FPU_CSR_ALL_S
mask = FPU_CSR_ALL_X | FPU_CSR_ALL_E | FPU_CSR_ALL_S | FPU_CSR_RM;
mask = FPU_CSR_ALL_X | FPU_CSR_ALL_E | FPU_CSR_ALL_S | FPU_CSR_RM;
value = fcr31 & (FPU_CSR_ALL_X | FPU_CSR_ALL_S);
fcr31 &= ~(FPU_CSR_ALL_X | FPU_CSR_ALL_S);
fcr31 |= value & (FPU_CSR_ALL_X | FPU_CSR_ALL_S);