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util: fix consteval CountTrailingZeroes impl

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This commit is contained in:
Michael Scire 2021-10-11 13:15:11 -07:00
parent 1c5edaf4fb
commit d27fe8a229
1 changed files with 3 additions and 0 deletions
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libraries/libvapours/include/vapours/util/util_bitutil.hpp
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@ -195,6 +195,7 @@ namespace ams::util {
} }
static_assert(CountLeadingZeros(~static_cast<u64>(0)) == 0); static_assert(CountLeadingZeros(~static_cast<u64>(0)) == 0);
static_assert(CountLeadingZeros(static_cast<u64>(1) << 5) == BITSIZEOF(u64) - 1 - 5);
static_assert(CountLeadingZeros(static_cast<u64>(0)) == BITSIZEOF(u64)); static_assert(CountLeadingZeros(static_cast<u64>(0)) == BITSIZEOF(u64));
template<typename T> requires std::integral<T> template<typename T> requires std::integral<T>
@ -202,6 +203,7 @@ namespace ams::util {
if (std::is_constant_evaluated()) { if (std::is_constant_evaluated()) {
auto count = 0; auto count = 0;
for (size_t i = 0; i < BITSIZEOF(T) && (x & 1) == 0; ++i) { for (size_t i = 0; i < BITSIZEOF(T) && (x & 1) == 0; ++i) {
x >>= 1;
++count; ++count;
} }
return count; return count;
@ -226,6 +228,7 @@ namespace ams::util {
} }
static_assert(CountTrailingZeros(~static_cast<u64>(0)) == 0); static_assert(CountTrailingZeros(~static_cast<u64>(0)) == 0);
static_assert(CountTrailingZeros(static_cast<u64>(1) << 5) == 5);
static_assert(CountTrailingZeros(static_cast<u64>(0)) == BITSIZEOF(u64)); static_assert(CountTrailingZeros(static_cast<u64>(0)) == BITSIZEOF(u64));
template<typename T> requires std::integral<T> template<typename T> requires std::integral<T>