JDK-8235288 : AVX 512 instructions inadvertently used on Xeon for small vector width operations
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 11.0.6,14
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • CPU: x86
  • Submitted: 2019-12-03
  • Updated: 2022-06-27
  • Resolved: 2019-12-04
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JDK 11 JDK 13 JDK 14
11.0.7-oracleFixed 13.0.4Fixed 14 b27Fixed
Description
For vector replicate and reduction operations vinsert and vextract instructions are used. When UseAVX level is set to 3, these instructions are unnecessarily encoded with 512 bit vector width.
Comments
Fix request (13u): The original change applies cleanly, passes tier1 and tier2 tests.
03-06-2020
Fix request (11u) Small, minimal risk patch for parity with Oracle 11.0.7, applies cleanly.
24-01-2020
URL: https://hg.openjdk.java.net/jdk/jdk/rev/666fa504b60c User: kvn Date: 2019-12-04 22:55:27 +0000
04-12-2019
http://cr.openjdk.java.net/~sviswanathan/8235288/webrev.00/
04-12-2019