[llvm] [WebAssembly][GlobalISel] Implement pointer and memory ops. (PR #206885)

[Demetrius Kanios via llvm-commits]

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@@ -165,6 +199,94 @@ bool WebAssemblyInstructionSelector::select(MachineInstr &I) {
     I.setDesc(TII.get(TargetOpcode::IMPLICIT_DEF));
     return RBI.constrainGenericRegister(DefReg, *DefRC, MRI) != nullptr;
   }
+  case G_PTRTOINT: {
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QuantumSegfault wrote:

@arsenm 

I looked into this a bit more, and even if I hack  `G_PTRMASK` into match alongside `G_AND` when importing `and` DAG patterns, it won't cooperate. Likely something to do with the `SDTCisInt` constraint `SDTIntBinOp`.

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Best I've been able to do is create a `ptrmask_gi` node for compat purposes. It'll let us move the patterns to tablegen, but they still need to be duplicated. And I wouldn't know the right way to port the patterns from the other targets to tablegen anyway.

Similar situation with the other two. I can add compat nodes, and maybe port some of the simple logic to tablegen.

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How do you want to proceed?

https://github.com/llvm/llvm-project/pull/206885