hg: jdk/jdk: 8242429: Better implementation for sign extract

[ningsheng.jian at arm.com]

Changeset: bbdcc6741915
Author:    yzhang
Date:      2020-05-12 10:19 +0800
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/bbdcc6741915

8242429: Better implementation for sign extract
Reviewed-by: vlivanov, thartmann
Contributed-by: eric.c.liu at arm.com

! src/hotspot/cpu/aarch64/aarch64.ad
! src/hotspot/share/opto/mulnode.cpp
! src/hotspot/share/opto/subnode.cpp
+ test/hotspot/jtreg/compiler/c2/TestSignExtract.java