From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 15458 invoked by alias); 4 Jun 2009 18:18:25 -0000 Received: (qmail 15421 invoked by uid 48); 4 Jun 2009 18:18:12 -0000 Date: Thu, 04 Jun 2009 18:18:00 -0000 Message-ID: <20090604181812.15420.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug middle-end/24929] long long shift/mask operations should be better optimized In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "aldot 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: 2009-06/txt/msg00249.txt.bz2 ------- Comment #7 from aldot at gcc dot gnu dot org 2009-06-04 18:18 ------- (In reply to comment #5) > movzbl 18(%esp), %eax > > could be used in this particular case. 4.3.3 onward seem to do that. Fixed? $ for i in 4.2 4.3 4.4 4.5.orig-HEAD;do printf "### %s\n" $(gcc-$i -dumpversion) ; gcc-$i -march=i386 -O2 -S -o- pr24929.c -fomit-frame-pointer | awk 'BEGIN{yep=0;}/^f:/{yep=1;}/^\./{yep=0;}{if (yep){print $0}}';done ### 4.2.4 f: pushl %edi pushl %esi pushl %ebx movl 16(%esp), %esi movl 20(%esp), %edi movl 24(%esp), %ecx movl 28(%esp), %ebx movl %ebx, %ecx xorl %ebx, %ebx shrl $16, %ecx movzbl %cl,%eax xorl %edx, %edx shldl $8, %esi, %edi sall $8, %esi orl %esi, %eax orl %edi, %edx popl %ebx popl %esi popl %edi ret .size f, .-f .p2align 2,,3 ### 4.3.3 f: movl 4(%esp), %edx movl 8(%esp), %ecx shldl $8, %edx, %ecx sall $8, %edx movzbl 18(%esp), %eax orl %edx, %eax movl %ecx, %edx ret .size f, .-f .p2align 2,,3 ### 4.4.0 f: movl 4(%esp), %edx movl 8(%esp), %ecx shldl $8, %edx, %ecx sall $8, %edx movzbl 18(%esp), %eax orl %edx, %eax movl %ecx, %edx ret .size f, .-f .p2align 2,,3 ### 4.5.0 f: movl 4(%esp), %edx movl 8(%esp), %ecx shldl $8, %edx, %ecx sall $8, %edx movzbl 18(%esp), %eax orl %edx, %eax movl %ecx, %edx ret .size f, .-f .p2align 2,,3 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24929