https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69613
Bug ID: 69613 Summary: [6 Regression] wrong code with -O and simple 128bit arithmetics @ aarch64 Product: gcc Version: 6.0 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: aarch64-unknown-linux-gnu Created attachment 37548 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37548&action=edit reduced testcase Output: $ aarch64-unknown-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=/repo/gcc-trunk/binary-latest-aarch64/bin/aarch64-unknown-linux-gnu-gcc COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-233030-checking-yes-rtl-df-nographite-aarch64/bin/../libexec/gcc/aarch64-unknown-linux-gnu/6.0.0/lto-wrapper Target: aarch64-unknown-linux-gnu Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++ --enable-checking=yes,rtl,df --without-cloog --without-ppl --without-isl --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --target=aarch64-unknown-linux-gnu --with-ld=/usr/bin/aarch64-unknown-linux-gnu-ld --with-as=/usr/bin/aarch64-unknown-linux-gnu-as --with-sysroot=/usr/aarch64-unknown-linux-gnu --disable-libstdcxx-pch --prefix=/repo/gcc-trunk//binary-trunk-233030-checking-yes-rtl-df-nographite-aarch64 Thread model: posix gcc version 6.0.0 20160201 (experimental) (GCC) $ aarch64-unknown-linux-gnu-gcc -O testcase.c $ ./a.out ffffffffffffffff8000000000000006 qemu: uncaught target signal 6 (Aborted) - core dumped Aborted Tested revisions: r233030 - FAIL 5-branch r233025 - OK 4_9-branch r233024 - OK 4_8-branch r224828 - OK