https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91656
--- Comment #2 from Zdenek Sojka <zsojka at seznam dot cz> --- Created attachment 46828 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46828&action=edit testcase for x86_64-pc-linux-gnu r275271 is OK r275396 is BAD $ x86_64-pc-linux-gnu-gcc -O3 testcase.c && ./a.out Aborted $ x86_64-pc-linux-gnu-gcc -O3 testcase.c -fno-gcse-after-reload && ./a.out (finishes correctly) $ 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-275396-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/10.0.0/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 --disable-bootstrap --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-275396-checking-yes-rtl-df-extra-nobootstrap-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 10.0.0 20190905 (experimental) (GCC)