[llvm] [X86][SelectionDAG] - Add support for llvm.canonicalize intrinsic (PR #106370)

[Matt Arsenault via llvm-commits]

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@@ -58159,6 +58160,25 @@ static SDValue combineINTRINSIC_VOID(SDNode *N, SelectionDAG &DAG,
   return SDValue();
 }
 
+static SDValue combineCanonicalize(SDNode *N, SelectionDAG &DAG) {
+  SDValue Operand = N->getOperand(0);
+  EVT VT = Operand.getValueType();
+  SDLoc dl(N);
+
+  // Canonicalize scalar variable FP Nodes.
+  SDValue One =
+      DAG.getNode(ISD::SINT_TO_FP, dl, VT, DAG.getConstant(1, dl, MVT::i32));
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arsenm wrote:

This also is lowering, it is not combine. It should not be invoked through PerformDAGCombine 

https://github.com/llvm/llvm-project/pull/106370