[Bug target/86334] New: wrong code with -march=athlon -mmemcpy-strategy=libcall:-1:noalign

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86334

            Bug ID: 86334
           Summary: wrong code with -march=athlon
                    -mmemcpy-strategy=libcall:-1:noalign
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: i686-pc-linux-gnu

Created attachment 44326
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44326&action=edit
reduced testcase

Output:
$ i686-pc-linux-gnu-gcc -O -march=athlon -minline-all-stringops
-minline-stringops-dynamically -mmemcpy-strategy=libcall:-1:noalign testcase.c
testcase.c: In function 'foo':
testcase.c:5:1: warning: AVX512F vector return without AVX512F enabled changes
the ABI [-Wpsabi]
 {
 ^
$ ./a.out 
Aborted

There is missing any initialization of the data -> it contains any garbage just
present on the stack.

$ i686-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-i686/bin/i686-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-262017-checking-yes-rtl-df-extra-i686/bin/../libexec/gcc/i686-pc-linux-gnu/9.0.0/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl --with-sysroot=/usr/i686-pc-linux-gnu
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=i686-pc-linux-gnu --with-ld=/usr/bin/i686-pc-linux-gnu-ld
--with-as=/usr/bin/i686-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-262017-checking-yes-rtl-df-extra-i686
Thread model: posix
gcc version 9.0.0 20180625 (experimental) (GCC)