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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: 24
Affects Version/s: 23, 24
Component/s: hotspot
Labels:
- c2
- c2-superword

Subcomponent:
compiler
Resolved In Build:
b02

SuperWord::memory_alignment
computes offsets modulo vector_width:
int off_rem = offset % vw;

This is an artefact of the old AlignVector mechanism, to avoid packing over alignment boundaries.

TODO find examples where this made a difference.

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patch_JDK-8309267.diff
2024-02-06 01:55
14 kB
Emanuel Peter

is blocked by

JDK-8330819 C2 SuperWord: bad dominance after pre-loop limit adjustment with base that has CastLL after pre-loop

Resolved

JDK-8331764 C2 SuperWord: refactor _align_to_ref/_mem_ref_for_main_loop_alignment

Resolved

relates to

JDK-8334431 C2 SuperWord: fix performance regression due to store-to-load-forwarding failures

Resolved

JDK-8333876 C2 SuperWord: regression after JDK-8325155: failed: internal connection

Resolved

JDK-8334083 C2 SuperWord: TestCompatibleUseDefTypeSize.java fails with -XX:+AlignVector after JDK-8325155

Resolved

links to

Commit openjdk/jdk/944aeb81

Review openjdk/jdk/18822

(2 links to)

Assignee:: Emanuel Peter

Reporter:: Emanuel Peter

Votes:: 0 Vote for this issue

Watchers:: 5 Start watching this issue

Created:: 2024-02-02 00:01

Updated:: 2024-06-20 11:05

Resolved:: 2024-06-06 22:03

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