https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81616
--- Comment #20 from Andrew Roberts <andrewm.roberts at sky dot com> --- Again those latest mt19937ar results above were with the current snapshot: /usr/local/gcc/bin/gcc -v Using built-in specs. COLLECT_GCC=/usr/local/gcc/bin/gcc COLLECT_LTO_WRAPPER=/usr/local/gcc-8.0.0/libexec/gcc/x86_64-unknown-linux-gnu/8.0.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ../gcc-8.0.0/configure --prefix=/usr/local/gcc-8.0.0 --program-suffix= --disable-werror --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --enable-gnu-indirect-function --with-isl --enable-languages=c,c++,fortran,lto --disable-libgcj --enable-lto --enable-multilib --with-tune=generic --with-arch_32=i686 --host=x86_64-unknown-linux-gnu --build=x86_64-unknown-linux-gnu --disable-bootstrap Thread model: posix gcc version 8.0.0 20171126 (experimental) (GCC)