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List: gcc-bugs
Subject: [Bug middle-end/30322] ((-i-1) + i) +1) is turned into ~i + (i+1) and never into 0 on the tree level
From: "sayle at gcc dot gnu dot org" <gcc-bugzilla () gcc ! gnu ! org>
Date: 2006-12-31 16:17:59
Message-ID: 20061231161759.22183.qmail () sourceware ! org
[Download RAW message or body]
------- Comment #2 from sayle at gcc dot gnu dot org 2006-12-31 16:17 -------
Subject: Bug 30322
Author: sayle
Date: Sun Dec 31 16:17:49 2006
New Revision: 120300
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=120300
Log:
PR middle-end/30322
* fold-const.c (fold_binary): Fold X + ~X and ~X + X into -1 when
we don't care about trapping overflow. Only convert -A - 1 into ~A
when we don't care about trapping overflow.
* gcc.dg/fold-plusnot-1.c: New test case.
Added:
trunk/gcc/testsuite/gcc.dg/fold-plusnot-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/fold-const.c
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30322
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