From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 23278 invoked by alias); 1 Nov 2007 20:59:46 -0000 Received: (qmail 23226 invoked by uid 48); 1 Nov 2007 20:59:37 -0000 Date: Thu, 01 Nov 2007 20:59:00 -0000 Message-ID: <20071101205937.23225.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug rtl-optimization/33922] [4.3 Regression] slow compilation on ia64 (postreload scheduling) In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "jakub 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: 2007-11/txt/msg00068.txt.bz2 ------- Comment #22 from jakub at gcc dot gnu dot org 2007-11-01 20:59 ------- The most important cause of the slowdown e.g. compared to 4.2.x is the totally insane thing -ftree-pre creates though. For -O3 -fno-tree-vectorize -fdump-tree-all pr33922.c wc -l shows 2361 pr33922.c.090t.sink while for -O3 -fno-tree-vectorize -fno-tree-pre -fdump-tree-all pr33922.c 324 pr33922.c.090t.sink and of course the size of assembly corresponds to this: 11400 pr33922.s # -O3 -fno-tree-vectorize 195 pr33922.s # -O3 -fno-tree-vectorize -fno-tree-pre -O3 -fno-tree-vectorize -fdump-tree-pre-all dump contains 2081 ^Created.*value lines and all those constants are actually created and many PHI nodes as well. I believe this might be what nickc was trying to fix today by adding a limit, but wasn't that limit huge (131072 bits)? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33922