RFR: 8320448: Accelerate IndexOf using AVX2 [v20]

[Scott Gibbons]

On Tue, 21 May 2024 18:03:41 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> Scott Gibbons has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Addressing lots of comments.  Interim commit.
>
> src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp line 4648:
> 
>> 4646:     vpxor(vec1, vec2);
>> 4647: 
>> 4648:     vptest(vec1, vec1);
> 
> These should be only 128 bit:
>    pxor(vec1, vec2);
>    ptest(vec1, vec1);

Fixed

> src/hotspot/cpu/x86/stubGenerator_x86_64_string.cpp line 1351:
> 
>> 1349:   assert_different_registers(needle, needleVal);
>> 1350: 
>> 1351:   bool isLL = (ae == StrIntrinsicNode::LL);
> 
> isLL not used in this function.

Fixed

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

PR Review Comment: https://git.openjdk.org/jdk/pull/16753#discussion_r1609164643
PR Review Comment: https://git.openjdk.org/jdk/pull/16753#discussion_r1609164578