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

[Matt Arsenault via llvm-commits]

================
@@ -1275,6 +1275,56 @@ void SelectionDAGLegalize::LegalizeOp(SDNode *Node) {
       }
     }
     break;
+    case ISD::FCANONICALIZE: {
+      const Triple &TT = DAG.getTarget().getTargetTriple();
+      if (TT.getArch() == Triple::x86 || TT.getArch() == Triple::x86_64) {
----------------
arsenm wrote:

You do not need ExpandConstantFP at all. You do not need to consider constants, regardless of the class. Legalization must work for all inputs, which covers constants materialized in registers 

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