JDK-8160006 : Fix AArch64 after changes made by 8151661
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 9
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: linux
  • CPU: aarch64
  • Submitted: 2016-06-21
  • Updated: 2021-03-01
  • Resolved: 2016-06-21
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JDK 8 JDK 9
8u281Fixed 9 b127Fixed
Related Reports
Duplicate :  
JDK-8159815 - Fix regression caused by fix for 8151661
Description
Fix ad file for AArch64 after matcher change is backed out due to perf regression
Comments
JDk-8151661 backed out a change to the matcher algorithm originally made on behalf of AArch64 because it caused a performance regression on SPARC. The change leaves the AArch64 build broken because each long branch rule has more than one equivalent matching short branch rule. The rules need adjusting so that the predicates which were previously used to distinguish matches are replaced with match operands that embed the relevant predicate in the operand, rendering the different long and short rule pairs distinct.
21-06-2016