[lworld] Integrated: 8376778: [lworld] Ideal verification fails with "Need to remove from hash before changing edges" for various tests

[Benoît Maillard]

On Thu, 19 Feb 2026 12:22:57 GMT, Benoît Maillard <bmaillard at openjdk.org> wrote:

> This PR addresses several missed optimizations linked to `InlineType` nodes. These failures were originally caught during testing in `compiler/valhalla/inlinetypes/TestArrays.java` and `compiler/valhalla/inlinetypes/TestNullableInlineTypes.java`. I noticed there were two distinct cases in these tests and extracted reproducers.
> 
> The first case is a missed notification in `add_users_of_use_to_worklist` when we have nested `InlineType` nodes and we want to use the base oop if fields are loaded from memory. Since the structure might be nested, we need to add all the users in a recursive fashion.
> 
> The other case happens when we call `InlineTypeNode::buffer` during parsing. In `InlineTypeNode::Ideal`, we search re-allocation of an inlintype and attempt to remove them. Since this optimization hides behind the `can_reshape` flag, we need to make sure that the node gets added to the worklist after calling `PhaseGVN::transform`.
> 
> ### Testing
> - [x] GitHub Actions
> - [x] tier1-3, plus some internal testing
> 
> Thank you for reviewing!

This pull request has now been integrated.

Changeset: 7b3ac63d
Author:    Benoît Maillard <bmaillard at openjdk.org>
Committer: Tobias Hartmann <thartmann at openjdk.org>
URL:       https://git.openjdk.org/valhalla/commit/7b3ac63d269acc338a9e7b2fb680e023c0455dfb
Stats:     194 lines in 5 files changed: 181 ins; 0 del; 13 mod

8376778: [lworld] Ideal verification fails with "Need to remove from hash before changing edges" for various tests

Reviewed-by: thartmann

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PR: https://git.openjdk.org/valhalla/pull/2135