From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 13271 invoked by alias); 17 May 2002 17:56:04 -0000 Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-prs-owner@gcc.gnu.org Received: (qmail 13235 invoked by uid 71); 17 May 2002 17:56:02 -0000 Resent-Date: 17 May 2002 17:56:02 -0000 Resent-Message-ID: <20020517175602.13233.qmail@sources.redhat.com> Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer) Resent-To: nobody@gcc.gnu.org Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org Resent-Reply-To: gcc-gnats@gcc.gnu.org, dbaron@fas.harvard.edu Received:(qmail 7349 invoked by uid 61); 17 May 2002 17:53:35 -0000 Message-Id:<20020517175334.7346.qmail@sources.redhat.com> Date: Fri, 17 May 2002 10:56:00 -0000 From: dbaron@fas.harvard.edu Reply-To: dbaron@fas.harvard.edu To: gcc-gnats@gcc.gnu.org X-Send-Pr-Version:gnatsweb-2.9.3 (1.1.1.1.2.31) Subject: optimization/6703: optimized memset fills incorrect number of bytes for void** parameter X-SW-Source: 2002-05/txt/msg00518.txt.bz2 List-Id: >Number: 6703 >Category: optimization >Synopsis: optimized memset fills incorrect number of bytes for void** parameter >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: wrong-code >Submitter-Id: net >Arrival-Date: Fri May 17 10:56:01 PDT 2002 >Closed-Date: >Last-Modified: >Originator: David Baron >Release: gcc version 3.1 >Organization: >Environment: > /usr/local/gcc-3.1/bin/gcc -v Reading specs from /usr/local/gcc-3.1/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs Configured with: ../gcc-3.1/configure --prefix=/usr/local/gcc-3.1 --enable-languages=c++ Thread model: single gcc version 3.1 > uname -a Linux dbaron 2.4.9-21smp #1 SMP Thu Jan 17 14:01:48 EST 2002 i686 unknown RedHat 7.2 >Description: When building with -O, memset fills the incorrect number of bytes when its parameter is void**. This problem currently causes incorrect behavior in Mozilla when compiled with gcc 3.1. This bug is new in gcc 3.1 and did not occur in gcc 3.0.4. A simple testcase is the following file, to be saved as test.cpp (the bug shows up in C++ but not C): ----- #include #include static void do_memset(void **p, int size) { // gcc 3.1 -O2 bug: // If |size| is less than 4, then the memset will ignore it and // instead use |p & 3| for the size. If |size| is bigger than 4, // then it's also doing something strange. memset(p, 0x00, size); } int main() { char fooc[8]; memset(fooc, 0xba, sizeof(fooc)); do_memset((void**)(fooc + 3), 1); int *fooi = (int*) fooc; printf("%08X %08X\n", fooi[0], fooi[1]); return 0; } ----- This will incorrectly fill 3 bytes instead of 1, and produce the output: > /usr/local/gcc-3.1/bin/gcc -O test.cpp ; ./a.out 00BABABA BABA0000 Changing the 3 and the 1 in the line that calls do_memset will produce different results, often incorrect as well. The comment in the source above explains what seems to be happening for |size < 4|. Preprocessor output (test.ii) when using the above .cpp file is attached. >How-To-Repeat: /usr/local/gcc-3.1/bin/gcc -O test.cpp ; ./a.out displays: 00BABABA BABA0000 expected result: 00BABABA BABABABA >Fix: >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: application/octet-stream; name="test.ii" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="test.ii" IyAxICJ0ZXN0LmNwcCIKIyAxICI8YnVpbHQtaW4+IgojIDEgIjxjb21tYW5kIGxpbmU+IgojIDEg InRlc3QuY3BwIgoKIyAxICIvdXNyL2luY2x1ZGUvc3RyaW5nLmgiIDEgMwojIDI2ICIvdXNyL2lu Y2x1ZGUvc3RyaW5nLmgiIDMKIyAxICIvdXNyL2luY2x1ZGUvZmVhdHVyZXMuaCIgMSAzCiMgMjgz ICIvdXNyL2luY2x1ZGUvZmVhdHVyZXMuaCIgMwojIDEgIi91c3IvaW5jbHVkZS9zeXMvY2RlZnMu aCIgMSAzCiMgMjg0ICIvdXNyL2luY2x1ZGUvZmVhdHVyZXMuaCIgMiAzCiMgMzEyICIvdXNyL2lu Y2x1ZGUvZmVhdHVyZXMuaCIgMwojIDEgIi91c3IvaW5jbHVkZS9nbnUvc3R1YnMuaCIgMSAzCiMg MzEzICIvdXNyL2luY2x1ZGUvZmVhdHVyZXMuaCIgMiAzCiMgMjcgIi91c3IvaW5jbHVkZS9zdHJp 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