question on gamma function

[American Citizen]

Hello:

I did 77 digit calculations of the gamma function for 2 complex numbers (256 binary bit precision). These values agree with GP Pari v2.18.1 to 76 or 77 digits.

Is the gamma function using GP Pari's algorithm to calculate these gamma values?

My purpose for asking is that I am trying to evaluate gamma() accuracy for multiple precision calculations but need independent sources to check this out whether I am using GP Pari, or Flint 3.3.1 or mpmath or maxima, etc.

I have hit some different gamma values around 47 digits or so of accuracy (using 77 digit input values for a complex number)