------- Comment #6 from rguenth at gcc dot gnu dot org 2010-05-16 10:53 ------- (In reply to comment #5) > A few comments: > > (1) adding -flto or -fwhopr solves the linking problem for the polyhedron > tests > and the reduced one in comment #1. > > (2) the test in comment #4 is different as it shows up for -fwhole-file and is > not solved with -flto or -fwhopr. > > (3) I have been puzzled by the results in > http://users.physik.fu-berlin.de/~tburnus/gcc-trunk/benchmark/ for > fatigue.f90. > It is due to -fwhole-program: > > [macbook] lin/test% gfc -O3 -ffast-math -fwhole-file -flto fatigue.f90 > [macbook] lin/test% time a.out > ... > 9.223u 0.004s 0:09.23 99.8% 0+0k 0+0io 0pf+0w > [macbook] lin/test% gfc -O3 -ffast-math -fwhole-program fatigue.f90 > [macbook] lin/test% time a.out > ... > 6.482u 0.004s 0:06.49 99.8% 0+0k 0+0io 0pf+0w > > It would be interesting to understand why and to keep this nice speed up when > fixing this pr.
-fwhole-program enables -fwhole-file. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40873
