regarding msp430 addhi3_cy

[Segher Boessenkool]

On Tue, Nov 17, 2015 at 01:07:58AM -0700, htio2 wrote:
> 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 ?

The splitter immediately after those _cy pattern generates it.  The _cy
patterns do not seem to be used otherwise, they are never called directly;
they do not need a name, they could have a name starting with *.


Segher