<div dir="ltr"><div>Matt,</div><div><br></div><div> Thanks for the response. Is there an example in the code somewhere of doing the intrinsic ID method? I don't need to put it a lot of places so I'm not sure it warrants adding a node.</div><div><br></div><div>Thanks.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 2, 2016 at 12:35 PM, Matt Arsenault <span dir="ltr"><<a href="mailto:arsenm2@gmail.com" target="_blank">arsenm2@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5"><br>
> On Feb 2, 2016, at 09:29, Ryan Taylor via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>> wrote:<br>
><br>
> I'm trying to 'lower' an operation that needs to create a node in the SD that is an intrinsic call.... what is the best way to do this?<br>
><br>
> I see in the DAGBuilder it calls 'setValue' which adds to the map NodeMap[V] where V is the key and the passed in SDValue is the value but I'm not sure this is a good way to do it since these are local to SelectionDAGBuilder and the lowering needs to happen in XXXISelLowering.cpp.<br>
><br>
> Thanks.<br>
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<br>
SelectionDAGBuilder creates INTRINSIC_W_CHAIN, INTRINSIC_WO_CHAIN, or INTRINSIC_VOID nodes. You want to emit those with the intrinsic ID as a TargetConstant the first operand (or second with chains). I would recommend though for these cases, if you want to emit emit them in the backend, it’s a bit nicer to lower these to a custom node, and select on that. It’s a bit nicer than having to add the intrinsic ID everywhere. Most of the AMDGPU intrinsics are handled this way.<br>
<span class="HOEnZb"><font color="#888888"><br>
-Matt</font></span></blockquote></div><br></div>