https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66509
--- Comment #11 from Jack Howarth <howarth.at.gcc at gmail dot com> --- Also changing fildq mem; fistpq mem ro fildq (%ebp); fistpq (%ebp) allows the fildq and fistpq mnemonics to pass at -m32/-m64 on the clang-based assembler.