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)