DOC: Comment fixups based on Marten's review

Author: seberg

numpy/core/src/multiarray/array_method.c

@@ -787,6 +787,13 @@ _masked_stridedloop_data_free(NpyAuxData *auxdata)
  * This function wraps a regular unmasked strided-loop as a
  * masked strided-loop, only calling the function for elements
  * where the mask is True.
+ *
+ * TODO: Reductions also use this code to implement masked reductions.
+ *       Before consolidating them, reductions had a special case for
+ *       broadcasts: when the mask stride was 0 the code does not check all
+ *       elements as `npy_memchr` currently does.
+ *       It may be worthwhile to add such an optimization again if broadcasted
+ *       masks are common enough.
  */
 static int
 generic_masked_strided_loop(PyArrayMethod_Context *context,

numpy/core/src/umath/dispatching.c

@@ -862,10 +862,11 @@ logical_ufunc_promoter(PyUFuncObject *NPY_UNUSED(ufunc),
                           && op_dtypes[2]->type_num != NPY_OBJECT)) {
         return 0;
     }
-    /* Actually, we have to use the OBJECT loop after all, set all we can
-     * to object (that might not work out, but just try).
+    /*
+     * Actually, we have to use the OBJECT loop after all, set all we can
+     * to object (that might not work out, but try).
      *
-     * TODO: Change this to check for `op_dtypes[0] == NULL` to STOP
+     * NOTE: Change this to check for `op_dtypes[0] == NULL` to STOP
      *       returning `object` for `np.logical_and.reduce(obj_arr)`
      *       which will also affect `np.all` and `np.any`!
      */

numpy/core/src/umath/ufunc_object.c

@@ -2849,10 +2849,6 @@ reduce_loop(PyArrayMethod_Context *context,
         strides_copy[1] = strides[1];
         strides_copy[2] = strides[0];
         if (masked) {
-            /*
-             * TODO: This code had a broadcasted-mask optimization that may
-             *       make sense in the array-method masked strided loop code.
-             */
             dataptrs_copy[3] = dataptrs[2];
             strides_copy[3] = strides[2];
         }