i965/cfg: Add function to generate a dot file of the CFG.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/brw_cfg.cpp

@@ -495,3 +495,17 @@ cfg_t::intersect(bblock_t *b1, bblock_t *b2)
    assert(b1);
    return b1;
 }
+
+void
+cfg_t::dump_cfg()
+{
+   printf("digraph CFG {\n");
+   for (int b = 0; b < num_blocks; b++) {
+      bblock_t *block = this->blocks[b];
+
+      foreach_list_typed_safe (bblock_link, child, link, &block->children) {
+         printf("\t%d -> %d\n", b, child->block->num);
+      }
+   }
+   printf("}\n");
+}

src/mesa/drivers/dri/i965/brw_cfg.h

@@ -274,6 +274,7 @@ struct cfg_t {
    static bblock_t *intersect(bblock_t *b1, bblock_t *b2);
 
    void dump(backend_visitor *v);
+   void dump_cfg();
 #endif
    void *mem_ctx;