[Bug target/78585] New: unaligned vmovaps memory operand generated for i686 target

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78585

            Bug ID: 78585
           Summary: unaligned vmovaps memory operand generated for i686
                    target
           Product: gcc
           Version: 7.0
            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
             Build: x86_64-pc-linux-gnu

Created attachment 40189
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40189&action=edit
reduced testcase

Output:
$ i686-pc-linux-gnu-gcc -Os -fno-ipa-cp -fschedule-insns -mavx testcase.c
$ ./a.out 
Segmentation fault

Stack was correctly aligned when entering foo(). When addressing m128 relative
to ebp, offset%16==8 must hold. But here, offset==68:
...
        vmovaps XMMWORD PTR [ebp-68], xmm0
...
        vpaddq  xmm2, xmm2, XMMWORD PTR [ebp-68]
...


$ 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-242953-checking-yes-rtl-df-extra-nobootstrap-nographite-i686/bin/../libexec/gcc/i686-pc-linux-gnu/7.0.0/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
--disable-bootstrap --without-cloog --without-ppl --without-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-242953-checking-yes-rtl-df-extra-nobootstrap-nographite-i686
Thread model: posix
gcc version 7.0.0 20161129 (experimental) (GCC)