From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 15004 invoked by alias); 30 Jan 2010 16:46:03 -0000 Received: (qmail 14958 invoked by uid 48); 30 Jan 2010 16:45:51 -0000 Date: Sat, 30 Jan 2010 16:46:00 -0000 Message-ID: <20100130164551.14957.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug tree-optimization/42906] [4.5 Regression] Empty loop not removed In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "steven 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: 2010-01/txt/msg03427.txt.bz2 ------- Comment #3 from steven at gcc dot gnu dot org 2010-01-30 16:45 ------- Hack that may be worth trying: Index: tree-ssa-dce.c =================================================================== --- tree-ssa-dce.c (revision 156352) +++ tree-ssa-dce.c (working copy) @@ -683,7 +683,10 @@ propagate_necessity (struct edge_list *e { for (k = 0; k < gimple_phi_num_args (stmt); k++) { + tree t = gimple_phi_arg_def (stmt, k); basic_block arg_bb = gimple_phi_arg_edge (stmt, k)->src; + if (is_gimple_min_invariant (t)) + continue; if (arg_bb != ENTRY_BLOCK_PTR && ! TEST_BIT (visited_control_parents, arg_bb->index)) { -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42906