[MATH-954] Faster implementation of FastMath.abs - ASF JIRA

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Details

Type: Improvement
Status: Closed
Priority: Minor
Resolution: Fixed
Affects Version/s: 3.1.1
Fix Version/s: 3.2
Component/s: None
Labels:
- optimization
- patch
Environment:

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java version "1.6.0_27"
OpenJDK Runtime Environment (IcedTea6 1.12.4) (6b27-1.12.4-1)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

Linux debian 3.2.0-4-amd64 #1 SMP Debian 3.2.39-2 x86_64 GNU/Linux

Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz

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java version "1.6.0_27" OpenJDK Runtime Environment (IcedTea6 1.12.4) (6b27-1.12.4-1) OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode) Linux debian 3.2.0-4-amd64 #1 SMP Debian 3.2.39-2 x86_64 GNU/Linux Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz

Description

Faster implementations of abs() which use bitwise operations in preference to branching. By my benchmark abs(double/float) are about 10-20% faster, and abs(long/int) more than twice as fast. Patch attached.

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patch
25/Mar/13 10:07
1 kB
Charles Cooper
patch
25/Mar/13 19:08
1 kB
Charles Cooper

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Assignee:: Unassigned

Reporter:: Charles Cooper

Votes:: 0 Vote for this issue

Watchers:: 2 Start watching this issue

Dates

Created:: 25/Mar/13 10:07

Updated:: 07/Apr/13 09:21

Resolved:: 26/Mar/13 14:57