These benchmarks are as useful as looking at the sky to know if it's gonna rain during the day ... they lack so much information !!
for example, I couldn't manage to find which switches were used on each compiler and test, if inline assembly was disabled or not, blabla.

Well, I'm glad that Clang "does good" in this kind of gross measure; But this benchmark it's not my coup of tea: I would prefer something which I can draw more meaningful conclusions from