[Bug tree-optimization/94524] New: wrong code with vector modulo operation

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94524

            Bug ID: 94524
           Summary: wrong code with vector modulo operation
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu

Created attachment 48232
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48232&action=edit
reduced testcase

Output:
$ x86_64-pc-linux-gnu-gcc -O testcase.c
$ ./a.out
Aborted

I am not sure sure the testcase has defined behavior, but I checked
https://gcc.gnu.org/onlinedocs/gcc/Integers-implementation.html#Integers-implementation
and https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html and I didn't find
any indication that vector operations should behave differently than scalars.
Behavior is the same with -fwrapv and neither -ftrapv or -fsanitize=undefined
don't report any problem.

$ x86_64-pc-linux-gnu-gcc -v                                            
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r10-7581-20200407082749-gbee27152f7e-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/10.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r10-7581-20200407082749-gbee27152f7e-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200407 (experimental) (GCC)