Hans-Kristian Arntzen : vkd3d: Add MSVC path for vkd3d_log2i.
Alexandre Julliard
julliard at winehq.org
Tue Oct 1 15:42:40 CDT 2019
Module: vkd3d
Branch: master
Commit: 69660ca5c908fe17ab0ad717454fcd01fce93e0a
URL: https://source.winehq.org/git/vkd3d.git/?a=commit;h=69660ca5c908fe17ab0ad717454fcd01fce93e0a
Author: Hans-Kristian Arntzen <post at arntzen-software.no>
Date: Tue Oct 1 12:33:39 2019 +0200
vkd3d: Add MSVC path for vkd3d_log2i.
Signed-off-by: Hans-Kristian Arntzen <post at arntzen-software.no>
Signed-off-by: Henri Verbeet <hverbeet at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
include/private/vkd3d_common.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/private/vkd3d_common.h b/include/private/vkd3d_common.h
index ba4b68a..d8fb361 100644
--- a/include/private/vkd3d_common.h
+++ b/include/private/vkd3d_common.h
@@ -84,7 +84,13 @@ static inline bool vkd3d_bitmask_is_contiguous(unsigned int mask)
/* Undefined for x == 0. */
static inline unsigned int vkd3d_log2i(unsigned int x)
{
-#ifdef HAVE_BUILTIN_CLZ
+#ifdef _MSC_VER
+ /* _BitScanReverse returns the index of the highest set bit,
+ * unlike clz which is 31 - index. */
+ unsigned long result;
+ _BitScanReverse(&result, x);
+ return (unsigned int)result;
+#elif defined(HAVE_BUILTIN_CLZ)
return __builtin_clz(x) ^ 0x1f;
#else
static const unsigned int l[] =
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