diff --git a/mie/ctx.c b/mie/ctx.c
index 91b9e84..7204bda 100644
--- a/mie/ctx.c
+++ b/mie/ctx.c
@@ -88,7 +88,6 @@ struct mie_op *mie_ctx_create_op(
 
 	out->op_flags |= MIE_OP_F_OP_RESOLVED;
 	out->op_info = def;
-	out->op_dialect = def->op_parent;
 
 	return out;
 }
@@ -129,7 +128,6 @@ bool mie_ctx_resolve_op(const struct mie_ctx *ctx, struct mie_op *op)
 		return false;
 	}
 
-	op->op_dialect = dialect;
 	op->op_info = op_info;
 
 	free(op->op_name);
diff --git a/mie/include/mie/ir/op.h b/mie/include/mie/ir/op.h
index 52b1a11..963c757 100644
--- a/mie/include/mie/ir/op.h
+++ b/mie/include/mie/ir/op.h
@@ -76,6 +76,8 @@ MIE_API void mie_op_destroy(struct mie_op *op);
 MIE_API void mie_op_init(struct mie_op *op);
 MIE_API void mie_op_cleanup(struct mie_op *op);
 
+MIE_API size_t mie_op_get_name(const struct mie_op *op, char *out, size_t max);
+
 MIE_API struct mie_op_arg *mie_op_add_arg(struct mie_op *op);
 MIE_API struct mie_register *mie_op_add_result(
 	struct mie_op *op, const struct mie_type *ty);
diff --git a/mie/ir/builder.c b/mie/ir/builder.c
index 9dde8a7..8b4aae4 100644
--- a/mie/ir/builder.c
+++ b/mie/ir/builder.c
@@ -145,7 +145,6 @@ struct mie_op *mie_builder_put_op(
 	struct mie_op *op = mie_block_add_op(block);
 	op->op_flags = MIE_OP_F_OP_RESOLVED;
 	op->op_info = op_def;
-	op->op_dialect = op_def->op_parent;
 
 	for (size_t i = 0; i < nr_args; i++) {
 		struct mie_op_arg *arg = mie_op_add_arg(op);
diff --git a/mie/ir/op.c b/mie/ir/op.c
index 88dd13b..5fe4b6e 100644
--- a/mie/ir/op.c
+++ b/mie/ir/op.c
@@ -66,6 +66,17 @@ void mie_op_cleanup(struct mie_op *op)
 	/* TODO */
 }
 
+size_t mie_op_get_name(const struct mie_op *op, char *out, size_t max)
+{
+	if (!(op->op_flags & MIE_OP_F_OP_RESOLVED)) {
+		return snprintf(out, max, "%s", op->op_name);
+	}
+
+	return snprintf(
+		out, max, "%s.%s", op->op_info->op_parent->d_name,
+		op->op_info->op_name);
+}
+
 struct mie_op_arg *mie_op_add_arg(struct mie_op *op)
 {
 	return mie_vector_emplace_back(op->op_args, &op_arg_vector_ops);
@@ -139,11 +150,11 @@ struct mie_region *mie_op_add_region(struct mie_op *op)
 
 bool mie_op_is(const struct mie_op *op, const char *dialect_name, const char *op_name)
 {
-	if (!op->op_info || !op->op_dialect) {
+	if (!op->op_info || !op->op_info->op_parent) {
 		return false;
 	}
 
-	if (strcmp(op->op_dialect->d_name, dialect_name) != 0) {
+	if (strcmp(op->op_info->op_parent->d_name, dialect_name) != 0) {
 		return false;
 	}
 
diff --git a/mie/ir/walk.c b/mie/ir/walk.c
index 6b931ae..e128f62 100644
--- a/mie/ir/walk.c
+++ b/mie/ir/walk.c
@@ -326,7 +326,8 @@ static void print_stack(struct mie_walker *walker)
 		case MIE_WALK_ITEM_OP:
 			printf("* %zu: op %p", item->i_depth, item->i_op);
 			if (item->i_op->op_flags & MIE_OP_F_OP_RESOLVED) {
-				printf(" %s.%s", item->i_op->op_dialect->d_name,
+				printf(" %s.%s",
+				       item->i_op->op_info->op_parent->d_name,
 				       item->i_op->op_info->op_name);
 			} else {
 				printf(" %s", item->i_op->op_name);
diff --git a/mie/pass/builtin/convert-scf-to-cf.c b/mie/pass/builtin/convert-scf-to-cf.c
index 27750e9..b00075f 100644
--- a/mie/pass/builtin/convert-scf-to-cf.c
+++ b/mie/pass/builtin/convert-scf-to-cf.c
@@ -31,7 +31,7 @@ static enum mie_match_result if_match(const struct mie_op *op)
 static struct mie_rewrite_result if_rewrite(
 	struct mie_op *op, struct mie_rewriter *rewriter)
 {
-	printf("if: rewriting %p %s.%s\n", op, op->op_dialect->d_name,
+	printf("if: rewriting %p %s.%s\n", op, op->op_info->op_parent->d_name,
 	       op->op_info->op_name);
 
 	struct mie_register *cond = mie_op_get_arg(op, 0);
@@ -111,7 +111,7 @@ static struct mie_pass_result transform(
 	struct mie_pass *pass, struct mie_op *op, struct mie_pass_args *args)
 {
 	printf("%s: taking a look at %p %s.%s\n", mie_pass_get_name(pass), op,
-	       op->op_dialect->d_name, op->op_info->op_name);
+	       op->op_info->op_parent->d_name, op->op_info->op_name);
 
 	struct mie_convert_config *cfg = mie_convert_config_create(args->p_ctx);
 	mie_convert_config_add_illegal_op(cfg, "scf", "if");
diff --git a/mie/pass/pass-manager.c b/mie/pass/pass-manager.c
index 3c038a3..9e9458b 100644
--- a/mie/pass/pass-manager.c
+++ b/mie/pass/pass-manager.c
@@ -3,6 +3,7 @@
 #include <mie/dialect/dialect.h>
 #include <mie/interface/interface-definition.h>
 #include <mie/ir/block.h>
+#include <mie/ir/op-definition.h>
 #include <mie/ir/op.h>
 #include <mie/ir/region.h>
 #include <mie/ir/walk.h>
@@ -153,7 +154,7 @@ static bool filter_check_op(
 		return false;
 	}
 
-	if (filter->f_dialect && op->op_dialect != filter->f_dialect) {
+	if (filter->f_dialect && op->op_info->op_parent != filter->f_dialect) {
 		return false;
 	}
 
diff --git a/mie/print/op.c b/mie/print/op.c
index 4beb9eb..f4b19b2 100644
--- a/mie/print/op.c
+++ b/mie/print/op.c
@@ -207,7 +207,7 @@ static void print_generic_op(struct mie_printer *printer, const struct mie_op *o
 	if (op->op_flags & MIE_OP_F_OP_RESOLVED) {
 		b_stream_write_fmt(
 			printer->p_stream, NULL, "%s.%s",
-			op->op_dialect->d_name, op->op_info->op_name);
+			op->op_info->op_parent->d_name, op->op_info->op_name);
 	} else {
 		b_stream_write_string(printer->p_stream, op->op_name, NULL);
 	}
@@ -275,7 +275,7 @@ void mie_printer_print_op_name(struct mie_printer *printer, const struct mie_op
 	if (printer->p_flags & MIE_PRINT_F_GENERIC) {
 		generic = true;
 		b_stream_write_char(printer->p_stream, '~');
-	} else if (!strcmp(op->op_dialect->d_name, "builtin")) {
+	} else if (!strcmp(op->op_info->op_parent->d_name, "builtin")) {
 		builtin = true;
 	}
 
@@ -286,7 +286,8 @@ void mie_printer_print_op_name(struct mie_printer *printer, const struct mie_op
 
 	if (generic || !builtin || !abbreviate) {
 		b_stream_write_fmt(
-			printer->p_stream, NULL, "%s.", op->op_dialect->d_name);
+			printer->p_stream, NULL, "%s.",
+			op->op_info->op_parent->d_name);
 	}
 
 	b_stream_write_string(printer->p_stream, op->op_info->op_name, NULL);
diff --git a/mie/rewrite/rewriter.c b/mie/rewrite/rewriter.c
index 8030a80..b5a7730 100644
--- a/mie/rewrite/rewriter.c
+++ b/mie/rewrite/rewriter.c
@@ -382,7 +382,6 @@ struct mie_op *mie_rewriter_put_op(
 
 	op->op_flags = MIE_OP_F_OP_RESOLVED;
 	op->op_info = op_def;
-	op->op_dialect = op_def->op_parent;
 
 	for (size_t i = 0; i < nr_args; i++) {
 		struct mie_op_arg *arg = mie_op_add_arg(op);
@@ -407,7 +406,6 @@ struct mie_op *mie_rewriter_replace_op(
 	}
 
 	op->op_info = op_def;
-	op->op_dialect = op_def->op_parent;
 
 	return op;
 }