From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 26477 invoked by alias); 27 May 2004 17:48:54 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 26454 invoked by uid 48); 27 May 2004 17:48:52 -0000 Date: Fri, 28 May 2004 07:11:00 -0000 Message-ID: <20040527174852.26453.qmail@sourceware.org> From: "pinskia at gcc dot gnu dot org" To: gcc-bugs@gcc.gnu.org In-Reply-To: <20040522223754.15596.pinskia@gcc.gnu.org> References: <20040522223754.15596.pinskia@gcc.gnu.org> Reply-To: gcc-bugzilla@gcc.gnu.org Subject: [Bug tree-optimization/15596] [3.5 Regression] Missed optimization with bitfields X-Bugzilla-Reason: CC X-SW-Source: 2004-05/txt/msg03276.txt.bz2 List-Id: ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-27 17:48 ------- It is much worse for x86. (-O3 -fomit-frame-pointer) After: fun: movl 4(%esp), %eax movl 8(%esp), %ecx movl (%eax), %edx andl $1048575, %ecx andl $-1048576, %edx orl %ecx, %edx movl %edx, (%eax) movzbl 2(%eax), %edx orb $16, %dl andb $-33, %dl movb %dl, 2(%eax) movl 12(%esp), %ecx movl (%eax), %edx andl $1, %ecx sall $22, %ecx andl $-4194305, %edx orl %ecx, %edx movl %edx, (%eax) ret $4 Before: pushl %ebp andl $-1048576, %ecx movl %esp, %ebp movl 12(%ebp), %edx movl 8(%ebp), %eax andl $1048575, %edx orl %edx, %ecx movl 16(%ebp), %edx orl $1048576, %ecx andl $-6291457, %ecx andl $1, %edx sall $22, %edx orl %edx, %ecx movl %ecx, (%eax) popl %ebp ret $4 -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 GCC target triplet|powerpc-apple-darwin | Last reconfirmed|0000-00-00 00:00:00 |2004-05-27 17:48:51 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15596