https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85255
Bug ID: 85255 Summary: [8 Regression] wrong code with -O2 -fno-tree-fre -mavx512f Product: gcc Version: 8.0.1 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: x86_64-pc-linux-gnu Created attachment 43870 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43870&action=edit reduced testcase Output: $ x86_64-pc-linux-gnu-gcc -O2 -fno-tree-fre -mavx512f testcase.c $ sde64 -- ./a.out Aborted The call to foo() is omitted; v[] == {1, 0, 0, 0, ....} instead of {0, 0, 0, ...} $ 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-259161-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.1/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 --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-259161-checking-yes-rtl-df-extra-amd64 Thread model: posix gcc version 8.0.1 20180406 (experimental) (GCC)