[Bug other/101520] New: [12 regression] gcc.target/powerpc/pr93658.c has excess errors after r12-2338

[Bug other/101520] New: [12 regression] gcc.target/powerpc/pr93658.c has excess errors after r12-2338

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101520

            Bug ID: 101520
           Summary: [12 regression] gcc.target/powerpc/pr93658.c has
                    excess errors after r12-2338
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

g:f0500db3692276f60e0562c17c87a0cb03e34398, r12-2338
make  -k check-gcc RUNTESTFLAGS="powerpc.exp=gcc.target/powerpc/pr93658.c"
FAIL: gcc.target/powerpc/pr93658.c (test for excess errors)
# of unexpected failures        1


I am not sure if these are real issues in the test case or not.


Executing on host: /home/seurer/gcc/git/build/gcc-test/gcc/xgcc
-B/home/seurer/gcc/git/build/gcc-test/gcc/ exceptions_enabled4114679.cc   
-fdiagnostics-plain-output  -S -o exceptions_enabled4114679.s    (timeout = 5)
spawn -ignore SIGHUP /home/seurer/gcc/git/build/gcc-test/gcc/xgcc
-B/home/seurer/gcc/git/build/gcc-test/gcc/ exceptions_enabled4114679.cc
-fdiagnostics-plain-output -S -o exceptions_enabled4114679.s
FAIL: gcc.target/powerpc/pr93658.c (test for excess errors)
Excess errors:
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 1 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/git/gcc-test/gcc/testsuite/gcc.target/powerpc/pr93658.c:18:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]



commit f0500db3692276f60e0562c17c87a0cb03e34398 (HEAD, refs/bisect/bad)
Author: Martin Sebor <msebor@redhat.com>
Date:   Thu Jul 15 13:15:03 2021 -0600

    Detect buffer overflow by aggregate and vector stores [PR97027].

[Bug testsuite/101520] [12 regression] gcc.target/powerpc/pr93658.c has excess errors after r12-2338

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101520

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-07-19
          Component|other                       |testsuite
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The test uses a loop to write into consecutive bytes of a char variable.  The
loop vectorizer turns it into a series of assignments of vector(16) char each,
which the warning then points out.  A simple fix for the test is
straightforward: suppress the warning.

A better solution to this class of problems is to constrain the loop unroller
and/or vectorizer to prevent emitting more stores than fit in the destination.

[Bug testsuite/101520] [12 regression] gcc.target/powerpc/pr93658.c has excess errors after r12-2338

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101520

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
           Assignee|unassigned at gcc dot gnu.org      |msebor at gcc dot gnu.org

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
I have suppressed the warnings in r12-2401.

[Bug testsuite/101520] [12 regression] gcc.target/powerpc/pr93658.c has excess errors after r12-2338

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101520

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |12.0
           Keywords|                            |testsuite-fail