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* [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
@ 2024-04-16 6:53 prathamesh3492 at gcc dot gnu.org
2024-04-16 7:06 ` [Bug tree-optimization/114736] " prathamesh3492 at gcc dot gnu.org
` (12 more replies)
0 siblings, 13 replies; 14+ messages in thread
From: prathamesh3492 at gcc dot gnu.org @ 2024-04-16 6:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
Bug ID: 114736
Summary: ICE during SLP pass with gfortran-13 -O3
-mcpu=neoverse-v2
Product: gcc
Version: 13.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: prathamesh3492 at gcc dot gnu.org
Target Milestone: ---
Hi,
For the following test-case:
SUBROUTINE MY_ROUTINE (N, A, B )
IMPLICIT NONE
INTEGER, INTENT(IN) :: N
COMPLEX, INTENT(IN) :: A(N)
COMPLEX, INTENT(OUT) :: B(N)
INTEGER :: II
B(:) = (1.,0.)
DO II = 1, N-1
B(II) = A(N-II+1) / A(N-II)
ENDDO
END SUBROUTINE MY_ROUTINE
Compiling with gfortran-13 -O3 -mcpu=neoverse-v2 results in following ICE:
during GIMPLE pass: slp
dump file: t5.f90.180t.slp1
t5.f90:1:21:
1 | SUBROUTINE MY_ROUTINE (N, A, B )
| ^
internal compiler error: in create_partitions, at tree-vect-slp.cc:4226
0x12a4aef vect_optimize_slp_pass::create_partitions()
../../gcc/gcc/tree-vect-slp.cc:4226
0x12a617b vect_optimize_slp_pass::run()
../../gcc/gcc/tree-vect-slp.cc:5642
0x12a626b vect_optimize_slp(vec_info*)
../../gcc/gcc/tree-vect-slp.cc:5666
0x12abdef vect_optimize_slp(vec_info*)
../../gcc/gcc/tree-vect-slp.cc:7486
0x12abdef vect_slp_analyze_bb_1
../../gcc/gcc/tree-vect-slp.cc:7450
0x12abdef vect_slp_region
../../gcc/gcc/tree-vect-slp.cc:7538
0x12adc0b vect_slp_bbs
../../gcc/gcc/tree-vect-slp.cc:7746
0x12adf57 vect_slp_function(function*)
../../gcc/gcc/tree-vect-slp.cc:7847
0x12b949f execute
../../gcc/gcc/tree-vectorizer.cc:1529
Thanks,
Prathamesh
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
@ 2024-04-16 7:06 ` prathamesh3492 at gcc dot gnu.org
2024-04-16 7:08 ` prathamesh3492 at gcc dot gnu.org
` (11 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: prathamesh3492 at gcc dot gnu.org @ 2024-04-16 7:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
--- Comment #1 from prathamesh3492 at gcc dot gnu.org ---
Investigating this a bit further, the ICE appears with gfortran-13 because for
the testcase, because length of postorder traversal over SLP graph (27) doesn't
match number of nodes (28), and thus we hit the following assert in
create_partitions:
/* Calculate a postorder of the graph, ignoring edges that correspond
to natural latch edges in the cfg. Reading the vector from the end
to the beginning gives the reverse postorder. */
auto_vec<int> initial_rpo;
graphds_dfs (m_slpg, &m_leafs[0], m_leafs.length (), &initial_rpo,
false, NULL, skip_cfg_latch_edges);
gcc_assert (initial_rpo.length () == m_vertices.length ());
Postorder traversal of graph (initial_rpo) shows:
vertices: [ 0 1 2 3 4 5 6 7 8 9 22 23 24 10 11 12 13 14 15 16 17
18 19 20 21 25 27 ]
Vertex 26 seems to be missing, which corresponds to bb15, and thus
initial_rpo.length() is one less than m_vertices.length().
(If we don't ignore cfg latch edges during dfs walk, then it seems to "work",
but that's not right approach I guess...)
The issue doesn't reproduce with master, running git bisect showed it went away
after:
http://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=43da77a4f1636280c4259402c9c2c543e6ec6c0b
With 43da77a4, vect_slp_function splits the region at offending bb15, because
it is loop header, and it's containing loop gets marked as dont_vectorize by
ifcvt.
slp dump shows:
t5.f90:1:21: missed: splitting region at dont-vectorize loop 3 entry at bb15
So, bb15 doesn't get passed to vect_slp_bbs and eventually to
create_partitions,
avoiding the assert. So I am wondering if the issue has gone latent on trunk
rather than fixed since presence or absence of loop->dont_vectorize shouldn't
affect correctness of BB vectorizer ?
Perhaps not relevant, but this issue seems to surface only with -O3 -
mcpu=neoverse-v2. It doesn't surface with -O3, or -O3 -mcpu=generic+sve2 or
even trying out equivalent -march options corresponding to neoverse-v2:
-march=armv9-a+rng+crc+i8mm+bf16+sve2-bitperm+memtag+profile.
Thanks,
Prathamesh
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
2024-04-16 7:06 ` [Bug tree-optimization/114736] " prathamesh3492 at gcc dot gnu.org
@ 2024-04-16 7:08 ` prathamesh3492 at gcc dot gnu.org
2024-04-16 7:11 ` pinskia at gcc dot gnu.org
` (10 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: prathamesh3492 at gcc dot gnu.org @ 2024-04-16 7:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
--- Comment #2 from prathamesh3492 at gcc dot gnu.org ---
Created attachment 57956
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57956&action=edit
Input to SLP pass (dse4 dump)
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
2024-04-16 7:06 ` [Bug tree-optimization/114736] " prathamesh3492 at gcc dot gnu.org
2024-04-16 7:08 ` prathamesh3492 at gcc dot gnu.org
@ 2024-04-16 7:11 ` pinskia at gcc dot gnu.org
2024-04-16 7:12 ` pinskia at gcc dot gnu.org
` (9 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-16 7:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Does -fno-cost-model affect the behavior here?
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
` (2 preceding siblings ...)
2024-04-16 7:11 ` pinskia at gcc dot gnu.org
@ 2024-04-16 7:12 ` pinskia at gcc dot gnu.org
2024-04-16 7:21 ` prathamesh3492 at gcc dot gnu.org
` (8 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-16 7:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #3)
> Does -fno-cost-model affect the behavior here?
Sorry -fno-vect-cost-model.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
` (3 preceding siblings ...)
2024-04-16 7:12 ` pinskia at gcc dot gnu.org
@ 2024-04-16 7:21 ` prathamesh3492 at gcc dot gnu.org
2024-04-16 7:41 ` prathamesh3492 at gcc dot gnu.org
` (7 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: prathamesh3492 at gcc dot gnu.org @ 2024-04-16 7:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
--- Comment #5 from prathamesh3492 at gcc dot gnu.org ---
(In reply to Andrew Pinski from comment #3)
> Does -fno-cost-model affect the behavior here?
With 43da77a4, it doesn't result in ICE with -fno-vect-cost-model or
-fvect-cost-model=unlimited.
Prior to 43da77a4, it still results in ICE with -fno-vect-cost-model. It only
seems to pass with -fvect-cost-model=very-cheap.
Thanks,
Prathamesh
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
` (4 preceding siblings ...)
2024-04-16 7:21 ` prathamesh3492 at gcc dot gnu.org
@ 2024-04-16 7:41 ` prathamesh3492 at gcc dot gnu.org
2024-04-16 7:58 ` rguenth at gcc dot gnu.org
` (6 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: prathamesh3492 at gcc dot gnu.org @ 2024-04-16 7:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
--- Comment #6 from prathamesh3492 at gcc dot gnu.org ---
Created attachment 57957
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57957&action=edit
SLP dump
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
` (5 preceding siblings ...)
2024-04-16 7:41 ` prathamesh3492 at gcc dot gnu.org
@ 2024-04-16 7:58 ` rguenth at gcc dot gnu.org
2024-04-16 9:31 ` rguenth at gcc dot gnu.org
` (5 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: rguenth at gcc dot gnu.org @ 2024-04-16 7:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's probably latent on trunk. The assert verifies all vertices are backward
reachable from the leafs. vertices and leafs are discovered with a DFS
from the instances.
So the question is what's that missing vertex and why is it not backward
reachable.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
` (6 preceding siblings ...)
2024-04-16 7:58 ` rguenth at gcc dot gnu.org
@ 2024-04-16 9:31 ` rguenth at gcc dot gnu.org
2024-04-16 10:37 ` cvs-commit at gcc dot gnu.org
` (4 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: rguenth at gcc dot gnu.org @ 2024-04-16 9:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Last reconfirmed| |2024-04-16
Ever confirmed|0 |1
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. The missing node is
t.f90:1:21: note: node 0x39e3a80 (max_nunits=1, refcnt=2) vector(2)
real(kind=4)
t.f90:1:21: note: op: VEC_PERM_EXPR
t.f90:1:21: note: { }
t.f90:1:21: note: lane permutation { 0[1] 0[0] }
t.f90:1:21: note: children 0x39e37b0
23 (4) <- 22
-> 26 24
26 (-1) <- 23
-> 17
17 (6) <- 26 16
-> 19 18
and the edge making it backward reachable is marked as latch. Specifically
those vertices we mark as leaf forcefully in build_vertices do not match
those made unreachable by build_graph via ignoring latch edges.
t.f90:1:21: note: node 0x39e37b0 (max_nunits=2, refcnt=2) vector(2)
real(kind=4)
t.f90:1:21: note: op template: a__I_IM_lsm0.22_6 = PHI <_12(20), _73(19)>
t.f90:1:21: note: stmt 0 a__I_IM_lsm0.22_6 = PHI <_12(20), _73(19)>
t.f90:1:21: note: stmt 1 a__I_RE_lsm0.23_18 = PHI <_11(20), _74(19)>
t.f90:1:21: note: children 0x39e3840 0x39e38d0
and the issue is that the representative of the VEC_PERM node is
a__I_IM_lsm0.22_6 = PHI <_12(20), _73(19)> (a NULL one is avoided for crashes).
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
` (7 preceding siblings ...)
2024-04-16 9:31 ` rguenth at gcc dot gnu.org
@ 2024-04-16 10:37 ` cvs-commit at gcc dot gnu.org
2024-04-16 10:38 ` [Bug tree-optimization/114736] [13 Regression] " rguenth at gcc dot gnu.org
` (3 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2024-04-16 10:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
--- Comment #9 from GCC 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:f949481a1f7ab973608a4ffcc0e342ab5a74e8e4
commit r14-9993-gf949481a1f7ab973608a4ffcc0e342ab5a74e8e4
Author: Richard Biener <rguenther@suse.de>
Date: Tue Apr 16 11:33:48 2024 +0200
tree-optimization/114736 - SLP DFS walk issue
The following fixes a DFS walk issue when identifying to be ignored
latch edges. We have (bogus) SLP_TREE_REPRESENTATIVEs for VEC_PERM
nodes so those have to be explicitly ignored as possibly being PHIs.
PR tree-optimization/114736
* tree-vect-slp.cc (vect_optimize_slp_pass::is_cfg_latch_edge):
Do not consider VEC_PERM_EXPRs as PHI use.
* gfortran.dg/vect/pr114736.f90: New testcase.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] [13 Regression] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
` (8 preceding siblings ...)
2024-04-16 10:37 ` cvs-commit at gcc dot gnu.org
@ 2024-04-16 10:38 ` rguenth at gcc dot gnu.org
2024-04-16 13:09 ` prathamesh3492 at gcc dot gnu.org
` (2 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: rguenth at gcc dot gnu.org @ 2024-04-16 10:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |13.3
Known to work| |14.0
Known to fail| |13.2.1
Summary|ICE during SLP pass with |[13 Regression] ICE during
|gfortran-13 -O3 |SLP pass with gfortran-13
|-mcpu=neoverse-v2 |-O3 -mcpu=neoverse-v2
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Not sure if older releases are also affected.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] [13 Regression] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
` (9 preceding siblings ...)
2024-04-16 10:38 ` [Bug tree-optimization/114736] [13 Regression] " rguenth at gcc dot gnu.org
@ 2024-04-16 13:09 ` prathamesh3492 at gcc dot gnu.org
2024-05-03 13:55 ` cvs-commit at gcc dot gnu.org
2024-05-03 13:56 ` rguenth at gcc dot gnu.org
12 siblings, 0 replies; 14+ messages in thread
From: prathamesh3492 at gcc dot gnu.org @ 2024-04-16 13:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
--- Comment #11 from prathamesh3492 at gcc dot gnu.org ---
Hi Richard,
Thanks for the quick fix! I verified it now compiles the test-case with -O3
-mcpu=neoverse-v2. I suppose this will need backporting to gcc-13 branch. The
test compiles OK with gfortran-12.
Thanks,
Prathamesh
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] [13 Regression] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
` (10 preceding siblings ...)
2024-04-16 13:09 ` prathamesh3492 at gcc dot gnu.org
@ 2024-05-03 13:55 ` cvs-commit at gcc dot gnu.org
2024-05-03 13:56 ` rguenth at gcc dot gnu.org
12 siblings, 0 replies; 14+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2024-05-03 13:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:0624852a3ea684f6b9dabea864bcb45e31304728
commit r13-8683-g0624852a3ea684f6b9dabea864bcb45e31304728
Author: Richard Biener <rguenther@suse.de>
Date: Tue Apr 16 11:33:48 2024 +0200
tree-optimization/114736 - SLP DFS walk issue
The following fixes a DFS walk issue when identifying to be ignored
latch edges. We have (bogus) SLP_TREE_REPRESENTATIVEs for VEC_PERM
nodes so those have to be explicitly ignored as possibly being PHIs.
PR tree-optimization/114736
* tree-vect-slp.cc (vect_optimize_slp_pass::is_cfg_latch_edge):
Do not consider VEC_PERM_EXPRs as PHI use.
* gfortran.dg/vect/pr114736.f90: New testcase.
(cherry picked from commit f949481a1f7ab973608a4ffcc0e342ab5a74e8e4)
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug tree-optimization/114736] [13 Regression] ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2
2024-04-16 6:53 [Bug tree-optimization/114736] New: ICE during SLP pass with gfortran-13 -O3 -mcpu=neoverse-v2 prathamesh3492 at gcc dot gnu.org
` (11 preceding siblings ...)
2024-05-03 13:55 ` cvs-commit at gcc dot gnu.org
@ 2024-05-03 13:56 ` rguenth at gcc dot gnu.org
12 siblings, 0 replies; 14+ messages in thread
From: rguenth at gcc dot gnu.org @ 2024-05-03 13:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail|13.2.1 |13.2.0
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Known to work| |13.2.1
Priority|P3 |P2
--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed then.
^ permalink raw reply [flat|nested] 14+ messages in thread
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