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* other/7814: incorrect scheduling for glibc-2.2.92 stpcpy test
@ 2002-09-02 12:26 glen
0 siblings, 0 replies; 3+ messages in thread
From: glen @ 2002-09-02 12:26 UTC (permalink / raw)
To: gcc-gnats
>Number: 7814
>Category: other
>Synopsis: incorrect scheduling for glibc-2.2.92 stpcpy test
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Mon Sep 02 12:26:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: glibc-2.2.92 testsuite
>Release: gcc 3.2
>Organization:
>Environment:
i586-pc-linux-gnu
>Description:
GCC incorrectly generates scheduling dependencies...
test_stpcpy:
pushl %ebp
movl %esp, %ebp
pushl %edi
pushl %esi
movl $1, %esi
pushl %ebx
movl $one, %ebx
subl %ebx, %esi
subl $20, %esp
movl $.LC2, it
leal (%ebx,%esi), %edi
pushl $1
cmpl $1, %edi
addl $one+2, %esi << incorrectly clobbers CC
sete %al
andl $255, %eax
pushl %eax
movw $97, one
call check
addl $12, %esp
>How-To-Repeat:
bash:~# gcc -O2 -mcpu=i586 stpcpy.i
bash:~# ./a.out
stpcpy flunked test 1
1 errors.
>Fix:
I'm testing a patch to sched-deps.c which I'll post soon.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
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Content-Disposition: attachment; filename="stpcpy.i"
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: other/7814: incorrect scheduling for glibc-2.2.92 stpcpy test
@ 2002-09-02 13:26 Glen Nakamura
0 siblings, 0 replies; 3+ messages in thread
From: Glen Nakamura @ 2002-09-02 13:26 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR other/7814; it has been noted by GNATS.
From: Glen Nakamura <glen@imodulo.com>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org
Cc:
Subject: Re: other/7814: incorrect scheduling for glibc-2.2.92 stpcpy test
Date: Mon, 2 Sep 2002 10:24:48 -1000
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7814
Okay, I think the problem is that when we flush the dependency lists
(e.g. when ?_length > MAX_PENDING_LIST_LENGTH), we end up with a single
insn in the 'clobbers' list while the 'sets' and 'uses' lists are empty.
Now, if there is another clobber insn before any set or use insn, it won't
be dependent on any previous insn because the 'sets' and 'uses' lists
are empty... The problem is fixed by adding the last insn to the 'sets'
list after flushing.
- glen
Here is the patch:
ChangeLog
===================================================================
2002-09-02 Glen Nakamura <glen@imodulo.com>
* sched-deps.c (sched_analyze_insn): Make sure to add insn
to reg_last->sets after flushing the dependency lists to guarantee
that subsequent clobbers will be dependent on it.
Index: sched-deps.c
===================================================================
RCS file: /cvsroot/gcc/gcc/gcc/sched-deps.c,v
retrieving revision 1.34.6.1
diff -c -3 -p -u -r1.34.6.1 sched-deps.c
--- sched-deps.c 19 Aug 2002 18:59:31 -0000 1.34.6.1
+++ sched-deps.c 2 Sep 2002 06:35:15 -0000
@@ -1118,8 +1118,6 @@ sched_analyze_insn (deps, x, insn, loop_
EXECUTE_IF_SET_IN_REG_SET (reg_pending_clobbers, 0, i,
{
struct deps_reg *reg_last = &deps->reg_last[i];
- add_dependence_list (insn, reg_last->sets, REG_DEP_OUTPUT);
- add_dependence_list (insn, reg_last->uses, REG_DEP_ANTI);
if (reg_last->uses_length > MAX_PENDING_LIST_LENGTH
|| reg_last->clobbers_length > MAX_PENDING_LIST_LENGTH)
{
@@ -1129,6 +1127,7 @@ sched_analyze_insn (deps, x, insn, loop_
REG_DEP_ANTI);
add_dependence_list_and_free (insn, ®_last->clobbers,
REG_DEP_OUTPUT);
+ reg_last->sets = alloc_INSN_LIST (insn, reg_last->sets);
reg_last->clobbers_length = 0;
reg_last->uses_length = 0;
}
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: other/7814: incorrect scheduling for glibc-2.2.92 stpcpy test
@ 2002-09-02 12:46 Glen Nakamura
0 siblings, 0 replies; 3+ messages in thread
From: Glen Nakamura @ 2002-09-02 12:46 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR other/7814; it has been noted by GNATS.
From: Glen Nakamura <glen@imodulo.com>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org
Cc:
Subject: Re: other/7814: incorrect scheduling for glibc-2.2.92 stpcpy test
Date: Mon, 2 Sep 2002 09:36:09 -1000
--J2SCkAp4GZ/dPZZf
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Hmm, I intended to file this under optimization, but I must have selected
other by mistake... *grr* Anyway, here is the C source for the uploaded
testcase.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7814
--J2SCkAp4GZ/dPZZf
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename="stpcpy.c"
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
const char *it = "<UNSET>"; /* Routine name for message routines. */
size_t errors = 0;
/* Complain if condition is not true. */
static void
check (int thing, int number)
{
if (!thing)
{
printf("%s flunked test %d\n", it, number);
++errors;
}
}
/* Complain if first two args don't strcmp as equal. */
static void
equal (const char *a, const char *b, int number)
{
check(a != NULL && b != NULL && (strcmp (a, b) == 0), number);
}
char one[50];
char two[50];
char *cp;
#undef __stpcpy
# define __stpcpy(dest, src) \
(__extension__ (__builtin_constant_p (src) \
? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8 \
? __builtin_strcpy (dest, src) + strlen (src) \
: ((char *) (__mempcpy) (dest, src, strlen (src) + 1) \
- 1)) \
: __stpcpy (dest, src)))
static void
test_stpcpy (void)
{
it = "stpcpy";
check ((stpcpy (one, "a") - one) == 1, 1);
equal (one, "a", 2);
check ((stpcpy (one, "ab") - one) == 2, 3);
equal (one, "ab", 4);
check ((stpcpy (one, "abc") - one) == 3, 5);
equal (one, "abc", 6);
check ((stpcpy (one, "abcd") - one) == 4, 7);
equal (one, "abcd", 8);
check ((stpcpy (one, "abcde") - one) == 5, 9);
equal (one, "abcde", 10);
check ((stpcpy (one, "abcdef") - one) == 6, 11);
equal (one, "abcdef", 12);
check ((stpcpy (one, "abcdefg") - one) == 7, 13);
equal (one, "abcdefg", 14);
check ((stpcpy (one, "abcdefgh") - one) == 8, 15);
equal (one, "abcdefgh", 16);
check ((stpcpy (one, "abcdefghi") - one) == 9, 17);
equal (one, "abcdefghi", 18);
check ((stpcpy (one, "x") - one) == 1, 19);
equal (one, "x", 20); /* Writeover. */
equal (one+2, "cdefghi", 21); /* Wrote too much? */
check ((stpcpy (one, "xx") - one) == 2, 22);
equal (one, "xx", 23); /* Writeover. */
equal (one+3, "defghi", 24); /* Wrote too much? */
check ((stpcpy (one, "xxx") - one) == 3, 25);
equal (one, "xxx", 26); /* Writeover. */
equal (one+4, "efghi", 27); /* Wrote too much? */
check ((stpcpy (one, "xxxx") - one) == 4, 28);
equal (one, "xxxx", 29); /* Writeover. */
equal (one+5, "fghi", 30); /* Wrote too much? */
check ((stpcpy (one, "xxxxx") - one) == 5, 31);
equal (one, "xxxxx", 32); /* Writeover. */
equal (one+6, "ghi", 33); /* Wrote too much? */
check ((stpcpy (one, "xxxxxx") - one) == 6, 34);
equal (one, "xxxxxx", 35); /* Writeover. */
equal (one+7, "hi", 36); /* Wrote too much? */
check ((stpcpy (one, "xxxxxxx") - one) == 7, 37);
equal (one, "xxxxxxx", 38); /* Writeover. */
equal (one+8, "i", 39); /* Wrote too much? */
check ((stpcpy (stpcpy (stpcpy (one, "a"), "b"), "c") - one) == 3, 40);
equal (one, "abc", 41);
equal (one + 4, "xxx", 42);
}
int
main (void)
{
int status;
/* A closely related function is stpcpy. */
test_stpcpy ();
if (errors == 0)
{
status = 0;
puts("No errors.");
}
else
{
status = 1;
printf("%Zd errors.\n", errors);
}
return status;
}
--J2SCkAp4GZ/dPZZf--
^ permalink raw reply [flat|nested] 3+ messages in thread
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2002-09-02 12:46 Glen Nakamura
2002-09-02 13:26 Glen Nakamura
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