nir: add nir_block_get_following_loop() helper

Reviewed-by: Kenneth Graunke <[email protected]>

2 files changed, 18 insertions, 0 deletions

diff --git a/src/glsl/nir/nir.c b/src/glsl/nir/nir.c
index bf001312121..acb251afe8b 100644
--- a/src/glsl/nir/nir.c
+++ b/src/glsl/nir/nir.c
@@ -1335,6 +1335,22 @@ nir_block_get_following_if(nir_block *block)
    return nir_cf_node_as_if(next_node);
 }
 
+nir_loop *
+nir_block_get_following_loop(nir_block *block)
+{
+   if (exec_node_is_tail_sentinel(&block->cf_node.node))
+      return NULL;
+
+   if (nir_cf_node_is_last(&block->cf_node))
+      return NULL;
+
+   nir_cf_node *next_node = nir_cf_node_next(&block->cf_node);
+
+   if (next_node->type != nir_cf_node_loop)
+      return NULL;
+
+   return nir_cf_node_as_loop(next_node);
+}
 static bool
 index_block(nir_block *block, void *state)
 {
diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h
index c65d090eac1..6853b0e9145 100644
--- a/src/glsl/nir/nir.h
+++ b/src/glsl/nir/nir.h
@@ -1732,6 +1732,8 @@ bool nir_foreach_block_reverse(nir_function_impl *impl, nir_foreach_block_cb cb,
  */
 nir_if *nir_block_get_following_if(nir_block *block);
 
+nir_loop *nir_block_get_following_loop(nir_block *block);
+
 void nir_index_local_regs(nir_function_impl *impl);
 void nir_index_global_regs(nir_shader *shader);
 void nir_index_ssa_defs(nir_function_impl *impl);