git: openjdk/jdk: 8284981: Support the vectorization of some counting-down loops in SLP

[Jie Fu]

Changeset: df7fba1c
Author:    Fei Gao <fgao at openjdk.org>
Committer: Jie Fu <jiefu at openjdk.org>
Date:      2022-04-30 07:39:16 +0000
URL:       https://git.openjdk.java.net/jdk/commit/df7fba1cda336c3d9940f0496082bff715711b68

8284981: Support the vectorization of some counting-down loops in SLP

Reviewed-by: roland, kvn

! src/hotspot/share/opto/superword.cpp
+ test/hotspot/jtreg/compiler/c2/irTests/TestAutoVecCountingDownLoop.java
! test/hotspot/jtreg/compiler/codegen/TestIntVect.java