[Bug tree-optimization/110614] New: [14 Regression] ICE in vect_supportable_dr_alignment

[Bug tree-optimization/110614] New: [14 Regression] ICE in vect_supportable_dr_alignment

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110614

            Bug ID: 110614
           Summary: [14 Regression] ICE in vect_supportable_dr_alignment
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dje at gcc dot gnu.org
  Target Milestone: ---
            Target: powerpc*-*-*

Beginning with

commit dd86a5a69cbda40cf76388a65d3317c91cb2b501
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Jun 22 11:40:46 2023 +0200

A number of GCC testsuite test cases ICE in vect_supportable_dr_alignment()

gcc/testsuite/gcc.dg/torture/pr68379.c

$ ./xgcc -B./ -S -O2 -mcpu=power7 pr68379.c 
during GIMPLE pass: vect
pr68379.c: In function ‘fn1’:
pr68379.c:6:1: internal compiler error: Segmentation fault
    6 | fn1 ()
      | ^~~
0x10c1d833 crash_signal
        /home/dje/src/gcc/gcc/toplev.cc:314
0x11b4ebd0 vect_supportable_dr_alignment(vec_info*, dr_vec_info*, tree_node*,
int)
        /home/dje/src/gcc/gcc/tree-vect-data-refs.cc:6833
0x11b53717 vect_enhance_data_refs_alignment(_loop_vec_info*)
        /home/dje/src/gcc/gcc/tree-vect-data-refs.cc:2044
0x10fc35bb vect_analyze_loop_2
        /home/dje/src/gcc/gcc/tree-vect-loop.cc:2783
0x10fc4d8f vect_analyze_loop_1
        /home/dje/src/gcc/gcc/tree-vect-loop.cc:3316
0x10fc56bb vect_analyze_loop(loop*, vec_info_shared*)
        /home/dje/src/gcc/gcc/tree-vect-loop.cc:3470
0x110174e7 try_vectorize_loop_1
        /home/dje/src/gcc/gcc/tree-vectorizer.cc:1064
0x110174e7 try_vectorize_loop
        /home/dje/src/gcc/gcc/tree-vectorizer.cc:1180
0x11017fa3 execute
        /home/dje/src/gcc/gcc/tree-vectorizer.cc:1296

The test cases succeed with Power8, Power9, or Power10, but ICE with
-mcpu=power7. command line option.

[Bug tree-optimization/110614] [14 Regression] ICE in vect_supportable_dr_alignment

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110614

David Edelsohn <dje at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-07-10
     Ever confirmed|0                           |1

--- Comment #1 from David Edelsohn <dje at gcc dot gnu.org> ---
Confirmed.

[Bug tree-optimization/110614] [14 Regression] ICE in vect_supportable_dr_alignment

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110614

--- Comment #2 from seurer at gcc dot gnu.org ---
This may be a dupe of PR110616 (or vice-versa).

[Bug tree-optimization/110614] [14 Regression] ICE in vect_supportable_dr_alignment

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110614

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
   Target Milestone|---                         |14.0

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look.

[Bug tree-optimization/110614] [14 Regression] ICE in vect_supportable_dr_alignment

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110614

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 110616 has been marked as a duplicate of this bug. ***

[Bug tree-optimization/110614] [14 Regression] ICE in vect_supportable_dr_alignment

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110614

--- Comment #5 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:4736ddd11874fe215662ac18877ce8eded1f5976

commit r14-2430-g4736ddd11874fe215662ac18877ce8eded1f5976
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Jul 11 10:40:19 2023 +0200

    tree-optimization/110614 - SLP splat and re-align (optimized)

    The following properly guards the re-align (optimized) paths used
    on old power CPUs for the added case of SLP splats from non-grouped
    loads.  Testcases are existing in dg-torture.

            PR tree-optimization/110614
            * tree-vect-data-refs.cc (vect_supportable_dr_alignment):
            SLP splats are not suitable for re-align ops.

[Bug tree-optimization/110614] [14 Regression] ICE in vect_supportable_dr_alignment

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110614

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Should be fixed.  Thanks for reporting.