Hi, I am studying the msp430 port and have come accross a question, I know that addhi3_cy is not a standart pattren name and I can only find it in msp430.md once which is the the pattren defination, so my question how did gcc know when to call this pattren if we did not tell gcc how and when to use it ? Thanks -- View this message in context: http://gcc.1065356.n5.nabble.com/regarding-msp430-addhi3-cy-tp1206221.html Sent from the gcc - Help mailing list archive at Nabble.com.