[PATCH] SelectionDAG: Don't do libcall on div/rem if divrem is custom

[Ahmed Bougacha]

I'm not a big fan, but I don't have a better alternative, so, LGTM, thanks!

In http://reviews.llvm.org/D7803#177402, @jvesely wrote:

> i considered using SDNode, but the line
>  SDNode *Res = DAG.getNode(..................).getNode();
>  looked a bit long/awkward.


Fair enough.  How about using an explicit Res.getValue(0) for DIV instead?


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