)compiler(dot)org> |
|---|---|
| To: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Optimize numeric multiplication for one and two base-NBASE digit multiplicands. |
| Date: | 2024-07-01 06:04:06 |
| Message-ID: | 44d2ffca-d560-4919-b85a-4d07060946aa@app.fastmail.com |
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| Lists: | pgsql-hackers |
Hello hackers,
Attached patch introduces an optimization of mul_var() in numeric.c, targeting cases where the multiplicands consist of only one or two base-NBASE digits. Such small multiplicands can fit into an int64 and thus be computed directly, resulting in a significant performance improvement, between 26% - 34% benchmarked on Intel Core i9-14900K.
This optimization is similar to commit d1b307eef2, that also targeted one and two base-NBASE digit operands, but optimized div_var().
Regards,
Joel
| Attachment | Content-Type | Size |
|---|---|---|
| 0001-optimize-numeric-mul_var-small-factors.patch | application/octet-stream | 1.8 KB |
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