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 <ichgeh@imkreisrum.de>
Reviewed-by: Qiang Yu <yuq825@gmail.com>
Reviewed-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>

diff --git a/src/gallium/drivers/lima/ir/pp/nir.c b/src/gallium/drivers/lima/ir/pp/nir.c
index d1a8bc1..f7eaccd 100644 (file)
--- 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;
          }
       }