SR_FD
_r->sr = SR_FD; } while (0)
_r->sr = SR_FD; \
_r->sr = SR_FD; } while (0)
regs->sr |= SR_FD;
regs->sr &= ~SR_FD;
: "r" (SR_FD));
: "r" (~SR_FD));
childregs->sr |= SR_FD;
regs->sr = SR_FD;
regs->sr |= SR_FD; /* Release FPU */