tree 22b2fd05328333c37a8aea573e147d31ef9c6817
parent d0a102eea2262e3fca89b1eb342fd03328c4aa16
author Ian Lance Taylor <iant@golang.org> 1578374960 -0800
committer Ian Lance Taylor <iant@golang.org> 1578411260 +0000

compiler: avoid write barrier for a[i] = a[i][:v]

This avoids generating a write barrier for code that appears in the
Go1.14beta1 runtime package in (*pageAlloc).sysGrow:
    s.summary[l] = s.summary[l][:needIdxLimit]

Change-Id: If0c7c76eabbdd68c28e5e9e9233af013144f34f2
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/213558
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>