[flang-commits] [flang] [flang] add fir.box_offset operation (PR #73641)

[Tom Eccles via flang-commits]

================
@@ -3036,4 +3036,43 @@ def fir_DeclareOp : fir_Op<"declare", [AttrSizedOperandSegments,
   let hasVerifier = 1;
 }
 
+def fir_BoxOffsetOp : fir_Op<"box_offset", [NoMemoryEffect]> {
+
+  let summary = "Get the address of a field in a fir.ref<fir.box>";
+
+  let description = [{
+    Given the address of a fir.box, compute the address of a field inside
+    the fir.box.
+    This allows keeping the actual runtime descriptor layout abstract in
+    FIR while providing access to the pointer addresses in the runtime
+    descriptor for OpenMP/OpenACC target mapping.
+
+    To avoid requiring too much about the fields that the runtime descriptor
----------------
tblah wrote:

```suggestion
    To avoid requiring too much information about the fields that the runtime descriptor
```

https://github.com/llvm/llvm-project/pull/73641