JDK-8203215 : IdealLoopTree::split_outer_loop leaves phi-nodes with only one input
- Type: Bug
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 11
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2018-05-15
- Updated: 2018-05-30
- Resolved: 2018-05-17
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| JDK 11 |
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11 b15Fixed  |
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Description
IdealLoopTree::split_outer_loop leaves behind phi-nodes with only one input. When moving phis to outer loops, it needs to register the old_phis for transform, so that we can get rid of them. These phis will otherwise keep pinning other ops to a loop. This issue was reproduced in the ZGC repo running SPECjvm98/mpegaudio compiling "spec.benchmarks._222_mpegaudio.p::g"
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