AMD64, gcc (and the ABI) expects the x87 unit to be running in 80/64 mode (not 64/53) so that it can use it for 'long double' operations. It takes the expected precision differences into account when generating code.
AMD64, gcc (and the ABI) expects the x87 unit to be running in 80/64 mode (not 64/53) so that it can use it for 'long double' operations. It takes the expected precision differences into account when generating code.