FP_1
if (r0 < FP_1)
bit = FP_1;
fp->fp_mant[0] = FP_1 | f0; \
bit = FP_1;
nrm = FP_1;
fp->fp_mant[0] = FP_1 - 1;
if (r0 < FP_1)
bit = FP_1;
fp->fp_mant[0] = FP_1 | f0; \
bit = FP_1;
nrm = FP_1;
fp->fp_mant[0] = FP_1 - 1;