How to write pattern for addition with carry operation

[Mohamed Shafi]

Hello all,

The 16bit target that i am porting to gcc4.1.2 doesn't have any
instructions for 32bit operations. But for addition and subtraction
there is
addc
subc
instructions that consider carry bit also. Presently i have patterns
for SImode addition and subtraction such that the template will have

add %0, %1\naddc %N0, %N1
sub %0, %1\nsubc %N0, %N1

Will it be possible for me to write separate patterns for the
instructions add and addc?

Regards,
Shafi