TIF_FPUBOUND
test_ti_thread_flag(__prev_ti, TIF_FPUBOUND) && \
clear_ti_thread_flag(__prev_ti, TIF_FPUBOUND); \
#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
if (test_ti_thread_flag(ti, TIF_FPUBOUND) &&
clear_ti_thread_flag(ti, TIF_FPUBOUND);
clear_tsk_thread_flag(p, TIF_FPUBOUND);
set_thread_flag(TIF_FPUBOUND);