SW_Top            677 arch/x86/math-emu/fpu_entry.c   ((S387->swd & ~SW_Top & 0xffff) | ((S387->ftop << SW_Top_Shift) & SW_Top))
SW_Top             50 arch/x86/math-emu/status_w.h   ((partial_status & ~SW_Top & 0xffff) | ((top << SW_Top_Shift) & SW_Top))