From 506a467f16453fe51c65f3f14fb2a37d5ba662d2 Mon Sep 17 00:00:00 2001
From: Jason Ekstrand <jason.ekstrand@intel.com>
Date: Tue, 5 Jan 2016 15:56:59 -0800
Subject: [PATCH] nir/spirv/cfg: Assert that blocks only ever get added once

This effectively prevents infinite loops in cfg_walk_blocks.
---
 src/glsl/nir/spirv/vtn_cfg.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/glsl/nir/spirv/vtn_cfg.c b/src/glsl/nir/spirv/vtn_cfg.c
index a8e149a00a6..646b960d179 100644
--- a/src/glsl/nir/spirv/vtn_cfg.c
+++ b/src/glsl/nir/spirv/vtn_cfg.c
@@ -281,6 +281,7 @@ vtn_cfg_walk_blocks(struct vtn_builder *b, struct list_head *cf_list,
          continue;
       }
 
+      assert(block->node.link.next == NULL);
       list_addtail(&block->node.link, cf_list);
 
       switch (*block->branch & SpvOpCodeMask) {
-- 
2.30.2