[Bug tree-optimization/106237] New: [13 regression] serveral tests begin ICEing starting with r13-1575-gcf3a120084e946

[Bug tree-optimization/106237] New: [13 regression] serveral tests begin ICEing starting with r13-1575-gcf3a120084e946

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106237

            Bug ID: 106237
           Summary: [13 regression] serveral tests begin ICEing starting
                    with r13-1575-gcf3a120084e946
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

g:cf3a120084e94614a4917f71940325cd4b537f24, r13-1575-gcf3a120084e946

Related to, or maybe the same as, the later failure reported for power 7 BE in
PR106228 perhaps?  These fail in the same place but fail for power 8, 9, and 10
little endian and power 8 big endian.

FAIL: gcc.target/powerpc/pr56605.c (internal compiler error: in
vect_transform_loops, at tree-vectorizer.cc:1032)
FAIL: gcc.target/powerpc/pr56605.c (test for excess errors)
FAIL: gcc.target/powerpc/pr60137.c (internal compiler error: in
vect_transform_loops, at tree-vectorizer.cc:1032)
FAIL: gcc.target/powerpc/pr60137.c (test for excess errors)
FAIL: gcc.target/powerpc/vsx-vectorize-2.c (internal compiler error: in
vect_transform_loops, at tree-vectorizer.cc:1032)
FAIL: gcc.target/powerpc/vsx-vectorize-2.c (test for excess errors)
FAIL: gcc.target/powerpc/vsx-vectorize-2.c scan-tree-dump-times vect
"vectorized 1 loops" 1
FAIL: gcc.target/powerpc/vsx-vectorize-3.c (internal compiler error: in
vect_transform_loops, at tree-vectorizer.cc:1032)
FAIL: gcc.target/powerpc/vsx-vectorize-3.c (test for excess errors)
FAIL: gcc.target/powerpc/vsx-vectorize-3.c scan-tree-dump-times vect
"vectorized 1 loops" 1
FAIL: gcc.target/powerpc/vsx-vectorize-7.c (internal compiler error: in
vect_transform_loops, at tree-vectorizer.cc:1032)
FAIL: gcc.target/powerpc/vsx-vectorize-7.c (test for excess errors)
FAIL: gcc.target/powerpc/vsx-vectorize-7.c scan-tree-dump-times vect
"vectorized 1 loops" 1

spawn -ignore SIGHUP /home/seurer/gcc/git/build/gcc-test/gcc/xgcc
-B/home/seurer/gcc/git/build/gcc-test/gcc/
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr56605.c
-fdiagnostics-plain-output -O3 -mvsx -mdejagnu-cpu=power7 -fno-unroll-loops
-fdump-rtl-combine -ffat-lto-objects -S -o pr56605.s
during GIMPLE pass: vect
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr56605.c: In
function 'foo':
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr56605.c:7:6:
internal compiler error: in vect_transform_loops, at tree-vectorizer.cc:1032
0x1104fca3 vect_transform_loops
        /home/seurer/gcc/git/gcc-test/gcc/tree-vectorizer.cc:1032
0x1105016f try_vectorize_loop_1
        /home/seurer/gcc/git/gcc-test/gcc/tree-vectorizer.cc:1153
0x1105016f try_vectorize_loop
        /home/seurer/gcc/git/gcc-test/gcc/tree-vectorizer.cc:1183
0x110508f3 execute
        /home/seurer/gcc/git/gcc-test/gcc/tree-vectorizer.cc:1299


commit cf3a120084e94614a4917f71940325cd4b537f24 (HEAD, refs/bisect/bad)
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Jul 8 10:41:59 2022 +0200

    tree-optimization/106226 - move vectorizer virtual SSA update

[Bug tree-optimization/106237] [13 regression] serveral tests begin ICEing starting with r13-1575-gcf3a120084e946

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106237

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Target Milestone|---                         |13.0
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2022-07-11

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
They seem to all use -mdejagnu-cpu=power7 if I'm looking correctly.  Can you
re-check after the PR106228 fix is in?

[Bug tree-optimization/106237] [13 regression] serveral tests begin ICEing starting with r13-1575-gcf3a120084e946

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106237

--- Comment #2 from seurer at gcc dot gnu.org ---
They use whichever mcpu matches the machine.

The ICEs are fixed but there is a different problem introduced with your fix
g:79f18ac6b7ab7744fcf8937ea4bc0c40f3efc629, r13-1599-g79f18ac6b7ab77

make  -k check-gcc RUNTESTFLAGS="powerpc.exp=gcc.target/powerpc/pr56605.c"
FAIL: gcc.target/powerpc/pr56605.c scan-rtl-dump-times combine "\\(compare:CC
\\((?:and|zero_extend):(?:[SD]I) \\((?:sub)?reg:[SD]I" 1

which might just be the test case needing updating I suppose.  It occurs on the
same machines as the original problem.  It still fails with current trunk.

[Bug tree-optimization/106237] [13 regression] serveral tests begin ICEing starting with r13-1575-gcf3a120084e946

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106237

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

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

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to seurer from comment #2)
> They use whichever mcpu matches the machine.
> 
> The ICEs are fixed but there is a different problem introduced with your fix
> g:79f18ac6b7ab7744fcf8937ea4bc0c40f3efc629, r13-1599-g79f18ac6b7ab77

That just exposed what previously ICEd I think.

> make  -k check-gcc RUNTESTFLAGS="powerpc.exp=gcc.target/powerpc/pr56605.c"
> FAIL: gcc.target/powerpc/pr56605.c scan-rtl-dump-times combine
> "\\(compare:CC \\((?:and|zero_extend):(?:[SD]I) \\((?:sub)?reg:[SD]I" 1
> 
> which might just be the test case needing updating I suppose.  It occurs on
> the same machines as the original problem.  It still fails with current
> trunk.

I can see this with a cross to ppc64le as well, the pattern matches two times.
It's not clear to me what the testcase intends to test - it lacks a comment :/

c3d2600cfb476^ also exhibits this problem, so does d2a898666609^ so this
problem must exist for longer time and it seems unrelated to this issue at
hand.  Can you properly bisect and open a different bugreport for this?

[Bug tree-optimization/106237] [13 regression] serveral tests begin ICEing starting with r13-1575-gcf3a120084e946

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106237

--- Comment #4 from seurer at gcc dot gnu.org ---
gcc.target/powerpc/pr56605.c was actually reported in PR105267.