[llvm] [RISCV] Initial codegen support for the XRivosVizip extension (PR #131933)

[Min-Yih Hsu via llvm-commits]

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@@ -67,6 +67,40 @@ defm RI_VUNZIP2A_V : VALU_IV_V<"ri.vunzip2a", 0b001000>;
 defm RI_VUNZIP2B_V : VALU_IV_V<"ri.vunzip2b", 0b011000>;
 }
 
+// These are modeled after the int binop VL nodes
+def ri_vzipeven_vl : SDNode<"RISCVISD::RI_VZIPEVEN_VL", SDT_RISCVIntBinOp_VL>;
+def ri_vzipodd_vl : SDNode<"RISCVISD::RI_VZIPODD_VL", SDT_RISCVIntBinOp_VL>;
+def ri_vzip2a_vl : SDNode<"RISCVISD::RI_VZIP2A_VL", SDT_RISCVIntBinOp_VL>;
+
+multiclass RIVPseudoVALU_VV {
+  foreach m = MxList in {
+    defvar mx = m.MX;
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mshockwave wrote:

is this ever used?

https://github.com/llvm/llvm-project/pull/131933