* [Bug tree-optimization/97236] [10/11 Regression] g:e93428a8b056aed83a7678 triggers vlc miscompile
2020-09-29 7:12 [Bug tree-optimization/97236] New: [10/11 Regression] g:e93428a8b056aed83a7678 triggers vlc miscompile rguenth at gcc dot gnu.org
@ 2020-09-29 7:13 ` rguenth at gcc dot gnu.org
2020-09-29 13:05 ` marxin at gcc dot gnu.org
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To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Target Milestone|--- |10.3
CC| |doko at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Target| |x86_64-*-*
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2020-09-29 7:13 ` [Bug tree-optimization/97236] " rguenth at gcc dot gnu.org
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To: gcc-bugs
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 49287
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49287&action=edit
Reduced test-case
Reduced test-case that started to fail on master with r11-205-gbc484e250990393e
with -O3.
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 49288
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49288&action=edit
Another test-case
Another test-case that started to fail with r10-1361-g9f962469cabc7fdc.
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
Last reconfirmed| |2020-09-29
Status|UNCONFIRMED |NEW
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From: rguenth at gcc dot gnu.org @ 2020-09-29 13:46 UTC (permalink / raw)
To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Status|NEW |ASSIGNED
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
typedef unsigned char __uint8_t;
typedef __uint8_t uint8_t;
typedef struct plane_t {
uint8_t *p_pixels;
int i_lines;
int i_pitch;
} plane_t;
typedef struct {
plane_t p[5];
} picture_t;
#define N 4
void __attribute__((noipa))
picture_Clone(picture_t *picture, picture_t *res)
{
for (int i = 0; i < N; i++) {
res->p[i].p_pixels = picture->p[i].p_pixels;
res->p[i].i_lines = picture->p[i].i_lines;
res->p[i].i_pitch = picture->p[i].i_pitch;
}
}
int
main()
{
picture_t aaa, bbb;
uint8_t pixels[10] = {1, 1, 1, 1, 1, 1, 1, 1};
for (unsigned i = 0; i < N; i++)
aaa.p[i].p_pixels = pixels;
picture_Clone (&aaa, &bbb);
uint8_t c;
for (unsigned i = 0; i < N; i++)
c += bbb.p[i].p_pixels[0];
if (c != N)
__builtin_abort ();
return 0;
}
ends up with a NULL pointer in bb.p[1].p_pixels
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From: rguenth at gcc dot gnu.org @ 2020-09-29 14:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97236
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rsandifo at gcc dot gnu.org
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
So what goes wrong is the single-element interleaving code-gen for the pointer
copy. We have
t.c:18:21: note: Detected single element interleaving
picture_7(D)->p[i_18].p_pixels step 16
but for the store:
t.c:18:21: missed: not consecutive access res_8(D)->p[i_18].p_pixels = _1;
t.c:18:21: note: using strided accesses
...
t.c:18:21: note: ==> examining statement: _1 =
picture_7(D)->p[i_18].p_pixels;
t.c:18:21: note: vect_model_load_cost: aligned.
t.c:18:21: note: vect_model_load_cost: inside_cost = 24, prologue_cost = 0 .
and in group get-load-store type we handle it as (V1DI)
if (!STMT_VINFO_STRIDED_P (first_stmt_info)
&& (can_overrun_p || !would_overrun_p)
&& compare_step_with_zero (vinfo, stmt_info) > 0)
{
/* First cope with the degenerate case of a single-element
vector. */
if (known_eq (TYPE_VECTOR_SUBPARTS (vectype), 1U))
*memory_access_type = VMAT_CONTIGUOUS;
looks like this needs to be conditional on gap == 0? Adding that fixes
the testcase. This was added by g:6737facbb3c53a1f0158b05e4116c161ed9bc319
Richard? It looks like the !STMT_VINFO_STRIDED_P check might have supposed
to prevent this? In vectorizable_load we're also doing
if (memory_access_type == VMAT_GATHER_SCATTER
|| (!slp && memory_access_type == VMAT_CONTIGUOUS))
grouped_load = false;
but vect_transform_grouped_load doesn't like this case, possibly because
there's nothing to "permute" (eliding that alone doesn't fix the code-gen
issue).
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From: rguenth at gcc dot gnu.org @ 2020-09-30 9:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97236
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #4)
> So what goes wrong is the single-element interleaving code-gen for the
> pointer copy. We have
>
> t.c:18:21: note: Detected single element interleaving
> picture_7(D)->p[i_18].p_pixels step 16
>
> but for the store:
>
> t.c:18:21: missed: not consecutive access res_8(D)->p[i_18].p_pixels = _1;
> t.c:18:21: note: using strided accesses
>
> ...
>
> t.c:18:21: note: ==> examining statement: _1 =
> picture_7(D)->p[i_18].p_pixels;
> t.c:18:21: note: vect_model_load_cost: aligned.
> t.c:18:21: note: vect_model_load_cost: inside_cost = 24, prologue_cost = 0
> .
>
> and in group get-load-store type we handle it as (V1DI)
>
> if (!STMT_VINFO_STRIDED_P (first_stmt_info)
> && (can_overrun_p || !would_overrun_p)
> && compare_step_with_zero (vinfo, stmt_info) > 0)
> {
> /* First cope with the degenerate case of a single-element
> vector. */
> if (known_eq (TYPE_VECTOR_SUBPARTS (vectype), 1U))
> *memory_access_type = VMAT_CONTIGUOUS;
So both doing && gap == 0 here and removing this special-case alltogether
passes bootstrap / regtest on x86_64.
I have no idea why the special case was needed in the first place?
Was the load-lanes code confused? I think VMAT_ELEMENTWISE for
single-element vectors is a good enough match? What's the advantage
of VMAT_CONTIGUOUS here?
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--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:04b99da898a9817e72fedb4063589648b7961ac5
commit r11-3594-g04b99da898a9817e72fedb4063589648b7961ac5
Author: Richard Biener <rguenther@suse.de>
Date: Thu Oct 1 15:12:35 2020 +0200
tree-optimization/97236 - fix bad use of VMAT_CONTIGUOUS
This avoids using VMAT_CONTIGUOUS with single-element interleaving
when using V1mode vectors. Instead keep VMAT_ELEMENTWISE but
continue to avoid load-lanes and gathers.
2020-10-01 Richard Biener <rguenther@suse.de>
PR tree-optimization/97236
* tree-vect-stmts.c (get_group_load_store_type): Keep
VMAT_ELEMENTWISE for single-element vectors.
* gcc.dg/vect/pr97236.c: New testcase.
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From: rguenth at gcc dot gnu.org @ 2020-10-01 13:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97236
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |10.1.0, 11.0
Summary|[10/11 Regression] |[10 Regression]
|g:e93428a8b056aed83a7678 |g:e93428a8b056aed83a7678
|triggers vlc miscompile |triggers vlc miscompile
Known to fail| |10.2.0
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
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To: gcc-bugs
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--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Matthias Klose
<doko@gcc.gnu.org>:
https://gcc.gnu.org/g:1ab88985631dd2c5a5e3b5c0dce47cf8b6ed2f82
commit r10-8859-g1ab88985631dd2c5a5e3b5c0dce47cf8b6ed2f82
Author: Matthias Klose <doko@ubuntu.com>
Date: Tue Oct 6 13:41:37 2020 +0200
Backport fix for PR/tree-optimization/97236 - fix bad use of
VMAT_CONTIGUOUS
This avoids using VMAT_CONTIGUOUS with single-element interleaving
when using V1mode vectors. Instead keep VMAT_ELEMENTWISE but
continue to avoid load-lanes and gathers.
2020-10-01 Richard Biener <rguenther@suse.de>
PR tree-optimization/97236
* tree-vect-stmts.c (get_group_load_store_type): Keep
VMAT_ELEMENTWISE for single-element vectors.
* gcc.dg/vect/pr97236.c: New testcase.
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To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97236
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kristian.klausen at scoutdi dot co
| |m
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 98932 has been marked as a duplicate of this bug. ***
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From: rguenth at gcc dot gnu.org @ 2021-02-03 8:26 UTC (permalink / raw)
To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|10.3 |8.5
Resolution|FIXED |---
Summary|[10 Regression] |[8/9 Regression]
|g:e93428a8b056aed83a7678 |g:e93428a8b056aed83a7678
|triggers vlc miscompile |triggers vlc miscompile
Status|RESOLVED |REOPENED
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Reopen for more backports.
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--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Kyrylo Tkachov
<ktkachov@gcc.gnu.org>:
https://gcc.gnu.org/g:97b668f9a8c6ec565c278a60e7d1492a6932e409
commit r9-9224-g97b668f9a8c6ec565c278a60e7d1492a6932e409
Author: Matthias Klose <doko@ubuntu.com>
Date: Tue Oct 6 13:41:37 2020 +0200
Backport fix for PR/tree-optimization/97236 - fix bad use of
VMAT_CONTIGUOUS
This avoids using VMAT_CONTIGUOUS with single-element interleaving
when using V1mode vectors. Instead keep VMAT_ELEMENTWISE but
continue to avoid load-lanes and gathers.
2020-10-01 Richard Biener <rguenther@suse.de>
PR tree-optimization/97236
* tree-vect-stmts.c (get_group_load_store_type): Keep
VMAT_ELEMENTWISE for single-element vectors.
* gcc.dg/vect/pr97236.c: New testcase.
(cherry picked from commit 1ab88985631dd2c5a5e3b5c0dce47cf8b6ed2f82)
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To: gcc-bugs
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--- Comment #13 from ktkachov at gcc dot gnu.org ---
*** Bug 98949 has been marked as a duplicate of this bug. ***
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From: ktkachov at gcc dot gnu.org @ 2021-02-05 15:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97236
ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |9.3.1
CC| |ktkachov at gcc dot gnu.org
Summary|[8/9 Regression] |[8 Regression]
|g:e93428a8b056aed83a7678 |g:e93428a8b056aed83a7678
|triggers vlc miscompile |triggers vlc miscompile
--- Comment #14 from ktkachov at gcc dot gnu.org ---
Fixed for GCC 9.4
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2020-09-29 7:12 [Bug tree-optimization/97236] New: [10/11 Regression] g:e93428a8b056aed83a7678 triggers vlc miscompile rguenth at gcc dot gnu.org
` (15 preceding siblings ...)
2021-02-05 15:45 ` [Bug tree-optimization/97236] [8 " ktkachov at gcc dot gnu.org
@ 2021-02-08 10:33 ` cvs-commit at gcc dot gnu.org
2021-02-08 10:43 ` rguenth at gcc dot gnu.org
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From: cvs-commit at gcc dot gnu.org @ 2021-02-08 10:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97236
--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-8 branch has been updated by Kyrylo Tkachov
<ktkachov@gcc.gnu.org>:
https://gcc.gnu.org/g:de0ede7625f6c4d4bbd2caaf363032b0da80cf69
commit r8-10757-gde0ede7625f6c4d4bbd2caaf363032b0da80cf69
Author: Matthias Klose <doko@ubuntu.com>
Date: Tue Oct 6 13:41:37 2020 +0200
Backport fix for PR/tree-optimization/97236 - fix bad use of
VMAT_CONTIGUOUS
This avoids using VMAT_CONTIGUOUS with single-element interleaving
when using V1mode vectors. Instead keep VMAT_ELEMENTWISE but
continue to avoid load-lanes and gathers.
2020-10-01 Richard Biener <rguenther@suse.de>
PR tree-optimization/97236
* tree-vect-stmts.c (get_group_load_store_type): Keep
VMAT_ELEMENTWISE for single-element vectors.
* gcc.dg/vect/pr97236.c: New testcase.
(cherry picked from commit 1ab88985631dd2c5a5e3b5c0dce47cf8b6ed2f82)
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2020-09-29 7:12 [Bug tree-optimization/97236] New: [10/11 Regression] g:e93428a8b056aed83a7678 triggers vlc miscompile rguenth at gcc dot gnu.org
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2021-02-08 10:33 ` cvs-commit at gcc dot gnu.org
@ 2021-02-08 10:43 ` rguenth at gcc dot gnu.org
2021-03-04 8:06 ` marxin at gcc dot gnu.org
2021-04-19 6:31 ` rguenth at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2021-02-08 10:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97236
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|REOPENED |RESOLVED
--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 21+ messages in thread* [Bug tree-optimization/97236] [8 Regression] g:e93428a8b056aed83a7678 triggers vlc miscompile
2020-09-29 7:12 [Bug tree-optimization/97236] New: [10/11 Regression] g:e93428a8b056aed83a7678 triggers vlc miscompile rguenth at gcc dot gnu.org
` (17 preceding siblings ...)
2021-02-08 10:43 ` rguenth at gcc dot gnu.org
@ 2021-03-04 8:06 ` marxin at gcc dot gnu.org
2021-04-19 6:31 ` rguenth at gcc dot gnu.org
19 siblings, 0 replies; 21+ messages in thread
From: marxin at gcc dot gnu.org @ 2021-03-04 8:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97236
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |Arfrever.FTA at GMail dot Com
--- Comment #17 from Martin Liška <marxin at gcc dot gnu.org> ---
*** Bug 99375 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 21+ messages in thread* [Bug tree-optimization/97236] [8 Regression] g:e93428a8b056aed83a7678 triggers vlc miscompile
2020-09-29 7:12 [Bug tree-optimization/97236] New: [10/11 Regression] g:e93428a8b056aed83a7678 triggers vlc miscompile rguenth at gcc dot gnu.org
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2021-03-04 8:06 ` marxin at gcc dot gnu.org
@ 2021-04-19 6:31 ` rguenth at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2021-04-19 6:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97236
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sudi at gcc dot gnu.org
--- Comment #18 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 85804 has been marked as a duplicate of this bug. ***
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