lima/ppir: add ppir_node to ppir_src

We'll need it if we want to walk through node sources

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

src/gallium/drivers/lima/ir/pp/lower.c

@@ -54,7 +54,7 @@ static bool ppir_lower_const(ppir_block *block, ppir_node *node)
             ppir_alu_node *alu = ppir_node_to_alu(move);
             alu->dest = *dest;
             alu->num_src = 1;
-            ppir_node_target_assign(alu->src, dest);
+            ppir_node_target_assign(alu->src, node);
             for (int i = 0; i < 4; i++)
                alu->src->swizzle[i] = i;
          }
@@ -104,7 +104,7 @@ static bool ppir_lower_load(ppir_block *block, ppir_node *node)
    dest->pipeline = ppir_pipeline_reg_uniform;
 
    alu->num_src = 1;
-   ppir_node_target_assign(&alu->src[0], dest);
+   ppir_node_target_assign(&alu->src[0], node);
    for (int i = 0; i < 4; i++)
       alu->src->swizzle[i] = i;
 
@@ -174,7 +174,7 @@ static bool ppir_lower_texture(ppir_block *block, ppir_node *node)
    dest->pipeline = ppir_pipeline_reg_sampler;
 
    alu->num_src = 1;
-   ppir_node_target_assign(&alu->src[0], dest);
+   ppir_node_target_assign(&alu->src[0], node);
    for (int i = 0; i < 4; i++)
       alu->src->swizzle[i] = i;
 
@@ -223,7 +223,7 @@ static bool ppir_lower_select(ppir_block *block, ppir_node *node)
    assert(ppir_node_first_pred(node) == move);
 
    src->swizzle[0] = 0;
-   ppir_node_target_assign(alu->src, move_dest);
+   ppir_node_target_assign(alu->src, move);
    return true;
 }
 

src/gallium/drivers/lima/ir/pp/nir.c

@@ -111,8 +111,7 @@ static void ppir_node_add_src(ppir_compiler *comp, ppir_node *node,
       }
    }
 
-   ppir_dest *dest = ppir_node_get_dest(child);
-   ppir_node_target_assign(ps, dest);
+   ppir_node_target_assign(ps, child);
 }
 
 static int nir_to_ppir_opcodes[nir_num_opcodes] = {

src/gallium/drivers/lima/ir/pp/node.c

@@ -407,8 +407,7 @@ static void _ppir_node_replace_child(ppir_src *src, ppir_node *old_child, ppir_n
 {
    ppir_dest *od = ppir_node_get_dest(old_child);
    if (ppir_node_target_equal(src, od)) {
-      ppir_dest *nd = ppir_node_get_dest(new_child);
-      ppir_node_target_assign(src, nd);
+      ppir_node_target_assign(src, new_child);
    }
 }
 

src/gallium/drivers/lima/ir/pp/node_to_instr.c

@@ -62,7 +62,7 @@ static bool insert_to_each_succ_instr(ppir_block *block, ppir_node *node)
             ppir_alu_node *alu = ppir_node_to_alu(move);
             alu->dest = *dest;
             alu->num_src = 1;
-            ppir_node_target_assign(alu->src, dest);
+            ppir_node_target_assign(alu->src, node);
             for (int i = 0; i < 4; i++)
                alu->src->swizzle[i] = i;
          }

src/gallium/drivers/lima/ir/pp/ppir.h

@@ -188,6 +188,7 @@ typedef enum {
 
 typedef struct ppir_src {
    ppir_target type;
+   ppir_node *node;
 
    union {
       ppir_reg *ssa;
@@ -467,18 +468,25 @@ static inline ppir_src *ppir_node_get_src(ppir_node *node, int idx)
    return NULL;
 }
 
-static inline void ppir_node_target_assign(ppir_src *src, ppir_dest *dest)
+static inline void ppir_node_target_assign(ppir_src *src, ppir_node *node)
 {
+   ppir_dest *dest = ppir_node_get_dest(node);
    src->type = dest->type;
    switch (src->type) {
    case ppir_target_ssa:
       src->ssa = &dest->ssa;
+      src->node = node;
       break;
    case ppir_target_register:
       src->reg = dest->reg;
+      /* Registers can be assigned from multiple nodes, so don't keep
+       * pointer to the node here
+       */
+      src->node = NULL;
       break;
    case ppir_target_pipeline:
       src->pipeline = dest->pipeline;
+      src->node = node;
       break;
    }
 }