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

[Jatin Bhateja]

On Wed, 14 Feb 2024 14:31:03 GMT, Scott Gibbons <sgibbons at openjdk.org> wrote:

>> Scott Gibbons has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove gcc lib fn; reduce spacial cases to 10 from 32
>
> 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)

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

PR Comment: https://git.openjdk.org/jdk/pull/16753#issuecomment-1953840322