------- Comment #2 from jakub at gcc dot gnu dot org 2007-07-04 11:57 ------- Can't reproduce this, gcc 4.3 actually seems to be faster (tests done on Intel quadcore Core2): /usr/src/gcc-4.2/obj/gcc/gfortran -B /usr/src/gcc-4.2/obj/gcc/ -L /usr/src/gcc-4.2/obj/x86_64-unknown-linux-gnu/32/libgfortran/.libs/ -Wl,-rpath,/usr/src/gcc-4.2/obj/x86_64-unknown-linux-gnu/32/libgfortran/.libs/ -m32 -march=opteron -ffast-math -funroll-loops -ftree-vectorize -ftree-loop-linear -O3 rnflow.f90 -o rnflow42 /usr/src/gcc/obj/gcc/gfortran -B /usr/src/gcc/obj/gcc/ -L /usr/src/gcc/obj/x86_64-unknown-linux-gnu/32/libgfortran/.libs/ -Wl,-rpath,/usr/src/gcc/obj/x86_64-unknown-linux-gnu/32/libgfortran/.libs/ -m32 -march=opteron -ffast-math -funroll-loops -ftree-vectorize -ftree-loop-linear -O3 rnflow.f90 -o rnflow43 gfortran -m32 -march=opteron -ffast-math -funroll-loops -ftree-vectorize -ftree-loop-linear -O3 rnflow.f90 -o rnflow41
for i in 1 2 3; do time ./rnflow4$i > /dev/null; time ./rnflow4$i > /dev/null; done real 0m30.003s user 0m29.601s sys 0m0.399s real 0m29.811s user 0m29.436s sys 0m0.370s real 0m29.875s user 0m29.468s sys 0m0.403s real 0m29.824s user 0m29.441s sys 0m0.378s real 0m26.007s user 0m25.627s sys 0m0.376s real 0m25.822s user 0m25.403s sys 0m0.415s -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31897
