JDK-8346174 : UMAX/UMIN are missing from XXXVector::reductionOperations
  • Type: Bug
  • Component: core-libs
  • Affected Version: 24
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2024-12-13
  • Updated: 2025-12-03
  • Resolved: 2024-12-16
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JDK 24 JDK 25
24Fixed 25 b03Fixed
Related Reports
Causes :  
JDK-8372978 - [VectorAPI] Fix incorrect identity values in UMIN/UMAX reductions
Causes :  
JDK-8358767 - [vectorapi] UMIN and UMAX reduction have incorrect identity value
Relates :  
JDK-8338021 - Support new unsigned and saturating vector operators in VectorAPI
Description
https://github.com/openjdk/jdk/blob/367c3041272d43b0474b433c555f22a3e15579f6/src/jdk.incubator.vector/share/classes/jdk/incubator/vector/IntVector.java#L2846

This method misses UMAX/UMIN, which means calling reduceLanes with them will throw UnsupportedOperationException
Comments
A pull request was submitted for review. Branch: jdk24 URL: https://git.openjdk.org/jdk/pull/22777 Date: 2024-12-17 00:08:10 +0000
17-12-2024
Changeset: 31c3b191 Branch: master Author: Paul Sandoz <psandoz@openjdk.org> Date: 2024-12-16 18:53:05 +0000 URL: https://git.openjdk.org/jdk/commit/31c3b191745b5c97ae4e757323355fb9831da9fe
16-12-2024
Fix Request: avoids possible crash in C2 and enables intended functionality when operators are used for reduction.
16-12-2024
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/22741 Date: 2024-12-13 18:42:27 +0000
13-12-2024
[~qmai] stated this to be the cause.
13-12-2024