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[Base] Add Windows-ARM64 `bit_count` implementation 

Uses intrinsics from https://learn.microsoft.com/en-us/cpp/intrinsics/arm64-intrinsics?view=msvc-170
This commit is contained in:
Wunkolo 2024-04-27 17:49:40 -07:00
parent fe9c98efac
commit 045441a305
1 changed files with 7 additions and 0 deletions
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7
src/xenia/base/math.h
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@ -133,10 +133,17 @@ constexpr inline uint32_t bit_count(T v) {
}
#else
#if XE_COMPILER_MSVC || XE_COMPILER_INTEL
#if XE_ARCH_AMD64
inline uint32_t bit_count(uint32_t v) { return __popcnt(v); }
inline uint32_t bit_count(uint64_t v) {
return static_cast<uint32_t>(__popcnt64(v));
}
#elif XE_ARCH_ARM64
inline uint32_t bit_count(uint32_t v) { return _CountOneBits(v); }
inline uint32_t bit_count(uint64_t v) {
return static_cast<uint32_t>(_CountOneBits64(v));
}
#endif
#elif XE_COMPILER_GCC || XE_COMPILER_CLANG
static_assert(sizeof(unsigned int) == sizeof(uint32_t));
static_assert(sizeof(unsigned long long) == sizeof(uint64_t));