JDK-8253524 : C2: Refactor code that clones predicates during loop unswitching
- Type: Enhancement
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 11,16
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2020-09-23
- Updated: 2024-11-22
- Resolved: 2020-09-24
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| JDK 11 | JDK 16 |
|---|---|
| 11.0.11-oracleFixed | 16 b18Fixed  |
Description
During unswitching PhaseIdealLoop::create_slow_version_of_loop() calls PhaseIdealLoop::clone_predicates_to_unswitched_loop() twice, one for each loops, to clone some predicates above each loop. That code is fragile as it (implicitly) requires the fast loop to be processed first. I propose calling PhaseIdealLoop::clone_predicates_to_unswitched_loop() a single time and have it handle both loops in a single pass.
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