Integrated: 8268363: AArch64: Implement string_indexof_char intrinsic in SVE

[TatWai Chong]

On Wed, 23 Jun 2021 04:19:11 GMT, TatWai Chong <github.com+78814694+tatwaichong at openjdk.org> wrote:

> This patch implements string_indexof_char intrinsic in SVE for both
> UTF-16 and Latin-8 variants. In the current underneath implementation,
> there is only 4 and 8 characters are compared at a time in UTF-16 and
> Latin-8 respectively. In this patch, we adopt SVE to vectorize this
> intrinsic so that a wider comparison can be performed each time.
> 
> I've run [1] with this patch on an SVE machine, and the performance of
> StringIndexOfChar.latin1_mixed_char (length=65) and
> StringIndexOfChar.utf16_mixed_char (length=65) are improved significantly,
> while no visible regression for other cases with shorter strings.
> (length=7, 8, 15, 16 and 32)
> 
> [1] https://github.com/openjdk/jdk/blob/master/test/micro/org/openjdk/bench/java/lang/StringIndexOfChar.java

This pull request has now been integrated.

Changeset: e54585be
Author:    TatWai Chong <tatwai.chong at arm.com>
Committer: Ningsheng Jian <njian at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/e54585be57a2fe8db07f20bf8e3d5f92aefe2470
Stats:     381 lines in 9 files changed: 262 ins; 0 del; 119 mod

8268363: AArch64: Implement string_indexof_char intrinsic in SVE

Reviewed-by: aph, njian

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PR: https://git.openjdk.java.net/jdk/pull/4567