private static final void fxch(AbstractX86Stream os, FPUStack fpuStack,
static final void fxch(AbstractX86Stream os, FPUStack fpuStack,
    private static final void fxch(AbstractX86Stream os, FPUStack fpuStack,            Register fpuReg) {        if (fpuReg == Register.ST0) {            throw new StackException("Cannot fxch ST0");        }        os.writeFXCH(fpuReg);        fpuStack.fxch(fpuReg);    }