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d3dx9: Use BitScanReverse in make_pow2. 

Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Matteo Bruni <mbruni@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Jacek Caban 2020-06-10 14:21:03 +02:00 committed by Alexandre Julliard
parent 24c84947c8
commit 22970932d0
1 changed files with 2 additions and 13 deletions
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15
dlls/d3dx9_36/d3dx9_private.h
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@ -229,19 +229,8 @@ static inline BOOL is_param_type_sampler(D3DXPARAMETER_TYPE type)
/* Returns the smallest power of 2 which is greater than or equal to num */
static inline uint32_t make_pow2(uint32_t num)
{
#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)))
return num == 1 ? 1 : 1u << ((__builtin_clz(num - 1) ^ 0x1f) + 1);
#else
num--;
num |= num >> 1;
num |= num >> 2;
num |= num >> 4;
num |= num >> 8;
num |= num >> 16;
num++;
return num;
#endif
uint32_t index;
return BitScanReverse(&index, num - 1) ? 1u << (index + 1) : 1;
}
struct d3dx_parameter;