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How to perform 6 byte addition with efficiency using C code

Vindhyeshwari Kashyap 

unsigned long ul1=XX, ul2=YY, ul;
unsigned int ui1=AA, ui2=BB, ui;

ui=ui1+ui2;
ul=ul1+(ul2+(unsigned long)CY);

very inefficient code is generated by C51.
but this can be done using ADC (add with carry) if assembly is used.

Is there any way in C itself, to perform 6 byte addition?

0