[heap] HoH: Use lower bits for GCInfoIndex [v8/v8 : main]
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Michael Lippautz (Gerrit)
Dec 2, 2025, 6:57:20 AM (6 days ago) Dec 2
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Michael Lippautz (Gerrit)
Dec 3, 2025, 6:47:03 AM (5 days ago) Dec 3
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Omer Katz (Gerrit)
Dec 3, 2025, 6:49:22 AM (5 days ago) Dec 3
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Michael Lippautz (Gerrit)
Dec 3, 2025, 6:52:03 AM (5 days ago) Dec 3
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V8 LUCI CQ (Gerrit)
Dec 3, 2025, 6:53:24 AM (5 days ago) Dec 3
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Change information
Commit message:
[heap] HoH: Use lower bits for GCInfoIndex
The GCInfoIndex is always written on allocation. This does not affect
writing/reading the construction bit which happens with a mask.
This safes one shift in the allocation fast path (for GCInfoIndex).
Drive-by: Use std::atomic_ref instead of casts to std::atomic.
Change-Id: I8932f46ef582558d30eded9bab9b8d210a0ee1cb
Auto-Submit: Michael Lippautz <mlip...@chromium.org>
Commit-Queue: Michael Lippautz <mlip...@chromium.org>
Reviewed-by: Omer Katz <omer...@chromium.org>
Cr-Commit-Position: refs/heads/main@{#104077}
Files:
- M include/cppgc/allocation.h
- M include/cppgc/internal/api-constants.h
- M src/heap/cppgc/heap-object-header.h
Change size: S
Delta: 3 files changed, 13 insertions(+), 14 deletions(-)
Branch: refs/heads/main
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Code-Review: +1 by Omer Katz
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