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Replace utils::cntlz{32,64} with std::countl_zero

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This commit is contained in:
Nekotekina 2020-04-13 21:57:16 +03:00
parent d0c199d455
commit 032e7c0491
11 changed files with 22 additions and 47 deletions
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24
Utilities/asm.h
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@ -4,30 +4,6 @@
namespace utils
{
inline u32 cntlz32(u32 arg, bool nonzero = false)
{
#ifdef _MSC_VER
ulong res;
return _BitScanReverse(&res, arg) || nonzero ? res ^ 31 : 32;
#elif __LZCNT__
return _lzcnt_u32(arg);
#else
return arg || nonzero ? __builtin_clz(arg) : 32;
#endif
}
inline u64 cntlz64(u64 arg, bool nonzero = false)
{
#ifdef _MSC_VER
ulong res;
return _BitScanReverse64(&res, arg) || nonzero ? res ^ 63 : 64;
#elif __LZCNT__
return _lzcnt_u64(arg);
#else
return arg || nonzero ? __builtin_clzll(arg) : 64;
#endif
}
inline u8 popcnt32(u32 arg)
{
#ifdef _MSC_VER

4
Utilities/cfmt.h
View file

@ -59,7 +59,7 @@ std::size_t cfmt_append(Dst& out, const Char* fmt, Src&& src)
const auto write_octal = [&](u64 value, u64 min_num)
{
out.resize(out.size() + std::max<u64>(min_num, 66 / 3 - (utils::cntlz64(value | 1, true) + 2) / 3), '0');
out.resize(out.size() + std::max<u64>(min_num, 66 / 3 - (std::countl_zero<u64>(value | 1) + 2) / 3), '0');
// Write in reversed order
for (auto i = out.rbegin(); value; i++, value /= 8)
@ -70,7 +70,7 @@ std::size_t cfmt_append(Dst& out, const Char* fmt, Src&& src)
const auto write_hex = [&](u64 value, bool upper, u64 min_num)
{
out.resize(out.size() + std::max<u64>(min_num, 64 / 4 - utils::cntlz64(value | 1, true) / 4), '0');
out.resize(out.size() + std::max<u64>(min_num, 64 / 4 - std::countl_zero<u64>(value | 1) / 4), '0');
// Write in reversed order
for (auto i = out.rbegin(); value; i++, value /= 16)