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  1. JDK
  2. JDK-8259044

JVM lacks data type qualifier when using -XX:+PrintAssembly with AArch64-Neon backend

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Details

    • Enhancement
    • Status: Resolved
    • P4
    • Resolution: Fixed
    • 17
    • 17
    • hotspot
    • b05
    • aarch64

    Description

      For instace: in the implentation of VectorMaskCmp & VectorStoreMask :

      $jtreg -vmoptions:"-XX:+PrintAssembly" ./Int128VectorTests.java

      before fixing
      -----------------
      0dc ldrq V17,[R10, #16] # vector (128 bits)
      0e0 cmeq V16, V16, V17 # vector cmp (4I)
      0e4 xtn V16, V16 # 4S to 4H
              xtn V16, V16 # 4H to 4B
              negr V16, V16 # store mask (4S to 4B)
      -----------------
      Hereļ¼Œ the output lacks data type qualifiers like T4S in `cmeq V16, V16, V17`.

      Expect:
      -----------------
      0dc ldrq V16,[R10, #16] # vector (128 bits)
      0e0 cmeq V16, T4S, V16, V18 # vector cmp (4I)
      0e4 xtn V16, T4H, V16, T4S # 4S to 4H
                 xtn V16, T8B, V16, T8H # 4H to 4B
                 negr V16, T8B, V16 # store mask (4S to 4B)
      -----------------

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              whuang Wang Huang
              whuang Wang Huang
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                Created:
                Updated:
                Resolved: