diff --git a/mie/include/mie/ir/block.h b/mie/include/mie/ir/block.h
index 4769ece..ec8630f 100644
--- a/mie/include/mie/ir/block.h
+++ b/mie/include/mie/ir/block.h
@@ -20,5 +20,6 @@ struct mie_block {
 extern struct mie_vector_ops mie_block_vector_ops;
 
 MIE_API struct mie_op *mie_block_add_op(struct mie_block *block);
+MIE_API struct mie_register *mie_block_add_param(struct mie_block *block);
 
 #endif
diff --git a/mie/ir/block.c b/mie/ir/block.c
new file mode 100644
index 0000000..2802665
--- /dev/null
+++ b/mie/ir/block.c
@@ -0,0 +1,19 @@
+#include <mie/ir/block.h>
+#include <mie/ir/op.h>
+#include <mie/ir/register.h>
+
+struct mie_op *mie_block_add_op(struct mie_block *block)
+{
+	return mie_vector_emplace_back(block->b_ops, NULL);
+}
+
+struct mie_register *mie_block_add_param(struct mie_block *block)
+{
+	struct mie_register *result = mie_vector_emplace_back(
+		block->b_params, &mie_register_vector_ops);
+	result->reg_flags = MIE_REGISTER_F_VIRTUAL | MIE_REGISTER_F_BLOCK_PARAM;
+	result->reg_block = block;
+	result->reg_op = NULL;
+
+	return result;
+}