https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66509
--- Comment #9 from Jack Howarth <howarth.at.gcc at gmail dot com> --- Also, testing with in-line assembly using clang 3.7svn, I get the same behavior for... % cat conftest.c asm("filds mem; fists mem"); % clang-3.7 -c conftest.c fatal error: error in backend: 32-bit absolute addressing is not supported in 64-bit mode % clang-3.7 -m32 -c conftest.c %