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nir/cf: Make extracting or re-inserting nothing a no-op

This commit is contained in:
Jason Ekstrand 2015-12-23 18:10:08 -08:00
parent eae352e75c
commit e1b1d58bec
1 changed files with 9 additions and 0 deletions
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9
src/glsl/nir/nir_control_flow.c
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@ -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) {