RFR: 8307352: AARCH64: Improve itable_stub [v2]

[Boris Ulasevich]

> This is a change for AARCH similar to https://github.com/openjdk/jdk/pull/13460 
> 
> The change replaces two separate iterations over the itable with a new algorithm consisting of two loops. First, we look for a match with resolved_klass, checking for a match with holder_klass along the way. Then we continue iterating (not starting over) the itable using the second loop, checking only for a match with holder_klass.
> 
> InterfaceCalls openjdk benchmark performance results on A53, A72, Neoverse N1 and V1 micro-architectures:
> 
> 
> Cortex-A53 (Pi 3 Model B Rev 1.2)
> 
> test1stInt2Types    37.5      37.358     0.38
> test1stInt3Types   160.166   148.04      8.19
> test1stInt5Types   158.131   147.955     6.88
> test2ndInt2Types    52.634    53.291    -1.23
> test2ndInt3Types   201.39    181.603    10.90
> test2ndInt5Types   195.722   176.707    10.76
> testIfaceCall      157.453   140.498    12.07
> testIfaceExtCall   175.46    154.351    13.68
> testMonomorphic     32.052    32.039     0.04
>                                  AVG:    6.85
> 
> Cortex-A72 (Pi 4 Model B Rev 1.2)
> 
> test1stInt2Types    27.4796   27.4738    0.02
> test1stInt3Types    66.0085   64.9374    1.65
> test1stInt5Types    67.9812   66.2316    2.64
> test2ndInt2Types    32.0581   32.062    -0.01
> test2ndInt3Types    68.2715   65.6643    3.97
> test2ndInt5Types    68.1012   65.8024    3.49
> testIfaceCall       64.0684   64.1811   -0.18
> testIfaceExtCall    91.6226   81.5867   12.30
> testMonomorphic     26.7161   26.7142    0.01
>                                  AVG:    2.66
> 
> Neoverse N1 (m6g.metal)
> 
> test1stInt2Types     2.9104    2.9086    0.06
> test1stInt3Types    10.9642   10.2909    6.54
> test1stInt5Types    10.9607   10.2856    6.56
> test2ndInt2Types     3.3410    3.3478   -0.20
> test2ndInt3Types    12.3291   11.3089    9.02
> test2ndInt5Types    12.328    11.2704    9.38
> testIfaceCall       11.0598   10.3657    6.70
> testIfaceExtCall    13.0692   11.2826   15.84
> testMonomorphic      2.2354    2.2341    0.06
>                                  AVG:    6.00
> 
> Neoverse V1 (c7g.2xlarge)
> 
> test1stInt2Types    2.2317     2.2320   -0.01
> test1stInt3Types    6.6884     6.1911    8.03
> test1stInt5Types    6.7334     6.2193    8.27
> test2ndInt2Types    2.4002     2.4013   -0.04
> test2ndInt3Types    7.9603     7.0372   13.12
> test2ndInt5Types    7.9532     7.0474   12.85
> testIfaceCall       6.7028     6.3272    5.94
> testIfaceExtCall    8.3253     6.9416   19.93
> testMonomorphic     1.2446     1.2544   -0.79
>                                  AVG:    7.48 
> 
> 
> Testing...

Boris Ulasevich has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains one additional commit since the last revision:

  8307352: AARCH64: Improve itable_stub

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13792/files
  - new: https://git.openjdk.org/jdk/pull/13792/files/fe5e845c..16f6826a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13792&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13792&range=00-01

  Stats: 31656 lines in 1140 files changed: 12412 ins; 13072 del; 6172 mod
  Patch: https://git.openjdk.org/jdk/pull/13792.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13792/head:pull/13792

PR: https://git.openjdk.org/jdk/pull/13792