Hi,

The attached patch adds support for the unsigned modes (UQI, UHI, USI, 
UDI, UINT) for the cgen rtl ops ltu, leu, gtu and geu. These calls can 
be generated by code like

(if (ltu (zext UDI op1) (zext UDI op2 ))(set op3 op1 ))

ok to commit?

Dave