JDK-8187964 : [s390], [ppc]: Intrinsify Math.multiplyHigh(long, long) (Platform work)
- Type: Enhancement
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 10
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: ppc,s390x
- Submitted: 2017-09-26
- Updated: 2017-11-10
- Resolved: 2017-10-09
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| JDK 10 |
|---|
10 b31Fixed  |
Related Reports
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Relates :
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Description
Building on the initial work in 8187684, support for Math.multiplyHigh is implemented for the s390 and ppc platforms. For [s390], work is limited to implementing an instruct for the MulHiL opcode in the s390.ad file. For [ppc], there is no extra work required. The instruct for MulHiL already exists. Microbenchmark performance: s390: A speedup of 4x to 5x was observed across all available processor generations (z10, z196, z13). ppc: A speedup of 10x to 15x was observed on Power8, slightly less on Power7.