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* [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O
@ 2005-01-06 19:18 falk at debian dot org
2005-01-06 19:40 ` [Bug middle-end/19296] [3.3/3.4/4.0 " pinskia at gcc dot gnu dot org
` (10 more replies)
0 siblings, 11 replies; 12+ messages in thread
From: falk at debian dot org @ 2005-01-06 19:18 UTC (permalink / raw)
To: gcc-bugs
[forwarded from http://bugs.debian.org/288721]
This fails with 3.3.5 at -O and higher. Regression from 2.95. Also doesn't fail
on MIPS or Alpha. Debian 3.4.4 20041218 is OK.
void abort(void);
__attribute__((noinline)) void f(unsigned short ad) {
if (ad >= 0x4000 && ad < 0xc000)
abort();
}
int main(void) {
f(0xff00);
return 0;
}
--
Summary: [3.3 regression] Range check on short miscompiled at -O
Product: gcc
Version: 3.3.5
Status: UNCONFIRMED
Keywords: wrong-code
Severity: critical
Priority: P2
Component: rtl-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: falk at debian dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i386-linux
GCC host triplet: i386-linux
GCC target triplet: i386-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
@ 2005-01-06 19:40 ` pinskia at gcc dot gnu dot org
2005-01-06 20:37 ` ebotcazou at gcc dot gnu dot org
` (9 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-01-06 19:40 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-06 19:40 -------
It also fails with last nights build of gcc of the mainline.
And 3.4.0, 3.3.3, 3.2.3 and 3.0.4.
Here is a testcase which also fails too (this is what fold does):
void abort ();
void f1(unsigned short ad)
{
if ((short int) (ad - 16384) >= 0)
abort ();
}
int main (void)
{
f1(0xff00);
return 0;
}
The RTL is wrong right away:
(insn 13 11 14 (set (reg:HI 60)
(subreg/u:HI (reg/v:SI 58 [ ad ]) 0)) -1 (nil)
(nil))
(insn 14 13 15 (parallel [
(set (reg:SI 61)
(plus:SI (subreg:SI (reg:HI 60) 0)
(const_int -16384 [0xffffc000])))
(clobber (reg:CC 17 flags))
]) -1 (nil)
(nil))
(insn 15 14 16 (set (reg:CCGOC 17 flags)
(compare:CCGOC (subreg:HI (reg:SI 61) 0)
(const_int 0 [0x0]))) -1 (nil)
(nil))
(jump_insn 16 15 0 (set (pc)
(if_then_else (lt (reg:CCGOC 17 flags)
(const_int 0 [0x0]))
(label_ref 0)
(pc))) -1 (nil)
(expr_list:REG_BR_PROB (const_int 9900 [0x26ac])
(nil)))
on PPC we get:
(insn 11 9 12 (set (reg:HI 119)
(subreg/u:HI (reg/v:SI 118 [ ad ]) 2)) -1 (nil)
(nil))
(insn 12 11 13 (set (reg:SI 120)
(plus:SI (subreg:SI (reg:HI 119) 0)
(const_int -16384 [0xffffffffffffc000]))) -1 (nil)
(nil))
(insn 13 12 14 (set (reg:SI 121)
(sign_extend:SI (subreg:HI (reg:SI 120) 2))) -1 (nil)
(nil))
(insn 14 13 15 (set (reg:CC 122)
(compare:CC (reg:SI 121)
(const_int 0 [0x0]))) -1 (nil)
(nil))
(jump_insn 15 14 0 (set (pc)
(if_then_else (lt (reg:CC 122)
(const_int 0 [0x0]))
(label_ref 0)
(pc))) -1 (nil)
(expr_list:REG_BR_PROB (const_int 9900 [0x26ac])
(nil)))
Notice the sign_extend in the PPC but not in the x86 case.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Component|rtl-optimization |middle-end
Ever Confirmed| |1
GCC build triplet|i386-linux |
GCC host triplet|i386-linux |
Known to fail| |3.4.0 4.0.0 3.0.4 3.2.3
| |3.3.3
Known to work| |2.95.3
Last reconfirmed|0000-00-00 00:00:00 |2005-01-06 19:40:30
date| |
Summary|[3.3 regression] Range check|[3.3/3.4/4.0 regression]
|on short miscompiled at -O |Range check on short
| |miscompiled at -O
Target Milestone|--- |3.4.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
2005-01-06 19:40 ` [Bug middle-end/19296] [3.3/3.4/4.0 " pinskia at gcc dot gnu dot org
@ 2005-01-06 20:37 ` ebotcazou at gcc dot gnu dot org
2005-01-06 20:56 ` ebotcazou at gcc dot gnu dot org
` (8 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2005-01-06 20:37 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From ebotcazou at gcc dot gnu dot org 2005-01-06 20:37 -------
It only fails on i686, neither on i386 nor i586.
--
What |Removed |Added
----------------------------------------------------------------------------
GCC target triplet|i386-linux |i686-linux
Known to fail|3.4.0 4.0.0 3.0.4 3.2.3 |3.4.0 3.4.4 4.0.0 3.0.4
|3.3.3 |3.2.3 3.3.3 3.3.6
Last reconfirmed|2005-01-06 19:40:30 |2005-01-06 20:37:10
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
2005-01-06 19:40 ` [Bug middle-end/19296] [3.3/3.4/4.0 " pinskia at gcc dot gnu dot org
2005-01-06 20:37 ` ebotcazou at gcc dot gnu dot org
@ 2005-01-06 20:56 ` ebotcazou at gcc dot gnu dot org
2005-01-06 22:25 ` ebotcazou at gcc dot gnu dot org
` (7 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2005-01-06 20:56 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From ebotcazou at gcc dot gnu dot org 2005-01-06 20:56 -------
Investigating.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |ebotcazou at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug middle-end/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
` (2 preceding siblings ...)
2005-01-06 20:56 ` ebotcazou at gcc dot gnu dot org
@ 2005-01-06 22:25 ` ebotcazou at gcc dot gnu dot org
2005-01-07 0:46 ` [Bug rtl-optimization/19296] " ebotcazou at gcc dot gnu dot org
` (6 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2005-01-06 22:25 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From ebotcazou at gcc dot gnu dot org 2005-01-06 22:24 -------
> The RTL is wrong right away:
> (insn 13 11 14 (set (reg:HI 60)
> (subreg/u:HI (reg/v:SI 58 [ ad ]) 0)) -1 (nil)
> (nil))
>
> (insn 14 13 15 (parallel [
> (set (reg:SI 61)
> (plus:SI (subreg:SI (reg:HI 60) 0)
> (const_int -16384 [0xffffc000])))
> (clobber (reg:CC 17 flags))
> ]) -1 (nil)
> (nil))
>
> (insn 15 14 16 (set (reg:CCGOC 17 flags)
> (compare:CCGOC (subreg:HI (reg:SI 61) 0)
> (const_int 0 [0x0]))) -1 (nil)
> (nil))
>
> (jump_insn 16 15 0 (set (pc)
> (if_then_else (lt (reg:CCGOC 17 flags)
> (const_int 0 [0x0]))
> (label_ref 0)
> (pc))) -1 (nil)
> (expr_list:REG_BR_PROB (const_int 9900 [0x26ac])
> (nil)))
I don't think the initial RTL is wrong: note that, while we perform the addition
in SImode, we still compare in HImode. The problem appears to come from the
combiner, which gets rid of the HImode in the comparison.
> on PPC we get:
> (insn 11 9 12 (set (reg:HI 119)
> (subreg/u:HI (reg/v:SI 118 [ ad ]) 2)) -1 (nil)
> (nil))
>
> (insn 12 11 13 (set (reg:SI 120)
> (plus:SI (subreg:SI (reg:HI 119) 0)
> (const_int -16384 [0xffffffffffffc000]))) -1 (nil)
> (nil))
>
> (insn 13 12 14 (set (reg:SI 121)
> (sign_extend:SI (subreg:HI (reg:SI 120) 2))) -1 (nil)
> (nil))
>
> (insn 14 13 15 (set (reg:CC 122)
> (compare:CC (reg:SI 121)
> (const_int 0 [0x0]))) -1 (nil)
> (nil))
>
> (jump_insn 15 14 0 (set (pc)
> (if_then_else (lt (reg:CC 122)
> (const_int 0 [0x0]))
> (label_ref 0)
> (pc))) -1 (nil)
> (expr_list:REG_BR_PROB (const_int 9900 [0x26ac])
> (nil)))
>
>
> Notice the sign_extend in the PPC but not in the x86 case.
This RTL is indeed more elegant and probably less error-prone.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
` (3 preceding siblings ...)
2005-01-06 22:25 ` ebotcazou at gcc dot gnu dot org
@ 2005-01-07 0:46 ` ebotcazou at gcc dot gnu dot org
2005-01-08 16:07 ` debian-gcc at lists dot debian dot org
` (5 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2005-01-07 0:46 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From ebotcazou at gcc dot gnu dot org 2005-01-07 00:46 -------
Confirmed, it's the combiner optimistically getting rid of the HImode subreg.
--
What |Removed |Added
----------------------------------------------------------------------------
Component|middle-end |rtl-optimization
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
` (4 preceding siblings ...)
2005-01-07 0:46 ` [Bug rtl-optimization/19296] " ebotcazou at gcc dot gnu dot org
@ 2005-01-08 16:07 ` debian-gcc at lists dot debian dot org
2005-01-09 2:12 ` pinskia at gcc dot gnu dot org
` (4 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: debian-gcc at lists dot debian dot org @ 2005-01-08 16:07 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From debian-gcc at lists dot debian dot org 2005-01-08 16:07 -------
[add reference to http://bugs.debian.org/288721]
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |debian-gcc at lists dot
| |debian dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
` (5 preceding siblings ...)
2005-01-08 16:07 ` debian-gcc at lists dot debian dot org
@ 2005-01-09 2:12 ` pinskia at gcc dot gnu dot org
2005-01-18 8:26 ` cvs-commit at gcc dot gnu dot org
` (3 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-01-09 2:12 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-09 02:12 -------
Patch here: <http://gcc.gnu.org/ml/gcc-patches/2005-01/msg00464.html>.
--
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
` (6 preceding siblings ...)
2005-01-09 2:12 ` pinskia at gcc dot gnu dot org
@ 2005-01-18 8:26 ` cvs-commit at gcc dot gnu dot org
2005-01-18 8:33 ` cvs-commit at gcc dot gnu dot org
` (2 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-01-18 8:26 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-01-18 08:26 -------
Subject: Bug 19296
CVSROOT: /cvs/gcc
Module name: gcc
Changes by: ebotcazou@gcc.gnu.org 2005-01-18 08:26:21
Modified files:
gcc : ChangeLog combine.c
gcc/testsuite : ChangeLog
Added files:
gcc/testsuite/gcc.dg: short-compare-1.c short-compare-2.c
Log message:
PR rtl-optimization/19296
* combine.c (simplify_comparison): Rewrite the condition under
which a non-paradoxical SUBREG of a PLUS can be lifted when
compared against a constant.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.7168&r2=2.7169
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/combine.c.diff?cvsroot=gcc&r1=1.466&r2=1.467
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.4901&r2=1.4902
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/short-compare-1.c.diff?cvsroot=gcc&r1=NONE&r2=1.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/short-compare-2.c.diff?cvsroot=gcc&r1=NONE&r2=1.1
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
` (7 preceding siblings ...)
2005-01-18 8:26 ` cvs-commit at gcc dot gnu dot org
@ 2005-01-18 8:33 ` cvs-commit at gcc dot gnu dot org
2005-01-18 8:40 ` cvs-commit at gcc dot gnu dot org
2005-01-18 8:41 ` ebotcazou at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-01-18 8:33 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-01-18 08:33 -------
Subject: Bug 19296
CVSROOT: /cvs/gcc
Module name: gcc
Branch: gcc-3_4-branch
Changes by: ebotcazou@gcc.gnu.org 2005-01-18 08:33:28
Modified files:
gcc : ChangeLog combine.c
gcc/testsuite : ChangeLog
Added files:
gcc/testsuite/gcc.dg: short-compare-1.c short-compare-2.c
Log message:
PR rtl-optimization/19296
* combine.c (simplify_comparison): Rewrite the condition under
which a non-paradoxical SUBREG of a PLUS can be lifted when
compared against a constant.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=2.2326.2.775&r2=2.2326.2.776
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/combine.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.400.4.11&r2=1.400.4.12
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.3389.2.344&r2=1.3389.2.345
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/short-compare-1.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=NONE&r2=1.1.2.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/short-compare-2.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=NONE&r2=1.1.2.1
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
` (8 preceding siblings ...)
2005-01-18 8:33 ` cvs-commit at gcc dot gnu dot org
@ 2005-01-18 8:40 ` cvs-commit at gcc dot gnu dot org
2005-01-18 8:41 ` ebotcazou at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-01-18 8:40 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-01-18 08:39 -------
Subject: Bug 19296
CVSROOT: /cvs/gcc
Module name: gcc
Branch: gcc-3_3-branch
Changes by: ebotcazou@gcc.gnu.org 2005-01-18 08:39:30
Modified files:
gcc : ChangeLog combine.c
gcc/testsuite : ChangeLog
Added files:
gcc/testsuite/gcc.dg: short-compare-1.c short-compare-2.c
Log message:
PR rtl-optimization/19296
* combine.c (simplify_comparison): Rewrite the condition under
which a non-paradoxical SUBREG of a PLUS can be lifted when
compared against a constant.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.16114.2.1052&r2=1.16114.2.1053
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/combine.c.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.325.2.18&r2=1.325.2.19
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.2261.2.395&r2=1.2261.2.396
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/short-compare-1.c.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=NONE&r2=1.1.4.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/short-compare-2.c.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=NONE&r2=1.1.4.1
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/19296] [3.3/3.4/4.0 regression] Range check on short miscompiled at -O
2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
` (9 preceding siblings ...)
2005-01-18 8:40 ` cvs-commit at gcc dot gnu dot org
@ 2005-01-18 8:41 ` ebotcazou at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2005-01-18 8:41 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From ebotcazou at gcc dot gnu dot org 2005-01-18 08:41 -------
Patch applied.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
Target Milestone|3.4.4 |3.3.6
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19296
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2005-01-18 8:41 UTC | newest]
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2005-01-06 19:18 [Bug rtl-optimization/19296] New: [3.3 regression] Range check on short miscompiled at -O falk at debian dot org
2005-01-06 19:40 ` [Bug middle-end/19296] [3.3/3.4/4.0 " pinskia at gcc dot gnu dot org
2005-01-06 20:37 ` ebotcazou at gcc dot gnu dot org
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2005-01-07 0:46 ` [Bug rtl-optimization/19296] " ebotcazou at gcc dot gnu dot org
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2005-01-09 2:12 ` pinskia at gcc dot gnu dot org
2005-01-18 8:26 ` cvs-commit at gcc dot gnu dot org
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