From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-414993-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 28827 invoked by alias); 12 Feb 2013 11:42:55 -0000
Received: (qmail 28759 invoked by uid 48); 12 Feb 2013 11:42:35 -0000
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/55309] gcc's address-sanitizer 66% slower than clang's
Date: Tue, 12 Feb 2013 11:42:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: sanitizer
X-Bugzilla-Keywords:
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: jakub at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-55309-4-jiroxf90F0@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-55309-4@http.gcc.gnu.org/bugzilla/>
References: <bug-55309-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2013-02/txt/msg01158.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55309

--- Comment #39 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-12 11:42:33 UTC ---
So, if Darwin keeps the old 1ULL << 44, then the corresponding gcc change (to
be applied together with asan merge) would be something like (untested):
--- gcc/sanitizer.def    2013-01-11 09:02:37.879637130 +0100
+++ gcc/sanitizer.def    2013-02-12 12:39:12.743272092 +0100
@@ -27,7 +27,7 @@ along with GCC; see the file COPYING3.
    for other FEs by asan.c.  */

 /* Address Sanitizer */
-DEF_SANITIZER_BUILTIN(BUILT_IN_ASAN_INIT, "__asan_init",
+DEF_SANITIZER_BUILTIN(BUILT_IN_ASAN_INIT, "__asan_init_v1",
               BT_FN_VOID, ATTR_NOTHROW_LEAF_LIST)
 /* Do not reorder the BUILT_IN_ASAN_REPORT* builtins, e.g. cfgcleanup.c
    relies on this order.  */
--- gcc/config/i386/i386.c    2013-02-12 11:23:35.400193705 +0100
+++ gcc/config/i386/i386.c    2013-02-12 12:38:30.775503155 +0100
@@ -5436,7 +5436,9 @@ ix86_legitimate_combined_insn (rtx insn)
 static unsigned HOST_WIDE_INT
 ix86_asan_shadow_offset (void)
 {
-  return (unsigned HOST_WIDE_INT) 1 << (TARGET_LP64 ? 44 : 29);
+  return TARGET_LP64 ? (TARGET_MACHO ? (HOST_WIDE_INT_1 << 44)
+                     : HOST_WIDE_INT_C (0x7fff8000))
+             : (HOST_WIDE_INT_1 << 29);
 }


 /* Argument support functions.  */