------- Comment #10 from burnus at gcc dot gnu dot org 2010-06-21 17:00 ------- (In reply to comment #9) > (In reply to comment #7) > > I cannot reproduce the factor of 10 results, however. > Here this still is the case (so might depend on the precise architecture):
OK, I was using -fwhole-file out of habit - thus the difference is that small (all optimization levels, including -O0). Otherwise, I also get the same factor-of-10 difference. If one splits it in two files, one needs to use "-O3 -flto" to get a fast program. For comparison, using two files, ifort also shows a factor of 2 to 5 difference (and is at -O0 ten times slower than gfortran; at -O2 it is twice as fast as gfortran). -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41137
