JDK-8352418 : Add verification code to check that the associated loop nodes of useless Template Assertion Predicates are dead
  • Type: Sub-task
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 25
  • Priority: P4
  • Status: In Progress
  • Resolution: Unresolved
  • Submitted: 2025-03-19
  • Updated: 2025-03-31
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tbdUnresolved
Related Reports
Blocks :  
JDK-8350577 - Fix missing Assertion Predicates when splitting loops
Relates :  
JDK-8350579 - Remove Template Assertion Predicates belonging to a loop once it is folded away
Description
As a follow up to JDK-8350579, we should add verification code to check the following: The associated loop nodes of all newly marked useless Template Assertion Predicates during PhaseIdealLoop::eliminate_useless_predicates() should not exist in the graph anymore. 

We could walk through all OpaqueTemplateAssertionPredicate nodes and collect the loop nodes of the useless ones. Then we walk through the loop tree and verify that no loop node can be found on this list.

I actually wanted to add this with JDK-8350579 but we require the fixes from JDK-8350577 to make this reliably working.
Comments
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/24326 Date: 2025-03-31 12:28:59 +0000
31-03-2025