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Editing: longintrepr.h

#ifndef Py_LIMITED_API
#ifndef Py_LONGINTREPR_H
#define Py_LONGINTREPR_H
#ifdef __cplusplus
extern "C" {
#endif

/* This is published for the benefit of "friends" marshal.c and _decimal.c. */

/* Parameters of the integer representation.  There are two different
   sets of parameters: one set for 30-bit digits, stored in an unsigned 32-bit
   integer type, and one set for 15-bit digits with each digit stored in an
   unsigned short.  The value of PYLONG_BITS_IN_DIGIT, defined either at
   configure time or in pyport.h, is used to decide which digit size to use.

Type 'digit' should be able to hold 2*PyLong_BASE-1, and type 'twodigits'
   should be an unsigned integer type able to hold all integers up to
   PyLong_BASE*PyLong_BASE-1.  x_sub assumes that 'digit' is an unsigned type,
   and that overflow is handled by taking the result modulo 2**N for some N >
   PyLong_SHIFT.  The majority of the code doesn't care about the precise
   value of PyLong_SHIFT, but there are some notable exceptions:

- PyLong_{As,From}ByteArray require that PyLong_SHIFT be at least 8

- long_hash() requires that PyLong_SHIFT is *strictly* less than the number
     of bits in an unsigned long, as do the PyLong <-> long (or unsigned long)
     conversion functions

- the Python int <-> size_t/Py_ssize_t conversion functions expect that
     PyLong_SHIFT is strictly less than the number of bits in a size_t

- the marshal code currently expects that PyLong_SHIFT is a multiple of 15

- NSMALLNEGINTS and NSMALLPOSINTS should be small enough to fit in a single
     digit; with the current values this forces PyLong_SHIFT >= 9

The values 15 and 30 should fit all of the above requirements, on any
  platform.
*/

#if PYLONG_BITS_IN_DIGIT == 30
typedef uint32_t digit;
typedef int32_t sdigit; /* signed variant of digit */
typedef uint64_t twodigits;
typedef int64_t stwodigits; /* signed variant of twodigits */
#define PyLong_SHIFT    30
#define _PyLong_DECIMAL_SHIFT   9 /* max(e such that 10**e fits in a digit) */
#define _PyLong_DECIMAL_BASE    ((digit)1000000000) /* 10 ** DECIMAL_SHIFT */
#elif PYLONG_BITS_IN_DIGIT == 15
typedef unsigned short digit;
typedef short sdigit; /* signed variant of digit */
typedef unsigned long twodigits;
typedef long stwodigits; /* signed variant of twodigits */
#define PyLong_SHIFT    15
#define _PyLong_DECIMAL_SHIFT   4 /* max(e such that 10**e fits in a digit) */
#define _PyLong_DECIMAL_BASE    ((digit)10000) /* 10 ** DECIMAL_SHIFT */
#else
#error "PYLONG_BITS_IN_DIGIT should be 15 or 30"
#endif
#define PyLong_BASE     ((digit)1 << PyLong_SHIFT)
#define PyLong_MASK     ((digit)(PyLong_BASE - 1))

/* Long integer representation.
   The absolute value of a number is equal to
        SUM(for i=0 through abs(ob_size)-1) ob_digit[i] * 2**(SHIFT*i)
   Negative numbers are represented with ob_size < 0;
   zero is represented by ob_size == 0.
   In a normalized number, ob_digit[abs(ob_size)-1] (the most significant
   digit) is never zero.  Also, in all cases, for all valid i,
        0 <= ob_digit[i] <= MASK.
   The allocation function takes care of allocating extra memory
   so that ob_digit[0] ... ob_digit[abs(ob_size)-1] are actually available.
   We always allocate memory for at least one digit, so accessing ob_digit[0]
   is always safe. However, in the case ob_size == 0, the contents of
   ob_digit[0] may be undefined.

CAUTION:  Generic code manipulating subtypes of PyVarObject has to
   aware that ints abuse  ob_size's sign bit.
*/

typedef struct _PyLongValue {
    uintptr_t lv_tag; /* Number of digits, sign and flags */
    digit ob_digit[1];
} _PyLongValue;

struct _longobject {
    PyObject_HEAD
    _PyLongValue long_value;
};

PyAPI_FUNC(PyLongObject *) _PyLong_New(Py_ssize_t);

/* Return a copy of src. */
PyAPI_FUNC(PyObject *) _PyLong_Copy(PyLongObject *src);

PyAPI_FUNC(PyLongObject *)
_PyLong_FromDigits(int negative, Py_ssize_t digit_count, digit *digits);

/* Inline some internals for speed. These should be in pycore_long.h
 * if user code didn't need them inlined. */

#define _PyLong_SIGN_MASK 3
#define _PyLong_NON_SIZE_BITS 3

static inline int
_PyLong_IsCompact(const PyLongObject* op) {
    assert(PyType_HasFeature((op)->ob_base.ob_type, Py_TPFLAGS_LONG_SUBCLASS));
    return op->long_value.lv_tag < (2 << _PyLong_NON_SIZE_BITS);
}

#define PyUnstable_Long_IsCompact _PyLong_IsCompact

static inline Py_ssize_t
_PyLong_CompactValue(const PyLongObject *op)
{
    Py_ssize_t sign;
    assert(PyType_HasFeature((op)->ob_base.ob_type, Py_TPFLAGS_LONG_SUBCLASS));
    assert(PyUnstable_Long_IsCompact(op));
    sign = 1 - (op->long_value.lv_tag & _PyLong_SIGN_MASK);
    return sign * (Py_ssize_t)op->long_value.ob_digit[0];
}

#define PyUnstable_Long_CompactValue _PyLong_CompactValue

#ifdef __cplusplus
}
#endif
#endif /* !Py_LONGINTREPR_H */
#endif /* Py_LIMITED_API */

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