[llvm] [mlir] [mlir][AMDGPU] Implement AMDGPU DPP operation in MLIR. (PR #89233)

[Matt Arsenault via llvm-commits]

================
@@ -410,6 +410,61 @@ def AMDGPU_RawBufferAtomicUminOp :
   let hasVerifier = 1;
 }
 
+def AMDGPU_DPPPerm : I32EnumAttr<"DPPPerm",
+    "The possible permutations for a DPP operation",
+    [  
+      I32EnumAttrCase<"quad_perm",  0>,
+      I32EnumAttrCase<"row_shl",    1>,
+      I32EnumAttrCase<"row_shr",    2>,
+      I32EnumAttrCase<"row_ror",    3>,
+      I32EnumAttrCase<"wave_shl",   4>,
+      I32EnumAttrCase<"wave_shr",   5>,
+      I32EnumAttrCase<"wave_ror",   6>,
+      I32EnumAttrCase<"wave_rol",   7>,
+      I32EnumAttrCase<"row_mirror", 8>,
+      I32EnumAttrCase<"row_half_mirror", 9>,
+      I32EnumAttrCase<"row_bcast_15", 10>,
+      I32EnumAttrCase<"row_bcast_31", 11>
+    ]> {
+  let genSpecializedAttr = 0;  
+  let cppNamespace = "::mlir::amdgpu";
+}
+
+def AMDGPU_DPPPermAttr : EnumAttr<AMDGPU_Dialect, AMDGPU_DPPPerm,
+  "dpp_perm">;
+
+def AMDGPU_DPPOp : AMDGPU_Op<"dpp", [SameTypeOperands, AllTypesMatch<["result", "src", "old"]>]>,
+  Arguments<(ins AnyType:$src,
+                  AnyType:$old,
----------------
arsenm wrote:

This argument order looks swapped from the comment on the intrinsic 

https://github.com/llvm/llvm-project/pull/89233