FSR_VER_SHIFT
fpstate.fs_fsr = 7 << FSR_VER_SHIFT;
(fpstate.fs_fsr >> FSR_VER_SHIFT) & (FSR_VER >> FSR_VER_SHIFT);
fpstate->fs_fsr = 7 << FSR_VER_SHIFT; /* 7 is reserved for "none" */