From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14165 invoked by alias); 9 Nov 2005 19:50:05 -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 14073 invoked by uid 48); 9 Nov 2005 19:49:58 -0000 Date: Wed, 09 Nov 2005 19:50:00 -0000 Message-ID: <20051109194958.14072.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug inline-asm/24761] Missing register load before inline asm in templated function causes SIGSEGV In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "krzysiek-gcc dot gnu dot org at lichota dot net" X-SW-Source: 2005-11/txt/msg01330.txt.bz2 List-Id: ------- Comment #2 from krzysiek-gcc dot gnu dot org at lichota dot net 2005-11-09 19:49 ------- Created an attachment (id=10195) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10195&action=view) Assembler code generated from testcase This is code generated from testcase. In first instantiation eax register is loaded before inline asm starts: .loc 1 25 0 movl -16(%ebp), %eax addl -20(%ebp), %eax sall $2, %eax addl 8(%ebp), %eax movl %eax, -8(%ebp) .loc 1 41 0 movl -16(%ebp), %eax addl -24(%ebp), %eax sall $2, %eax movl %eax, %edx addl -12(%ebp), %edx movl -8(%ebp), %eax #APP movq (%edx), %mm0 ; In the second instantiation, eax is not loaded: .loc 1 25 0 movl -16(%ebp), %eax addl -20(%ebp), %eax sall $2, %eax addl 8(%ebp), %eax movl %eax, -8(%ebp) .loc 1 41 0 movl -16(%ebp), %eax addl -24(%ebp), %eax sall $2, %eax movl %eax, %edx addl -12(%ebp), %edx #APP movq (%edx), %mm0 ; Then in line: pxor (%eax), %mm0 ; eax is dereferenced and segfault occurs. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24761