tree 0a00a3b061ea264bc206c8174529a608b888bb7f
parent 2d82465d18520820c52fea6b5e400a692ffdb92a
author Iskander Sharipov <iskander.sharipov@intel.com> 1536092093 +0300
committer Iskander Sharipov <iskander.sharipov@intel.com> 1537182898 +0000

cmd/compile/internal/gc: handle array slice self-assign in esc.go

Instead of skipping all OSLICEARR, skip only ones with non-pointer
array type. For pointers to arrays, it's safe to apply the
self-assignment slicing optimizations.

Refactored the matching code into separate function for readability.

This is an extension to already existing optimization.

On its own, it does not improve any code under std, but
it opens some new optimization opportunities. One
of them is described in the referenced issue.

Updates #7921

Change-Id: I08ac660d3ef80eb15fd7933fb73cf53ded9333ad
Reviewed-on: https://go-review.googlesource.com/133375
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>