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* Re: optimization/6703: optimized memset fills incorrect number of bytes for void** parameter
@ 2002-05-20 2:56 Glen Nakamura
0 siblings, 0 replies; 4+ messages in thread
From: Glen Nakamura @ 2002-05-20 2:56 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR optimization/6703; it has been noted by GNATS.
From: Glen Nakamura <glen@imodulo.com>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
dbaron@fas.harvard.edu, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:
Subject: Re: optimization/6703: optimized memset fills incorrect number of
bytes for void** parameter
Date: Sun, 19 May 2002 23:48:23 -1000
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6703
This patch extracted from cvs diff -r 1.386 -r 1.387 seems to fix the problem:
ChangeLog
===================================================================
Tue Apr 23 14:24:25 CEST 2002 Jan Hubicka <jh@suse.cz>
* i386.c (ix86_expand_clrstr): Fix typo.
Index: i386.c
===================================================================
RCS file: /cvsroot/gcc/gcc/gcc/config/i386/i386.c,v
retrieving revision 1.368.2.9
diff -c -3 -p -r1.368.2.9 i386.c
*** i386.c 23 Apr 2002 08:11:22 -0000 1.368.2.9
--- i386.c 20 May 2002 09:30:28 -0000
*************** ix86_expand_clrstr (src, count_exp, alig
*** 9420,9426 ****
gen_rtx_SUBREG (SImode, zeroreg, 0)));
if (TARGET_64BIT && (align <= 4 || count == 0))
{
! rtx label = ix86_expand_aligntest (destreg, 2);
emit_insn (gen_strsetsi (destreg,
gen_rtx_SUBREG (SImode, zeroreg, 0)));
emit_label (label);
--- 9420,9426 ----
gen_rtx_SUBREG (SImode, zeroreg, 0)));
if (TARGET_64BIT && (align <= 4 || count == 0))
{
! rtx label = ix86_expand_aligntest (countreg, 2);
emit_insn (gen_strsetsi (destreg,
gen_rtx_SUBREG (SImode, zeroreg, 0)));
emit_label (label);
*************** ix86_expand_clrstr (src, count_exp, alig
*** 9431,9437 ****
gen_rtx_SUBREG (HImode, zeroreg, 0)));
if (align <= 2 || count == 0)
{
! rtx label = ix86_expand_aligntest (destreg, 2);
emit_insn (gen_strsethi (destreg,
gen_rtx_SUBREG (HImode, zeroreg, 0)));
emit_label (label);
--- 9431,9437 ----
gen_rtx_SUBREG (HImode, zeroreg, 0)));
if (align <= 2 || count == 0)
{
! rtx label = ix86_expand_aligntest (countreg, 2);
emit_insn (gen_strsethi (destreg,
gen_rtx_SUBREG (HImode, zeroreg, 0)));
emit_label (label);
*************** ix86_expand_clrstr (src, count_exp, alig
*** 9442,9448 ****
gen_rtx_SUBREG (QImode, zeroreg, 0)));
if (align <= 1 || count == 0)
{
! rtx label = ix86_expand_aligntest (destreg, 1);
emit_insn (gen_strsetqi (destreg,
gen_rtx_SUBREG (QImode, zeroreg, 0)));
emit_label (label);
--- 9442,9448 ----
gen_rtx_SUBREG (QImode, zeroreg, 0)));
if (align <= 1 || count == 0)
{
! rtx label = ix86_expand_aligntest (countreg, 1);
emit_insn (gen_strsetqi (destreg,
gen_rtx_SUBREG (QImode, zeroreg, 0)));
emit_label (label);
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: optimization/6703: optimized memset fills incorrect number of bytes for void** parameter
@ 2002-05-24 10:16 sayle
0 siblings, 0 replies; 4+ messages in thread
From: sayle @ 2002-05-24 10:16 UTC (permalink / raw)
To: dbaron, gcc-bugs, gcc-prs, nobody
Synopsis: optimized memset fills incorrect number of bytes for void** parameter
State-Changed-From-To: open->closed
State-Changed-By: sayle
State-Changed-When: Fri May 24 10:01:20 2002
State-Changed-Why:
I've now confirmed that this PR has been fixed for 3.1.1
by the recent backport of Jan Hubicka's memset patch from
mainline to the branch. The appropriate Changelog entry is:
Wed May 22 14:16:07 CEST 2002 Jan Hubicka <jh@suse.cz>
* i386.c (expand_movstr, expand_clrstr): Fix inline-all-stringops
sequence.
(ix86_expand_clrstr): Fix typo.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6703
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: optimization/6703: optimized memset fills incorrect number of bytes for void** parameter
@ 2002-05-20 3:06 Glen Nakamura
0 siblings, 0 replies; 4+ messages in thread
From: Glen Nakamura @ 2002-05-20 3:06 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR optimization/6703; it has been noted by GNATS.
From: Glen Nakamura <glen@imodulo.com>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
dbaron@fas.harvard.edu, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:
Subject: Re: optimization/6703: optimized memset fills incorrect number of bytes for void** parameter
Date: Mon, 20 May 2002 00:04:15 -1000
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6703
Grrr! Sorry, mailer mangled the patch...
ChangeLog
===================================================================
Tue Apr 23 14:24:25 CEST 2002 Jan Hubicka <jh@suse.cz>
* i386.c (ix86_expand_clrstr): Fix typo.
Index: i386.c
===================================================================
RCS file: /cvsroot/gcc/gcc/gcc/config/i386/i386.c,v
retrieving revision 1.368.2.9
diff -c -3 -p -r1.368.2.9 i386.c
*** i386.c 23 Apr 2002 08:11:22 -0000 1.368.2.9
--- i386.c 20 May 2002 09:30:28 -0000
*************** ix86_expand_clrstr (src, count_exp, alig
*** 9420,9426 ****
gen_rtx_SUBREG (SImode, zeroreg, 0)));
if (TARGET_64BIT && (align <= 4 || count == 0))
{
! rtx label = ix86_expand_aligntest (destreg, 2);
emit_insn (gen_strsetsi (destreg,
gen_rtx_SUBREG (SImode, zeroreg, 0)));
emit_label (label);
--- 9420,9426 ----
gen_rtx_SUBREG (SImode, zeroreg, 0)));
if (TARGET_64BIT && (align <= 4 || count == 0))
{
! rtx label = ix86_expand_aligntest (countreg, 2);
emit_insn (gen_strsetsi (destreg,
gen_rtx_SUBREG (SImode, zeroreg, 0)));
emit_label (label);
*************** ix86_expand_clrstr (src, count_exp, alig
*** 9431,9437 ****
gen_rtx_SUBREG (HImode, zeroreg, 0)));
if (align <= 2 || count == 0)
{
! rtx label = ix86_expand_aligntest (destreg, 2);
emit_insn (gen_strsethi (destreg,
gen_rtx_SUBREG (HImode, zeroreg, 0)));
emit_label (label);
--- 9431,9437 ----
gen_rtx_SUBREG (HImode, zeroreg, 0)));
if (align <= 2 || count == 0)
{
! rtx label = ix86_expand_aligntest (countreg, 2);
emit_insn (gen_strsethi (destreg,
gen_rtx_SUBREG (HImode, zeroreg, 0)));
emit_label (label);
*************** ix86_expand_clrstr (src, count_exp, alig
*** 9442,9448 ****
gen_rtx_SUBREG (QImode, zeroreg, 0)));
if (align <= 1 || count == 0)
{
! rtx label = ix86_expand_aligntest (destreg, 1);
emit_insn (gen_strsetqi (destreg,
gen_rtx_SUBREG (QImode, zeroreg, 0)));
emit_label (label);
--- 9442,9448 ----
gen_rtx_SUBREG (QImode, zeroreg, 0)));
if (align <= 1 || count == 0)
{
! rtx label = ix86_expand_aligntest (countreg, 1);
emit_insn (gen_strsetqi (destreg,
gen_rtx_SUBREG (QImode, zeroreg, 0)));
emit_label (label);
^ permalink raw reply [flat|nested] 4+ messages in thread
* optimization/6703: optimized memset fills incorrect number of bytes for void** parameter
@ 2002-05-17 10:56 dbaron
0 siblings, 0 replies; 4+ messages in thread
From: dbaron @ 2002-05-17 10:56 UTC (permalink / raw)
To: gcc-gnats
>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 <string.h>
#include <stdio.h>
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"
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2002-05-24 17:01 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2002-05-20 2:56 optimization/6703: optimized memset fills incorrect number of bytes for void** parameter Glen Nakamura
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2002-05-24 10:16 sayle
2002-05-20 3:06 Glen Nakamura
2002-05-17 10:56 dbaron
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