RFR: 8323116: [REDO] Computational test more than 2x slower when AVX instructions are used [v2]

Wed Mar 27 22:37:44 UTC 2024

> The goal of this PR is improve the performance of convert instructions and address the slowdown when AVX>0 is used.
> 
> The performance data using the ComputePI.java benchmark (part of this PR) is as follows:
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> Benchmark (ns/op) | Stock JDK | This PR (AVX=3) | Speedup
> -- | -- | -- | --
> ComputePI.compute_pi_dbl_flt | 511.34 | 511.226 | 1.0
> ComputePI.compute_pi_flt_dbl | 2024.06 | 541.544 | 3.7
> ComputePI.compute_pi_int_dbl | 695.482 | 506.546 | 1.4
> ComputePI.compute_pi_int_flt | 799.268 | 450.298 | 1.8
> ComputePI.compute_pi_long_dbl | 802.992 | 577.984 | 1.4
> ComputePI.compute_pi_long_flt | 628.62 | 549.057 | 1.1
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> Benchmark (ns/op) | Stock JDK | This PR (AVX=0) | Speedup
> -- | -- | -- | --
> ComputePI.compute_pi_dbl_flt | 473.778 | 472.529 | 1.0
> ComputePI.compute_pi_flt_dbl | 536.004 | 538.418 | 1.0
> ComputePI.compute_pi_int_dbl | 458.08 | 460.245 | 1.0
> ComputePI.compute_pi_int_flt | 477.305 | 476.975 | 1.0
> ComputePI.compute_pi_long_dbl | 455.132 | 455.064 | 1.0
> ComputePI.compute_pi_long_flt | 474.734 | 476.571 | 1.0
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Srinivas Vamsi Parasa has updated the pull request incrementally with three additional commits since the last revision:

 - Update ComputePI.java
 - Update ComputePI.java
 - Update TestConvertImplicitNullCheck.java

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18503/files
  - new: https://git.openjdk.org/jdk/pull/18503/files/556f3bb4..1b17e844

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18503&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18503&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18503.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18503/head:pull/18503

PR: https://git.openjdk.org/jdk/pull/18503