From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 28384 invoked by alias); 16 Jun 2011 11:28:03 -0000 Received: (qmail 28361 invoked by uid 22791); 16 Jun 2011 11:28:01 -0000 X-SWARE-Spam-Status: No, hits=-2.7 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,TW_VZ X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 16 Jun 2011 11:27:48 +0000 From: "gcc.hall at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/33349] Redundant zero-extension of registers X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: gcc.hall at gmail dot com X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: CC Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Thu, 16 Jun 2011 11:28:00 -0000 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: 2011-06/txt/msg01430.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33349 Jeremy changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |gcc.hall at gmail dot com --- Comment #2 from Jeremy 2011-06-16 11:27:24 UTC --- Another example I came across ... unsigned short sw; asm( "fnstsw %0" : "=a" (sw) ); if( sw & FE_DIVBYZERO ) ... if( sw & FE_OVERFLOW ) ... if( sw & FE_UNDERFLOW ) ... generates: movzx eax, ax # D.14460, sw test al, 1 # D.14460, test al, 4 # D.14460, test al, 8 # D.14460,