[Mlir-commits] [mlir] [MLIR][LLVM] Support dso_local_equivalent constants (PR #132131)

[Christian Ulmann]

================
@@ -1575,6 +1575,44 @@ def LLVM_AliasOp : LLVM_Op<"mlir.alias",
   let hasRegionVerifier = 1;
 }
 
+def LLVM_DSOLocalEquivalentOp : LLVM_Op<"dso_local_equivalent",
+    [Pure, ConstantLike, DeclareOpInterfaceMethods<SymbolUserOpInterface>]> {
+  let arguments = (ins FlatSymbolRefAttr:$function_name);
+  let results = (outs LLVM_AnyPointer:$res);
+
+  let summary = "Creates a LLVM dso_local_equivalent ptr";
+
+  let description = [{
+    Creates an SSA value containing a pointer to a global value (function or
+    alias to function). It represents a function which is functionally
+    equivalent to a given function, but is always defined in the current
+    linkage unit. The target function may not have `extern_weak` linkage.
+
+    Examples:
+
+    ```mlir
+    llvm.mlir.global external constant @const() : i64 {
+      %0 = llvm.mlir.addressof @const : !llvm.ptr
+      %1 = llvm.ptrtoint %0 : !llvm.ptr to i64
+      %2 = llvm.dso_local_equivalent @extern_func : !llvm.ptr
----------------
Dinistro wrote:

```suggestion
      %2 = llvm.dso_local_equivalent @func : !llvm.ptr
```
Nit: `extern_func` might be a bit misleading here.

https://github.com/llvm/llvm-project/pull/132131