From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3805 invoked by alias); 4 Jan 2008 17:00:10 -0000 Received: (qmail 3368 invoked by uid 48); 4 Jan 2008 16:59:26 -0000 Date: Fri, 04 Jan 2008 17:04:00 -0000 Message-ID: <20080104165926.3367.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug middle-end/32964] [4.3 Regression] union cause inefficient code inside loops In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "rguenth at gcc dot gnu dot org" Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2008-01/txt/msg00372.txt.bz2 ------- Comment #5 from rguenth at gcc dot gnu dot org 2008-01-04 16:59 ------- The plain DECL does not work because 1) we don't do the storetmp 2) can_PRE_operation and can_value_number_operation return false (so we do not enter a into EXP_GEN 3) create_value_expr_from cannot handle it most of the rest of PRE looks like it may handle DECLs, but if you fix the above, vn_lookup_with_vuses still not finds VH.10, because it is not ANTIC_IN. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32964