From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 18744 invoked by alias); 14 May 2009 19:44:03 -0000 Received: (qmail 18568 invoked by uid 48); 14 May 2009 19:43:34 -0000 Date: Thu, 14 May 2009 19:44:00 -0000 Message-ID: <20090514194334.18567.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug target/39942] Nonoptimal code - leaveq; xchg %ax,%ax; retq In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "vvv at ru dot ru" 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: 2009-05/txt/msg01270.txt.bz2 ------- Comment #34 from vvv at ru dot ru 2009-05-14 19:43 ------- (In reply to comment #32) > Please make sure that you only test nop paddings for branch insns, > not nop paddings for branch targets, which prefer 16byte alignment. Additional tests (for Core2) results: 1. Execution time don't depend on paddings for branch target. 2. Execution time don't depend on position of NOP within 16-byte chunk with 4 branch. Even if NOP inserted between CMP and conditional jump. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39942