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Type: Bug
Resolution: Unresolved
Priority: P3
Fix Version/s: 26
Affects Version/s: 11, 17, 25
Component/s: hotspot
Labels:

Subcomponent:
compiler

compiler/stringopts/TestStackedConcatsAppendUncommonTrap.java fails with a wrong result after stacked string concatenation optimizations when run with stress flags.

-Xcomp -XX:CompileThreshold=100 -XX:-TieredCompilation -XX:+DeoptimizeALot

These flags inline 'f' into the main method which is OSR compiled in the failure case (and maybe they avoid the uncommon trap that ~~JDK-8357105~~ was caused by).

This bug is hidden by ~~JDK-8273612~~ since JDK 18, but to my understanding, that fix should not affect correctness, only inlining decisions for the -Xcomp mode.

===

The test runs fine before ~~JDK-8271341~~, then starts crashing until ~~JDK-8291775~~, and after that it produces the wrong result. The failure mode looks similar to ~~JDK-7179138~~ since in both cases a result with the wrong length is produced.

caused by

JDK-8291775 C2: assert(r != __null && r->is_Region()) failed: this phi must have a region

Resolved

relates to

JDK-8271341 Opcode() != Op_If && Opcode() != Op_RangeCheck) || outcnt() == 2 assert failure with Test7179138_1.java

Resolved

JDK-8273612 Fix for JDK-8272873 causes timeout in running some tests with -Xcomp

Resolved

JDK-8357105 C2: compilation fails with "assert(false) failed: empty program detected during loop optimization"

Resolved

JDK-7179138 Incorrect result with String concatenation optimization

Closed

JDK-8362118 C2: add more debug prints to string concatenation optimizations

Open

(1 relates to)

Assignee:: Daniel Skantz

Reporter:: Daniel Skantz

Votes:: 0 Vote for this issue

Watchers:: 2 Start watching this issue

Created:: Yesterday 23:11

Updated:: 14 hours ago

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