From 34d57d56eb667f2fe69a602d839074d1485c1931 Mon Sep 17 00:00:00 2001
From: Courtney Goeltzenleuchter <courtney@LunarG.com>
Date: Wed, 21 Oct 2015 17:08:06 -0600
Subject: WIP bug-14815: VkShaderStage

---
 layers/vk_layer_utils.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'layers/vk_layer_utils.h')

diff --git a/layers/vk_layer_utils.h b/layers/vk_layer_utils.h
index 643e1d25..bd5eac86 100644
--- a/layers/vk_layer_utils.h
+++ b/layers/vk_layer_utils.h
@@ -24,6 +24,9 @@
  **************************************************************************/
 #pragma once
 #include <stdbool.h>
+#ifndef WIN32
+#include <strings.h> /* for ffs() */
+#endif
 
 #ifdef __cplusplus
 extern "C" {
@@ -48,6 +51,14 @@ bool   vk_format_is_srgb(VkFormat format);
 bool   vk_format_is_compressed(VkFormat format);
 size_t vk_format_get_size(VkFormat format);
 
+static inline int u_ffs(int val)
+{
+#ifdef WIN32
+        return __lzcnt(val) + 1;
+#else
+        return ffs(val);
+#endif
+}
 
 #ifdef __cplusplus
 }
-- 
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