Tifa's CP Library

:heavy_check_mark: u32tostr (src/code/fast/u32tostr.hpp)

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#ifndef TIFALIBS_FAST_UINT2STR_32
#define TIFALIBS_FAST_UINT2STR_32

#include "../util/util.hpp"

namespace tifa_libs {

CEXP u32 u32tostr_si16(u64 x, char *s) {
  if (x <= 9) return *s = (char)(x | 0x30), 1;
  else if (x <= 99) {
    u64 lo = x, ll = ((lo * 103) >> 9) & 0x1E;
    return lo += ll * 3, ll = ((lo & 0xF0) >> 4) | ((lo & 0x0F) << 8), *(u16 *)s = (u16)(ll | 0x3030), 2;
  } else return 0;
}
CEXP u32 u32tostr_si32(u64 x, char *s) {
  u64 lo = 0, ll = 0;
  u32 digits = 0;
  if (x <= 99) return u32tostr_si16(x, s);
  lo = x, digits = (lo > 999) ? 4 : 3;
  ll = ((lo * 5243) >> 19) & 0xFF, lo = ((lo - ll * 100) << 16) | ll, ll = ((lo * 103) >> 9) & 0x1E001E, lo += ll * 3;
  ll = ((lo & 0x00F000F0) << 28) | ((lo & 0x000F000F) << 40) | 0x3030303000000000;
  if (u8 *p = (u8 *)&ll; digits == 4) *(u32 *)s = *(u32 *)(&p[4]);
  else *(u16 *)s = *(u16 *)(&p[5]), *(((u8 *)s) + 2) = p[7];
  return digits;
}

CEXP u32 u32tostr(u64 x, char *s) {
  u64 low = 0, ll = 0;
  u32 digits = 0;
  if (x <= 9999) return u32tostr_si32(x, s);
  if (x < 100000000) {
    if ((low = x) > 999999) digits = (low > 9999999) ? 8 : 7;
    else digits = (low > 99999) ? 6 : 5;
  } else {
    u64 high = (x * 0x55E63B89) >> 57;
    low = x - (high * 100000000), digits = u32tostr_si16(high, s) + 8;
  }
  ll = (low * 109951163) >> 40, (low -= ll * 10000) |= ll << 32;
  ll = ((low * 5243) >> 19) & 0x000000FF000000FF, low = ((low - ll * 100) << 16) | ll;
  ll = ((low * 103) >> 9) & 0x001E001E001E001E, low += ll * 3;
  ll = ((low & 0x00F000F000F000F0) >> 4) | (low & 0x000F000F000F000F) << 8;
  ll = (ll >> 32) | (ll << 32) | 0x3030303030303030;
  if (digits >= 8) memcpy(s + digits - 8, &ll, 8);
  else {
    u32 d = digits;
    char *s1 = s, *pll = &(((char *)&ll)[8 - digits]);
    if (d >= 4) memcpy(s1, pll, 4), s1 += 4, pll += 4, d -= 4;
    if (d >= 2) memcpy(s1, pll, 2), s1 += 2, pll += 2, d -= 2;
    if (d > 0) *(u8 *)s1 = *(u8 *)pll;
  }
  return digits;
}

}  // namespace tifa_libs

#endif
#line 1 "src/code/fast/u32tostr.hpp"



#line 1 "src/code/util/util.hpp"



#include <bits/stdc++.h>

#define CEXP constexpr
#define TPN typename
#define CR const&

#define cT_(...) std::conditional_t<sizeof(__VA_ARGS__) <= sizeof(size_t), __VA_ARGS__, __VA_ARGS__ CR>
#define fle_(T, i, l, r, ...) for (T i = (l), i##e = (r)__VA_OPT__(, ) __VA_ARGS__; i <= i##e; ++i)
#define flt_(T, i, l, r, ...) for (T i = (l), i##e = (r)__VA_OPT__(, ) __VA_ARGS__; i < i##e; ++i)

#ifdef ONLINE_JUDGE
#undef assert
#define assert(x) 42
#endif

using i8 = int8_t;
using i16 = int16_t;
using i32 = int32_t;
using i64 = int64_t;
using i128 = __int128_t;
using isz = ptrdiff_t;

using u8 = uint8_t;
using u16 = uint16_t;
using u32 = uint32_t;
using u64 = uint64_t;
using u128 = __uint128_t;
using usz = size_t;

using f32 = float;
using f64 = double;
using f128 = long double;

template <class T>
using ptt = std::pair<T, T>;
template <class T>
using pt3 = std::tuple<T, T, T>;
template <class T>
using pt4 = std::tuple<T, T, T, T>;

template <class E>
using itl = std::initializer_list<E>;
template <class T, usz N>
using arr = std::array<T, N>;
template <class T>
using vec = std::vector<T>;
template <class T>
using vvec = vec<vec<T>>;
template <class T>
using v3ec = vec<vvec<T>>;
template <class U, class T>
using vecp = vec<std::pair<U, T>>;
template <class U, class T>
using vvecp = vvec<std::pair<U, T>>;
template <class T>
using vecpt = vec<ptt<T>>;
template <class T>
using vvecpt = vvec<ptt<T>>;
template <class T>
using ptvec = ptt<vec<T>>;
template <class T>
using ptvvec = ptt<vvec<T>>;

template <class T, class C = std::less<T>>
using pq = std::priority_queue<T, vec<T>, C>;
template <class T>
using pqg = std::priority_queue<T, vec<T>, std::greater<T>>;

using strn = std::string;
using strnv = std::string_view;
template <class T, usz ext = std::dynamic_extent>
using spn = std::span<T const, ext>;

#define mk_(V, A, T) using V##A = V<T>;
#define mk(A, T) mk_(ptt, A, T) mk_(pt3, A, T) mk_(pt4, A, T) mk_(vec, A, T) mk_(vvec, A, T) mk_(v3ec, A, T) mk_(vecpt, A, T) mk_(vvecpt, A, T) mk_(ptvec, A, T) mk_(ptvvec, A, T) mk_(spn, A, T) mk_(itl, A, T)
mk(b, bool) mk(i, i32) mk(u, u32) mk(ii, i64) mk(uu, u64);
#undef mk
#undef mk_

using namespace std::literals;
CEXP i8 operator""_i8(unsigned long long x) { return (i8)x; }
CEXP i16 operator""_i16(unsigned long long x) { return (i16)x; }
CEXP i32 operator""_i32(unsigned long long x) { return (i32)x; }
CEXP i64 operator""_i64(unsigned long long x) { return (i64)x; }
CEXP isz operator""_iz(unsigned long long x) { return (isz)x; }

CEXP u8 operator""_u8(unsigned long long x) { return (u8)x; }
CEXP u16 operator""_u16(unsigned long long x) { return (u16)x; }
CEXP u32 operator""_u32(unsigned long long x) { return (u32)x; }
CEXP u64 operator""_u64(unsigned long long x) { return (u64)x; }
CEXP usz operator""_uz(unsigned long long x) { return (usz)x; }

inline const auto fn_0 = [](auto&&...) {};
inline const auto fn_is0 = [](auto x) { return x == 0; };

template <std::floating_point FP>
inline FP eps_v = std::sqrt(std::numeric_limits<FP>::epsilon());
template <std::floating_point FP>
CEXP void set_eps(FP v) { eps_v<FP> = v; }
using std::numbers::pi_v;

namespace tifa_libs {
using std::min, std::max, std::swap;
template <class T>
constexpr T abs(T x) { return x < 0 ? -x : x; }
}  // namespace tifa_libs


#line 5 "src/code/fast/u32tostr.hpp"

namespace tifa_libs {

CEXP u32 u32tostr_si16(u64 x, char *s) {
  if (x <= 9) return *s = (char)(x | 0x30), 1;
  else if (x <= 99) {
    u64 lo = x, ll = ((lo * 103) >> 9) & 0x1E;
    return lo += ll * 3, ll = ((lo & 0xF0) >> 4) | ((lo & 0x0F) << 8), *(u16 *)s = (u16)(ll | 0x3030), 2;
  } else return 0;
}
CEXP u32 u32tostr_si32(u64 x, char *s) {
  u64 lo = 0, ll = 0;
  u32 digits = 0;
  if (x <= 99) return u32tostr_si16(x, s);
  lo = x, digits = (lo > 999) ? 4 : 3;
  ll = ((lo * 5243) >> 19) & 0xFF, lo = ((lo - ll * 100) << 16) | ll, ll = ((lo * 103) >> 9) & 0x1E001E, lo += ll * 3;
  ll = ((lo & 0x00F000F0) << 28) | ((lo & 0x000F000F) << 40) | 0x3030303000000000;
  if (u8 *p = (u8 *)&ll; digits == 4) *(u32 *)s = *(u32 *)(&p[4]);
  else *(u16 *)s = *(u16 *)(&p[5]), *(((u8 *)s) + 2) = p[7];
  return digits;
}

CEXP u32 u32tostr(u64 x, char *s) {
  u64 low = 0, ll = 0;
  u32 digits = 0;
  if (x <= 9999) return u32tostr_si32(x, s);
  if (x < 100000000) {
    if ((low = x) > 999999) digits = (low > 9999999) ? 8 : 7;
    else digits = (low > 99999) ? 6 : 5;
  } else {
    u64 high = (x * 0x55E63B89) >> 57;
    low = x - (high * 100000000), digits = u32tostr_si16(high, s) + 8;
  }
  ll = (low * 109951163) >> 40, (low -= ll * 10000) |= ll << 32;
  ll = ((low * 5243) >> 19) & 0x000000FF000000FF, low = ((low - ll * 100) << 16) | ll;
  ll = ((low * 103) >> 9) & 0x001E001E001E001E, low += ll * 3;
  ll = ((low & 0x00F000F000F000F0) >> 4) | (low & 0x000F000F000F000F) << 8;
  ll = (ll >> 32) | (ll << 32) | 0x3030303030303030;
  if (digits >= 8) memcpy(s + digits - 8, &ll, 8);
  else {
    u32 d = digits;
    char *s1 = s, *pll = &(((char *)&ll)[8 - digits]);
    if (d >= 4) memcpy(s1, pll, 4), s1 += 4, pll += 4, d -= 4;
    if (d >= 2) memcpy(s1, pll, 2), s1 += 2, pll += 2, d -= 2;
    if (d > 0) *(u8 *)s1 = *(u8 *)pll;
  }
  return digits;
}

}  // namespace tifa_libs
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