Integrated: 8327147: Improve performance of Math ceil, floor, and rint for x86

Thu Mar 7 21:47:57 UTC 2024

On Fri, 1 Mar 2024 19:11:58 GMT, Srinivas Vamsi Parasa <duke at openjdk.org> wrote:

> The goal of this PR is to provide ~4x faster implementation of Math.ceil, Math.floor and Math.rint for x86_64 CPUs.
> 
> Below is the performance data on an Intel Tiger Lake machine. 
> 
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> <meta name=ProgId content=Excel.Sheet>
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> 
> Benchmark   (UseAVX=3) | Stock JDK   (ops/ms) | This PR (ops/ms) | Speedup
> -- | -- | -- | --
> MathBench.ceilDouble | 547979 | 2170198 | 3.96
> MathBench.floorDouble | 547979 | 2167459 | 3.96
> MathBench.rintDouble | 547962 | 2130499 | 3.89
> MathBench.addCeilFloorDouble | 501366 | 1754260 | 3.50
> 
> 
> 
> </body>
> 
> </html>
> 
> <html xmlns:v="urn:schemas-microsoft-com:vml"
> xmlns:o="urn:schemas-microsoft-com:office:office"
> xmlns:x="urn:schemas-microsoft-com:office:excel"
> xmlns="http://www.w3.org/TR/REC-html40">
> 
> <head>
> 
> <meta name=ProgId content=Excel.Sheet>
> <meta name=Generator content="Microsoft Excel 15">
> <link id=Main-File rel=Main-File
> href="file:///C:/Users/sparasa/AppData/Local/Temp/msohtmlclip1/01/clip.htm">
> <link rel=File-List
> href="file:///C:/Users/sparasa/AppData/Local/Temp/msohtmlclip1/01/clip_filelist.xml">
> 
> 
> 
> </head>
> 
> <body link="#0563C1" vlink="#954F72">
> 
> 
> Benchmark   (UseAVX=0) | Stock JDK   (ops/ms) | This PR (ops/ms) | Speedup
> -- | -- | -- | --
> MathBench.ceilDouble | 548492 | 2193497 | 4.00
> MathBench.floorDouble | 548485 | 2192813 | 4.00
> MathBench.rintDouble | 548488 | 2192578 | 4.00
> MathBench.addCeilFloorDouble | 501761 | 1644714 | 3.28
> 
> 
> 
> </body>
> 
> </html>

This pull request has now been integrated.

Changeset: 7c5e6e74
Author:    vamsi-parasa <srinivas.vamsi.parasa at intel.com>
Committer: Sandhya Viswanathan <sviswanathan at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/7c5e6e74c8f559be919cea63ebf7004cda80ae75
Stats:     20 lines in 3 files changed: 8 ins; 11 del; 1 mod

8327147: Improve performance of Math ceil, floor, and rint for x86

Reviewed-by: jbhateja, sviswanathan, dlong

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PR: https://git.openjdk.org/jdk/pull/18089