From: Martin Kronbichler <kronbichler@lnm.mw.tum.de>
Date: Sat, 10 Jun 2017 20:32:23 +0000 (+0200)
Subject: Merge pull request #4494 from kronbichler/multigrid_performance_improvement
X-Git-Tag: v9.0.0-rc1~1513
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a097709aaa3def65624dfda81c57b9f993277f4b;p=dealii.git

Merge pull request #4494 from kronbichler/multigrid_performance_improvement

Use shortcut in multigrid smoothing in case we want to zero out vector
---

a097709aaa3def65624dfda81c57b9f993277f4b