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* [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass
@ 2021-02-05 9:10 krebbel at gcc dot gnu.org
2021-02-05 9:15 ` [Bug rtl-optimization/98973] " rguenth at gcc dot gnu.org
` (15 more replies)
0 siblings, 16 replies; 17+ messages in thread
From: krebbel at gcc dot gnu.org @ 2021-02-05 9:10 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
Bug ID: 98973
Summary: [11 regression] Wrong code with gcse store motion pass
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: krebbel at gcc dot gnu.org
Target Milestone: ---
This test aborts when compiled on IBM Z with:
gcc -O3 t.c -o t -fgcse-sm
it succeeds with -O2 or without -fgcse-sm
Tested with Commit ID: 072f20c5559
It works with GCC 10 branch: eb15f761bc7
long a;
int b, c;
short d;
int e[] = { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1 };
void
f ()
{
g:
c = 9;
for (; c >= 3; c--)
{
int h[5];
for (; d; d--)
;
for (; a;)
if (e[c])
b = h[4];
if (e[c])
continue;
goto g;
}
}
int
main ()
{
f ();
if (c != 2)
__builtin_abort();
}
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
@ 2021-02-05 9:15 ` rguenth at gcc dot gnu.org
2021-02-05 10:02 ` krebbel at gcc dot gnu.org
` (14 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-02-05 9:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |11.0
Keywords| |wrong-code
Target Milestone|--- |11.0
Known to work| |10.2.1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
works on x86_64. Can you point out the bogus transform done by GCSE?
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
2021-02-05 9:15 ` [Bug rtl-optimization/98973] " rguenth at gcc dot gnu.org
@ 2021-02-05 10:02 ` krebbel at gcc dot gnu.org
2021-02-05 10:03 ` krebbel at gcc dot gnu.org
` (13 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: krebbel at gcc dot gnu.org @ 2021-02-05 10:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
--- Comment #2 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
Created attachment 50130
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50130&action=edit
RTL GCSE dump with -fgcse-sm
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
2021-02-05 9:15 ` [Bug rtl-optimization/98973] " rguenth at gcc dot gnu.org
2021-02-05 10:02 ` krebbel at gcc dot gnu.org
@ 2021-02-05 10:03 ` krebbel at gcc dot gnu.org
2021-02-05 10:04 ` krebbel at gcc dot gnu.org
` (12 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: krebbel at gcc dot gnu.org @ 2021-02-05 10:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
--- Comment #3 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
Created attachment 50131
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50131&action=edit
RTL GCSE dump without -fgcse-sm
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (2 preceding siblings ...)
2021-02-05 10:03 ` krebbel at gcc dot gnu.org
@ 2021-02-05 10:04 ` krebbel at gcc dot gnu.org
2021-02-05 10:11 ` krebbel at gcc dot gnu.org
` (11 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: krebbel at gcc dot gnu.org @ 2021-02-05 10:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
--- Comment #4 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
The update of global variable c is moved out of the loop. Due to that c stays
at 8 although it should be counted down to 2.
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (3 preceding siblings ...)
2021-02-05 10:04 ` krebbel at gcc dot gnu.org
@ 2021-02-05 10:11 ` krebbel at gcc dot gnu.org
2021-02-05 11:54 ` rguenth at gcc dot gnu.org
` (10 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: krebbel at gcc dot gnu.org @ 2021-02-05 10:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
--- Comment #5 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
Created attachment 50132
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50132&action=edit
RTL dump from store motion pass
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (4 preceding siblings ...)
2021-02-05 10:11 ` krebbel at gcc dot gnu.org
@ 2021-02-05 11:54 ` rguenth at gcc dot gnu.org
2021-02-05 12:19 ` jakub at gcc dot gnu.org
` (9 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-02-05 11:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, -fgcse-sm is nowhere enabled by default (same applies to -fgcse-las), we
should consider removing these optimizations (though -fgcse-las at least sounds
useful and I wonder why it is not enabled). GCSE store-motion should be
re-implemented on GIMPLE, replacing the sink pass (there were previous
attempts in implementing SSU-PRE).
A comment in store-motion.c claims
/* This pass implements downward store motion.
As of May 1, 2009, the pass is not enabled by default on any target,
but bootstrap completes on ia64 and x86_64 with the pass enabled. */
I'm trying if enabling it by default still bootstraps & tests OK on x86-64
(also enabling gcse-las at the same time..)
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (5 preceding siblings ...)
2021-02-05 11:54 ` rguenth at gcc dot gnu.org
@ 2021-02-05 12:19 ` jakub at gcc dot gnu.org
2021-02-05 12:39 ` rguenth at gcc dot gnu.org
` (8 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-02-05 12:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r11-4122-g06729598b0dc10dbe60545f21c2214ad66a5a3db
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (6 preceding siblings ...)
2021-02-05 12:19 ` jakub at gcc dot gnu.org
@ 2021-02-05 12:39 ` rguenth at gcc dot gnu.org
2021-02-26 12:51 ` rguenth at gcc dot gnu.org
` (7 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-02-05 12:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #6)
> Btw, -fgcse-sm is nowhere enabled by default (same applies to -fgcse-las),
> we should consider removing these optimizations (though -fgcse-las at least
> sounds
> useful and I wonder why it is not enabled). GCSE store-motion should be
> re-implemented on GIMPLE, replacing the sink pass (there were previous
> attempts in implementing SSU-PRE).
>
> A comment in store-motion.c claims
>
> /* This pass implements downward store motion.
> As of May 1, 2009, the pass is not enabled by default on any target,
> but bootstrap completes on ia64 and x86_64 with the pass enabled. */
>
> I'm trying if enabling it by default still bootstraps & tests OK on x86-64
> (also enabling gcse-las at the same time..)
It does. Extra FAILs are
FAIL: c-c++-common/guality/Og-dce-2.c -Og line 17 ptr->a == 1
FAIL: c-c++-common/guality/Og-dce-2.c -Og -flto line 17 ptr->a == 1
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (7 preceding siblings ...)
2021-02-05 12:39 ` rguenth at gcc dot gnu.org
@ 2021-02-26 12:51 ` rguenth at gcc dot gnu.org
2021-04-09 8:16 ` rguenth at gcc dot gnu.org
` (6 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-02-26 12:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, this is likely a latent issue, the store-motion code didn't change since
ages and the bisected rev. likely just changed the input to the pass.
So the dump difference is
-(note 76 75 217 19 [bb 19] NOTE_INSN_BASIC_BLOCK)
-(insn 217 76 78 19 (set (reg:SI 3 %r3 [133])
- (reg:SI 2 %r2 [orig:69 ivtmp.24+4 ] [69])) "t.c":11:19 1467
{*movsi_zarch}
- (nil))
-(insn 78 217 218 19 (parallel [
- (set (reg:SI 3 %r3 [133])
- (plus:SI (reg:SI 3 %r3 [133])
- (const_int -1 [0xffffffffffffffff])))
- (clobber (reg:CC 33 %cc))
- ]) "t.c":11:19 1821 {*addsi3}
- (nil))
-(insn 218 78 79 19 (set (mem/c:SI (reg/f:DI 8 %r8 [103]) [1 c+0 S4 A32])
- (reg:SI 3 %r3 [133])) "t.c":11:19 1467 {*movsi_zarch}
- (nil))
-(insn 79 218 83 19 (parallel [
- (set (reg:DI 2 %r2 [orig:69 ivtmp.24 ] [69])
- (plus:DI (reg:DI 2 %r2 [orig:69 ivtmp.24 ] [69])
+(note 76 75 79 19 [bb 19] NOTE_INSN_BASIC_BLOCK)
+(insn 79 76 83 19 (parallel [
+ (set (reg:DI 3 %r3 [orig:69 ivtmp.24 ] [69])
+ (plus:DI (reg:DI 3 %r3 [orig:69 ivtmp.24 ] [69])
(const_int -1 [0xffffffffffffffff])))
(clobber (reg:CC 33 %cc))
]) "t.c":11:12 1820 {*adddi3}
(nil))
(insn 83 79 84 19 (set (reg:CCS 33 %cc)
- (compare:CCS (reg:SI 2 %r2 [orig:69 ivtmp.24+4 ] [69])
+ (compare:CCS (reg:SI 3 %r3 [orig:69 ivtmp.24+4 ] [69])
(const_int 2 [0x2]))) "t.c":11:12 1415 {*cmpsi_ccs}
where you can see that %r2 is no longer decremented but the store
(sunk) after the loop still uses %r2:
(insn 175 105 218 23 (set (mem/c:SI (reg/f:DI 8 %r8 [103]) [1 c+0 S4 A32])
(reg:SI 2 %r2 [orig:110 c ] [110])) 1467 {*movsi_zarch}
(nil))
--
scanning new insn with uid = 175.
STORE_MOTION insert store at start of BB 26:
(insn 175 105 0 26 (set (mem/c:SI (reg/f:DI 103) [1 c+0 S4 A32])
(reg:SI 110 [ c ])) -1
(nil))
I'll note the gcse dumps are after RA but the store-motion dump is pre-RA.
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (8 preceding siblings ...)
2021-02-26 12:51 ` rguenth at gcc dot gnu.org
@ 2021-04-09 8:16 ` rguenth at gcc dot gnu.org
2021-04-12 13:16 ` ebotcazou at gcc dot gnu.org
` (5 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-04-09 8:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ebotcazou at gcc dot gnu.org,
| |law at gcc dot gnu.org,
| |stevenb.gcc at gmail dot com
Status|UNCONFIRMED |NEW
Priority|P3 |P2
Ever confirmed|0 |1
Last reconfirmed| |2021-04-09
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. P2 because it's surely latent and nobody seems interested in
maintaining store-motion (which I think could morph into a more general
sinking facility on RTL). I'm not even sure who knows the original gcse code
well (it was split up by Steven).
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (9 preceding siblings ...)
2021-04-09 8:16 ` rguenth at gcc dot gnu.org
@ 2021-04-12 13:16 ` ebotcazou at gcc dot gnu.org
2021-04-13 15:58 ` law at gcc dot gnu.org
` (4 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2021-04-12 13:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
--- Comment #11 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
I don't seem to be able to reproduce with a cross. Can you post the configure
line for the compiler?
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (10 preceding siblings ...)
2021-04-12 13:16 ` ebotcazou at gcc dot gnu.org
@ 2021-04-13 15:58 ` law at gcc dot gnu.org
2021-04-27 11:40 ` [Bug rtl-optimization/98973] [11/12 " jakub at gcc dot gnu.org
` (3 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: law at gcc dot gnu.org @ 2021-04-13 15:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
--- Comment #12 from Jeffrey A. Law <law at gcc dot gnu.org> ---
IIRC LSM is quite restricted in the types of MEM expressions it will optimize.
In particular I think they have to be SYMBOL_REFs which severely limits LSM's
effectiveness.
I would support removing it given that it's not enabled by default anywhere and
is of limited utility.
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11/12 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (11 preceding siblings ...)
2021-04-13 15:58 ` law at gcc dot gnu.org
@ 2021-04-27 11:40 ` jakub at gcc dot gnu.org
2021-07-28 7:05 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-04-27 11:40 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|11.0 |11.2
--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 11.1 has been released, retargeting bugs to GCC 11.2.
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11/12 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (12 preceding siblings ...)
2021-04-27 11:40 ` [Bug rtl-optimization/98973] [11/12 " jakub at gcc dot gnu.org
@ 2021-07-28 7:05 ` rguenth at gcc dot gnu.org
2022-04-21 7:48 ` rguenth at gcc dot gnu.org
2023-05-29 10:04 ` [Bug rtl-optimization/98973] [11/12/13/14 " jakub at gcc dot gnu.org
15 siblings, 0 replies; 17+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-07-28 7:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|11.2 |11.3
--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 11.2 is being released, retargeting bugs to GCC 11.3
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11/12 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (13 preceding siblings ...)
2021-07-28 7:05 ` rguenth at gcc dot gnu.org
@ 2022-04-21 7:48 ` rguenth at gcc dot gnu.org
2023-05-29 10:04 ` [Bug rtl-optimization/98973] [11/12/13/14 " jakub at gcc dot gnu.org
15 siblings, 0 replies; 17+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-04-21 7:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|11.3 |11.4
--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 11.3 is being released, retargeting bugs to GCC 11.4.
^ permalink raw reply [flat|nested] 17+ messages in thread
* [Bug rtl-optimization/98973] [11/12/13/14 regression] Wrong code with gcse store motion pass
2021-02-05 9:10 [Bug rtl-optimization/98973] New: [11 regression] Wrong code with gcse store motion pass krebbel at gcc dot gnu.org
` (14 preceding siblings ...)
2022-04-21 7:48 ` rguenth at gcc dot gnu.org
@ 2023-05-29 10:04 ` jakub at gcc dot gnu.org
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu.org @ 2023-05-29 10:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98973
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|11.4 |11.5
--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 11.4 is being released, retargeting bugs to GCC 11.5.
^ permalink raw reply [flat|nested] 17+ messages in thread
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