From: Christoph Mallon <christoph.mallon@gmx.de>
Date: Thu, 13 Sep 2007 13:22:04 +0000 (+0000)
Subject: Fix r15779 and generalise. Also implement
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=930f2dd6bb1a970ce54f485775945c855b3b30a5;hp=930f2dd6bb1a970ce54f485775945c855b3b30a5;p=libfirm

Fix r15779 and generalise. Also implement
- -a - b -> -(a + b)
- a - -b -> a + b

[r15781]
---