JDK-8335392 : C2 MergeStores: enhanced pointer parsing
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 24
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2024-07-01
  • Updated: 2024-11-26
  • Resolved: 2024-11-05
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JDK 24
24 b23Fixed
Related Reports
Duplicate :  
JDK-8335113 - C2 MergeStores: allow merging of putChar and other larger stores on smaller array elements
Relates :  
JDK-8343536 - C2 SuperWord / MergeStores: investigate missing optimizations in MemorySegment examples
Relates :  
JDK-8343685 - C2 SuperWord: refactor VPointer with MemPointer
Relates :  
JDK-8345050 - Fix -Wzero-as-null-pointer warning in MemPointer ctor
Relates :  
JDK-8318446 - C2: optimize stores into primitive arrays by combining values into larger store
Relates :  
JDK-8335390 - C2 MergeStores: wrong result with Unsafe
Description
A pointer parser that can recognize more patterns, and not just supports arrays but also MemorySegments with native memory backing.

We should also allow larger stores into arrays with smaller elements: JDK-8335113
(e.g. putChar into byte-array, important for strings)
Comments
Changeset: f3671bee Branch: master Author: Emanuel Peter <epeter@openjdk.org> Date: 2024-11-05 11:46:40 +0000 URL: https://git.openjdk.org/jdk/commit/f3671beefb3ff07441a905e25619f0d1a0a2fe15
05-11-2024
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/19970 Date: 2024-07-01 13:32:01 +0000
17-10-2024