lima/ppir: add node dependency types

Currently we add dependecies in 3 cases:
1) One node consumes value produced by another node
2) Sequency dependencies
3) Write after read dependencies

2) and 3) only affect scheduler decisions since we still can use pipeline
register if we have only 1 dependency of type 1).

Add 3 dependency types and mark dependencies as we add them.

Reviewed-by: Qiang Yu <yuq825@gmail.com>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>

1 files changed, 22 insertions, 3 deletions

diff --git a/src/gallium/drivers/lima/ir/pp/node.c b/src/gallium/drivers/lima/ir/pp/node.c
index ded556d87c8..5428a7b37f4 100644
--- a/src/gallium/drivers/lima/ir/pp/node.c
+++ b/src/gallium/drivers/lima/ir/pp/node.c
@@ -387,7 +387,8 @@ void *ppir_node_create(ppir_block *block, ppir_op op, int index, unsigned mask)
    return node;
 }
 
-void ppir_node_add_dep(ppir_node *succ, ppir_node *pred)
+void ppir_node_add_dep(ppir_node *succ, ppir_node *pred,
+                       ppir_dep_type type)
 {
    /* don't add dep for two nodes from different block */
    if (succ->block != pred->block)
@@ -402,6 +403,7 @@ void ppir_node_add_dep(ppir_node *succ, ppir_node *pred)
    ppir_dep *dep = ralloc(succ, ppir_dep);
    dep->pred = pred;
    dep->succ = succ;
+   dep->type = type;
    list_addtail(&dep->pred_link, &succ->pred_list);
    list_addtail(&dep->succ_link, &pred->succ_list);
 }
@@ -661,7 +663,7 @@ ppir_node_clone_tex(ppir_block *block, ppir_node *node)
       switch (src->type) {
       case ppir_target_ssa: {
          ppir_node_target_assign(new_src, new_tex_coords);
-         ppir_node_add_dep(&new_tnode->node, new_tex_coords);
+         ppir_node_add_dep(&new_tnode->node, new_tex_coords, ppir_dep_src);
          break;
       }
       case ppir_target_register: {
@@ -737,8 +739,25 @@ ppir_node *ppir_node_insert_mov(ppir_node *node)
       alu->src->swizzle[s] = s;
 
    ppir_node_replace_all_succ(move, node);
-   ppir_node_add_dep(move, node);
+   ppir_node_add_dep(move, node, ppir_dep_src);
    list_addtail(&move->list, &node->list);
 
    return move;
 }
+
+bool ppir_node_has_single_src_succ(ppir_node *node)
+{
+   if (list_is_singular(&node->succ_list) &&
+       list_first_entry(&node->succ_list,
+                        ppir_dep, succ_link)->type == ppir_dep_src)
+      return true;
+
+   int cnt = 0;
+   ppir_node_foreach_succ(node, dep) {
+      if (dep->type != ppir_dep_src)
+         continue;
+      cnt++;
+   }
+
+   return cnt == 1;
+}