Integrated: 8279676: Dubious YMM register clearing in x86_64 arraycopy stubs
Aleksey Shipilev
shade at openjdk.java.net
Wed Jan 12 08:35:30 UTC 2022
On Mon, 10 Jan 2022 16:59:18 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:
> See discussion in the bug.
>
> Additional testing, TR3970X (Zen 2, AVX2):
> - [x] Linux x86_64 fastdebug `hotspot_compiler_arraycopy`
> - [x] Linux x86_64 fastdebug `tier1`
> - [x] Linux x86_64 fastdebug `tier2`
> - [x] Linux x86_64 fastdebug `tier3`
>
> Additional testing, i5-11500 (Rocket Lake, AVX-512):
> - [x] Linux x86_64 fastdebug `hotspot_compiler_arraycopy`
> - [x] Linux x86_64 fastdebug `tier1`
> - [x] Linux x86_64 fastdebug `tier2`
> - [x] Linux x86_64 fastdebug `tier3`
>
> Targeted arraycopy microbenchmarks find a barely noticeable improvement on TR 3970X and i5-11500 with UseAVX=2.
This pull request has now been integrated.
Changeset: 525b20fc
Author: Aleksey Shipilev <shade at openjdk.org>
URL: https://git.openjdk.java.net/jdk/commit/525b20fce0acd393f31fd37fe1f05f9d32577f77
Stats: 10 lines in 1 file changed: 0 ins; 10 del; 0 mod
8279676: Dubious YMM register clearing in x86_64 arraycopy stubs
Reviewed-by: kvn, vlivanov, neliasso
-------------
PR: https://git.openjdk.java.net/jdk/pull/7016
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