RFR: JDK-8320448 Accelerate IndexOf using AVX2 [v8]

[Scott Gibbons]

On Tue, 20 Feb 2024 09:49:23 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> Thank you all for the reviews.  I have been asked to simplify this code to facilitate easier review, and to remove the gcc library code I used for memcmp.  We also discovered that special-casing up to 31 bytes of needle was not necessary to get the performance gain.  I will be commenting the code and fixing the single build failure soon.
>
> Hi @asgibbons ,
> 
> I am getting following error with slowdebug build on Meteor Lake system.
> 
> 
> ERROR: Build failed for target 'images' in configuration 'linux-x86_64-server-slowdebug' (exit code 2) 
> 
> === Output from failing command(s) repeated here ===
> * For target buildtools_create_symbols_javac__the.COMPILE_CREATE_SYMBOLS_batch:
> #
> # A fatal error has been detected by the Java Runtime Environment:
> #
> #  Internal Error (/home/jatinbha/sandboxes/jdk-reviews/jdk/src/hotspot/share/asm/assembler.hpp:169), pid=237140, tid=237235
> #  assert(is_bound() || is_unused()) failed: Label was never bound to a location, but it was used as a jmp target
> #
> # JRE version: OpenJDK Runtime Environment (23.0) (slowdebug build 23-internal-adhoc.sdp.jdk)
> # Java VM: OpenJDK 64-Bit Server VM (slowdebug 23-internal-adhoc.sdp.jdk, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
> # Problematic frame:
> # V  [libjvm.so+0x4c9e3e]  Label::~Label()+0x5c
> #
> # Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport -p%p -s%s -c%c -d%d -P%P -u%u -g%g -- %E" (or dumping to /home/jatinbha/sandboxes/jdk-reviews/jdk/make/core.237140)
> #
> # An error report file with more information is saved as:
> # /home/jatinbha/sandboxes/jdk-reviews/jdk/make/hs_err_pid237140.log
>    ... (rest of output omitted)

@jatin-bhateja Thanks for the note.  Fixed a couple of slowdebug compile issues.  Now builds successfully on Meteor Lake system.

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PR Comment: https://git.openjdk.org/jdk/pull/16753#issuecomment-1957038856