luau/VM/src/lnumutils.h

// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
// This code is based on Lua 5.x implementation licensed under MIT License; see lua_LICENSE.txt for details
#pragma once

#include <math.h>

#define luai_numadd(a, b) ((a) + (b))
#define luai_numsub(a, b) ((a) - (b))
#define luai_nummul(a, b) ((a) * (b))
#define luai_numdiv(a, b) ((a) / (b))
#define luai_numpow(a, b) (pow(a, b))
#define luai_numunm(a) (-(a))
#define luai_numisnan(a) ((a) != (a))
#define luai_numeq(a, b) ((a) == (b))
#define luai_numlt(a, b) ((a) < (b))
#define luai_numle(a, b) ((a) <= (b))

inline bool luai_veceq(const float* a, const float* b)
{
#if LUA_VECTOR_SIZE == 4
    return a[0] == b[0] && a[1] == b[1] && a[2] == b[2] && a[3] == b[3];
#else
    return a[0] == b[0] && a[1] == b[1] && a[2] == b[2];
#endif
}

inline bool luai_vecisnan(const float* a)
{
#if LUA_VECTOR_SIZE == 4
    return a[0] != a[0] || a[1] != a[1] || a[2] != a[2] || a[3] != a[3];
#else
    return a[0] != a[0] || a[1] != a[1] || a[2] != a[2];
#endif
}

LUAU_FASTMATH_BEGIN
inline double luai_nummod(double a, double b)
{
    return a - floor(a / b) * b;
}
LUAU_FASTMATH_END

#define luai_num2int(i, d) ((i) = (int)(d))

// On MSVC in 32-bit, double to unsigned cast compiles into a call to __dtoui3, so we invoke x87->int64 conversion path manually
#if defined(_MSC_VER) && defined(_M_IX86)
#define luai_num2unsigned(i, n) \
    { \
        __int64 l; \
        __asm { __asm fld n __asm fistp l} \
        ; \
        i = (unsigned int)l; \
    }
#else
#define luai_num2unsigned(i, n) ((i) = (unsigned)(long long)(n))
#endif

#define LUAI_MAXNUM2STR 48

LUAI_FUNC char* luai_num2str(char* buf, double n);

#define luai_str2num(s, p) strtod((s), (p))