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vkd3d: Add MSVC path for vkd3d_log2i.

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Signed-off-by: Hans-Kristian Arntzen <post@arntzen-software.no>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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Hans-Kristian Arntzen 2019-10-01 12:33:39 +02:00 committed by Alexandre Julliard
parent 1e5ebae339
commit 69660ca5c9
1 changed files with 7 additions and 1 deletions
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8
include/private/vkd3d_common.h
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@ -84,7 +84,13 @@ static inline bool vkd3d_bitmask_is_contiguous(unsigned int mask)
/* Undefined for x == 0. */ /* Undefined for x == 0. */
static inline unsigned int vkd3d_log2i(unsigned int x) 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; return __builtin_clz(x) ^ 0x1f;
#else #else
static const unsigned int l[] = static const unsigned int l[] =