On Mon, 16 Aug 2021 20:59:55 GMT, TatWai Chong <d...@openjdk.java.net> wrote:
> This patch implements string_compare intrinsic in SVE. > It supports all LL, LU, UL and UU comparisons. > > As we haven't found an existing benchmark to measure performance impact, > we created a benchmark derived from the test [1] for this evaluation. > This benchmark is attached to this patch. > > Besides, remove the unused temporary register `vtmp3` from the existing > match rules for StrCmp. > > The result below shows all varients can be benefited largely. > Command: make exploded-test TEST="micro:StringCompareToDifferentLength" > > Benchmark (size) Mode Cnt Score Speedup Units > compareToLL 24 avgt 10 1.0x ms/op > compareToLL 36 avgt 10 1.0x ms/op > compareToLL 72 avgt 10 1.0x ms/op > compareToLL 128 avgt 10 1.4x ms/op > compareToLL 256 avgt 10 1.8x ms/op > compareToLL 512 avgt 10 2.7x ms/op > compareToLU 24 avgt 10 1.6x ms/op > compareToLU 36 avgt 10 1.8x ms/op > compareToLU 72 avgt 10 2.3x ms/op > compareToLU 128 avgt 10 3.8x ms/op > compareToLU 256 avgt 10 4.7x ms/op > compareToLU 512 avgt 10 6.3x ms/op > compareToUL 24 avgt 10 1.6x ms/op > compareToUL 36 avgt 10 1.7x ms/op > compareToUL 72 avgt 10 2.2x ms/op > compareToUL 128 avgt 10 3.3x ms/op > compareToUL 256 avgt 10 4.4x ms/op > compareToUL 512 avgt 10 6.1x ms/op > compareToUU 24 avgt 10 1.0x ms/op > compareToUU 36 avgt 10 1.0x ms/op > compareToUU 72 avgt 10 1.4x ms/op > compareToUU 128 avgt 10 2.2x ms/op > compareToUU 256 avgt 10 2.6x ms/op > compareToUU 512 avgt 10 3.7x ms/op > > [1] > https://github.com/openjdk/jdk/blob/master/test/hotspot/jtreg/compiler/intrinsics/string/TestStringCompareToDifferentLength.java This pull request has now been integrated. Changeset: 8b1b6f9f Author: TatWai Chong <tatwai.ch...@arm.com> Committer: Nick Gasson <ngas...@openjdk.org> URL: https://git.openjdk.java.net/jdk/commit/8b1b6f9fb375bbc2de339ad8f526ca4d5f83dc70 Stats: 517 lines in 11 files changed: 421 ins; 1 del; 95 mod 8269559: AArch64: Implement string_compare intrinsic in SVE Reviewed-by: ngasson, aph ------------- PR: https://git.openjdk.java.net/jdk/pull/5129
