[llvm-dev] creating Intrinsic DAG Node

[Matt Arsenault via llvm-dev]

> On Feb 2, 2016, at 12:43, Ryan Taylor <ryta1203 at gmail.com> wrote:
> 
> Matt,
> 
>   This seems to generate llvm.my_intrinsic just fine in the DAG, so no DAG errors; however, it won't match. For example, if I call the intrinsic from C, the DAG node looks to be named the same in dotty file but it won't match... am I missing something?
> 
>   I've done it exactly the way it was done above. The DAG looks great but it won't match. Did I miss something?
> 
> Thanks.
> 

Are you using the right intrinsic type? Does it have a chain or result?

How are you calling it from C? Are you declaring the intrinsic? This can fail if you mismatched the readnone or readonly to the actual intrinsic definition