STINNER Victor <[email protected]> added the comment:
Python/dtoa.c uses:
/* Standard NaN used by _Py_dg_stdnan. */
#define NAN_WORD0 0x7ff80000
#define NAN_WORD1 0
/* Return a 'standard' NaN value.
There are exactly two quiet NaNs that don't arise by 'quieting' signaling
NaNs (see IEEE 754-2008, section 6.2.1). If sign == 0, return the one whose
sign bit is cleared. Otherwise, return the one whose sign bit is set.
*/
double
_Py_dg_stdnan(int sign)
{
U rv;
word0(&rv) = NAN_WORD0;
word1(&rv) = NAN_WORD1;
if (sign)
word0(&rv) |= Sign_bit;
return dval(&rv);
}
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Python tracker <[email protected]>
<https://bugs.python.org/issue46640>
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