lima/ppir: fix ordering deps

There can be several root nodes, i.e.:

(1) r0 = r1
(2) r2 = r3
(3) branch if (ssa1)

We need to make (3) depend on (1) and (2), old code added
dependency only for (2), and (1) was kept as root node since there
is no branch/discard or store color between two movs.

Tested-by: Andreas Baierl <[email protected]>
Reviewed-by: Qiang Yu <[email protected]>
Reviewed-by: Erico Nunes <[email protected]>
Signed-off-by: Vasily Khoruzhick <[email protected]>

1 files changed, 8 insertions, 6 deletions

diff --git a/src/gallium/drivers/lima/ir/pp/nir.c b/src/gallium/drivers/lima/ir/pp/nir.c
index d1a8bc140b6..f7eaccd7c63 100644
--- a/src/gallium/drivers/lima/ir/pp/nir.c
+++ b/src/gallium/drivers/lima/ir/pp/nir.c
@@ -576,12 +576,14 @@ static void ppir_add_ordering_deps(ppir_compiler *comp)
     */
    list_for_each_entry(ppir_block, block, &comp->block_list, list) {
       ppir_node *prev_node = NULL;
-      list_for_each_entry(ppir_node, node, &block->node_list, list) {
-         if (node->type == ppir_node_type_discard ||
-             node->type == ppir_node_type_store ||
-             node->type == ppir_node_type_branch) {
-            if (prev_node)
-               ppir_node_add_dep(node, prev_node);
+      list_for_each_entry_rev(ppir_node, node, &block->node_list, list) {
+         if (prev_node && ppir_node_is_root(node) && node->op != ppir_op_const) {
+            ppir_node_add_dep(prev_node, node);
+         }
+         if (node->op == ppir_op_discard ||
+             node->op == ppir_op_store_color ||
+             node->op == ppir_op_store_temp ||
+             node->op == ppir_op_branch) {
             prev_node = node;
          }
       }