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update headers

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This commit is contained in:
Nick Fisher
2022-12-05 17:51:44 +08:00
parent 58942ba94d
commit e0f9cfbde6
234 changed files with 62619 additions and 9800 deletions
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12
ios/include/utils/algorithm.h
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@@ -46,10 +46,10 @@ constexpr inline T clz(T x) noexcept {
x |= (x >> 4u);
x |= (x >> 8u);
x |= (x >> 16u);
if (sizeof(T) * CHAR_BIT >= 64) { // just to silence compiler warning
if constexpr (sizeof(T) * CHAR_BIT >= 64) { // just to silence compiler warning
x |= (x >> 32u);
}
if (sizeof(T) * CHAR_BIT >= 128) { // just to silence compiler warning
if constexpr (sizeof(T) * CHAR_BIT >= 128) { // just to silence compiler warning
x |= (x >> 64u);
}
return T(sizeof(T) * CHAR_BIT) - details::popcount(x);
@@ -59,7 +59,13 @@ template<typename T, typename = std::enable_if_t<std::is_unsigned<T>::value>>
constexpr inline T ctz(T x) noexcept {
static_assert(sizeof(T) * CHAR_BIT <= 64, "details::ctz() only support up to 64 bits");
T c = sizeof(T) * CHAR_BIT;
x &= -x; // equivalent to x & (~x + 1)
#if defined(_MSC_VER)
// equivalent to x & -x, but MSVC yield a warning for using unary minus operator on unsigned types
x &= (~x + 1);
#else
// equivalent to x & (~x + 1), but some compilers generate a better sequence on ARM
x &= -x;
#endif
if (x) c--;
if (sizeof(T) * CHAR_BIT >= 64) {
if (x & T(0x00000000FFFFFFFF)) c -= 32;