---
src/compiler/nir/nir_control_flow.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/compiler/nir/nir_control_flow.c
b/src/compiler/nir/nir_control_flow.c
index ecd9cbd..33b06d0 100644
--- a/src/compiler/nir/nir_control_flow.c
+++ b/src/compiler/nir/nir_control_flow.c
@@ -749,6 +749,12 @@ nir_cf_extract(nir_cf_list *extracted, nir_cursor begin,
nir_cursor end)
{
nir_block *block_begin, *block_end, *block_before, *block_after;
+ if (nir_cursors_equal(begin, end)) {
+ exec_list_make_empty(&extracted->list);
+ extracted->impl = NULL; /* we shouldn't need this */
+ return;
+ }
+
/* In the case where begin points to an instruction in some basic block and
* end points to the end of the same basic block, we rely on the fact that
* splitting on an instruction moves earlier instructions into a new basic
@@ -788,6 +794,9 @@ nir_cf_reinsert(nir_cf_list *cf_list, nir_cursor cursor)
{
nir_block *before, *after;
+ if (exec_list_is_empty(&cf_list->list))
+ return;
+
split_block_cursor(cursor, &before, &after);
foreach_list_typed_safe(nir_cf_node, node, node, &cf_list->list) {
--
2.5.0.400.gff86faf
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