diff --git a/src/compiler/nir/nir.c b/src/compiler/nir/nir.c
index 31f9f990dcb..26dedff4e37 100644
--- a/src/compiler/nir/nir.c
+++ b/src/compiler/nir/nir.c
@@ -1821,6 +1821,17 @@ nir_cf_node_cf_tree_next(nir_cf_node *node)
       return nir_cf_node_as_block(nir_cf_node_next(node));
 }
 
+nir_block *
+nir_cf_node_cf_tree_prev(nir_cf_node *node)
+{
+   if (node->type == nir_cf_node_block)
+      return nir_block_cf_tree_prev(nir_cf_node_as_block(node));
+   else if (node->type == nir_cf_node_function)
+      return NULL;
+   else
+      return nir_cf_node_as_block(nir_cf_node_prev(node));
+}
+
 nir_if *
 nir_block_get_following_if(nir_block *block)
 {
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 119b9efc105..a3c8127d0da 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -4551,6 +4551,10 @@ nir_block *nir_cf_node_cf_tree_last(nir_cf_node *node);
 
 nir_block *nir_cf_node_cf_tree_next(nir_cf_node *node);
 
+/* Gets the block before a CF node in source-code order */
+
+nir_block *nir_cf_node_cf_tree_prev(nir_cf_node *node);
+
 /* Macros for loops that visit blocks in source-code order */
 
 #define nir_foreach_block(block, impl)                           \