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Added uint64_cntbits().

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This commit is contained in:
Dario Manesku
2015-01-22 19:30:43 +01:00
parent 524143452a
commit 030e426247
1 changed files with 24 additions and 1 deletions
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25
include/bx/uint32_t.h
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@@ -583,7 +583,7 @@ namespace bx
union { uint32_t ui; float flt; } utof;
utof.ui = f_result;
return utof.flt;
}
}
inline uint16_t uint16_min(uint16_t _a, uint16_t _b)
{
@@ -613,6 +613,29 @@ namespace bx
return result;
}
inline uint64_t uint64_cntbits_ref(uint64_t _val)
{
const uint32_t lo = uint32_t(_val&UINT32_MAX);
const uint32_t hi = uint32_t(_val>>32);
const uint32_t total = bx::uint32_cntbits(lo)
+ bx::uint32_cntbits(hi);
return total;
}
/// Count number of bits set.
inline uint64_t uint64_cntbits(uint64_t _val)
{
#if BX_COMPILER_GCC || BX_COMPILER_CLANG
return __builtin_popcountll(_val);
#elif BX_COMPILER_MSVC && BX_PLATFORM_WINDOWS
return __popcnt64(_val);
#else
return uint64_cntbits_ref(_val);
#endif // BX_COMPILER_
}
inline uint64_t uint64_cntlz_ref(uint64_t _val)
{
return _val & UINT64_C(0xffffffff00000000)