The bug is in fact in lgammal, as tgammal(x) simply takes expl(lgammal(x)); 
namely, lgammal(6.0) produces 4.78749174278204581157 on armel, 
while it should be   closer to      4.7874917427820459942477, i.e. armel gives 
relative error of about 3.8e-17

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https://bugs.launchpad.net/bugs/713985

Title:
  [armel] Function tgammal has precision issues in version
  2.12.1-0ubuntu10.2 on ARM

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