https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100855
--- Comment #8 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > So gnu is indeed faster for real(8), but the result was changed. What OS are you using? In any sensible library REAL(4° should be faster than REAL(8). > notice the result was also changed REAL(4): 33554432.0 REAL(8): 150945570.07620683 REAL(16): 150945570.075233660889594015556531239 I did not do a full numerical analysis, but it is known that SUM is very limited for REAL(4).
