[llvm] [IR][REVEC] Define llvm.vector.broadcast intrinsic (PR #208212)

[Benjamin Maxwell via llvm-commits]

=?utf-8?q?Gaëtan?= Bossu <gaetan.bossu at arm.com>,
=?utf-8?q?Gaëtan?= Bossu <gaetan.bossu at arm.com>,
=?utf-8?q?Gaëtan?= Bossu <gaetan.bossu at arm.com>,
=?utf-8?q?Gaëtan?= Bossu <gaetan.bossu at arm.com>,
=?utf-8?q?Gaëtan?= Bossu <gaetan.bossu at arm.com>,
=?utf-8?q?Gaëtan?= Bossu <gaetan.bossu at arm.com>,
=?utf-8?q?Gaëtan?= Bossu <gaetan.bossu at arm.com>,
=?utf-8?q?Gaëtan?= Bossu <gaetan.bossu at arm.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/208212 at github.com>


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@@ -3535,6 +3538,53 @@ void DAGTypeLegalizer::SplitVecRes_FP_TO_XINT_SAT(SDNode *N, SDValue &Lo,
   Hi = DAG.getNode(N->getOpcode(), dl, DstVTHi, SrcHi, N->getOperand(1));
 }
 
+static SDValue buildSplitVectorBroadcast(SelectionDAG &DAG, SDLoc DL, EVT VT,
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MacDue wrote:

nit: Maybe make this return `std::pair<SDValue, SDValue>` (so the caller can do `auto [Lo, Hi] = ...` without the making assumptions about the result node).   

https://github.com/llvm/llvm-project/pull/208212