JDK-8213473 : Replace testB_mem_imm matcher with testUB_mem_imm
- Type: Enhancement
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 12
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: generic
- Submitted: 2018-11-07
- Updated: 2019-10-12
- Resolved: 2018-11-09
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| JDK 12 |
|---|
12 b20Fixed  |
Related Reports
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Relates :
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Description
In JDK-8203628, Aleksey added matchers to generate testb instruction (on x86) for LoadB->AndI->CmpI sequence. However, in AndINode::Ideal() we transform any LoadB->AndI to LoadUB->AndI which fails to match this pattern. Which means we never actually match for testb. The original matchers for LoadUB->AndI->CmpI needed to be removed because of JDK-8204479.