A question about RTL output

[Eric Fisher]

Hello,
This is a strange problem. Why an operantion that should be a 'xorsi3'
format, yet it comes out with a 'scond' format. I have defined
'xorsi3' indeed. When I use the encluesive operantion '^', it is ok to
emit 'xorsi3'. When I compile the libgcc, it is not ok in _pack_df.o.
So what's the problem?

Thanks.
Eric.