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vkd3d: Remove reliance on HAVE_BUILTIN_CTZLL. 

Signed-off-by: Hans-Kristian Arntzen <post@arntzen-software.no>
This commit is contained in:
Hans-Kristian Arntzen 2020-06-24 15:44:00 +02:00
parent 1f2499f64a
commit 66b252e08f
1 changed files with 2 additions and 10 deletions
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12
include/private/vkd3d_common.h
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@ -100,18 +100,10 @@ static inline unsigned int vkd3d_bitmask_tzcnt64(uint64_t mask)
else
return 64;
#endif
#elif defined (HAVE_BUILTIN_CTZLL)
#elif defined(__GNUC__) || defined(__clang__)
return mask ? __builtin_ctzll(mask) : 64;
#else
uint64_t r = 63;
mask &= -mask; /* extract lowest set bit */
r -= (mask & 0x00000000FFFFFFFFull) ? 32 : 0;
r -= (mask & 0x0000FFFF0000FFFFull) ? 16 : 0;
r -= (mask & 0x00FF00FF00FF00FFull) ? 8 : 0;
r -= (mask & 0x0F0F0F0F0F0F0F0Full) ? 4 : 0;
r -= (mask & 0x3333333333333333ull) ? 2 : 0;
r -= (mask & 0x5555555555555555ull) ? 1 : 0;
return mask ? r : 64;
#error "No implementation for ctzll."
#endif
}