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Type: Enhancement
Resolution: Duplicate
Priority: P4
Fix Version/s: tbd
Affects Version/s: 21
Component/s: hotspot
Labels:
- c2
- c2-superword

Subcomponent:
compiler

Platforms with alignment requirement do not need to have alignment modulo vector_width, that is too restrictive. It prevents vectorization of some simple conversion tests. Platforms often only require 4-byte or 8-byte alignment.

This is more relevant after ~~JDK-8298935~~ (where we disable "resurrecting" rejected memops). This prevents certain conversion-tests to fail under +AlignVector. For example some tests in TestVectorizeTypeConversion.java.

duplicates

JDK-8310190 C2 SuperWord: AlignVector is broken, generates misaligned packs

Resolved

is blocked by

JDK-8298935 fix independence bug in create_pack logic in SuperWord::find_adjacent_refs

Resolved

relates to

JDK-8305055 IR check fails on some aarch64 platforms

Resolved

JDK-8310190 C2 SuperWord: AlignVector is broken, generates misaligned packs

Resolved

Assignee:: Emanuel Peter

Reporter:: Emanuel Peter

Votes:: 0 Vote for this issue

Watchers:: 2 Start watching this issue

Created:: 2023-03-08 08:56

Updated:: 2024-01-11 02:36

Resolved:: 2024-01-11 02:36

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