I currently build my project, written in Fortran, with
the following command line.
gfortran14 -c -pipe -Wall -fPIC -O3 -march=native -mtune=native \
-funroll-loops --param max-unroll-times=4 -ftree-vectorize \
-ftree-parallelize-loops=2 -fopt-info-optall \
-Wl,-rpath=/usr/local/lib/gcc14 -fno-backtrace \
-Wno-maybe-uninitialized -Wno-conversion -Wno-integer-division \
-I. -I/mnt3/kargl/estcp/tier/build/modules XXXXX.f90
The same option except -c are used while linking.
% make -DNATIVE -DO3 -DOPTINFO |& tee zxc1
% grep grep -i optimized\: zxc1 | wc -l
7883
% grep -i optimized\: zxc1 | grep -i unrolled | wc -l
2464
% grep -i optimized\: zxc1 | grep -i vectori | wc -l
2381
% grep -i optimized\: zxc1 | grep -i parallel | wc -l
741
% grep -i optimized\: zxc1 | grep -i inlin | wc -l
188
If I delete everything and recompile with the -flto option
added to the command line I see
% make -DNATIVE -DO3 -DOPTINFO -DLTO |& tee zxc2
% grep -i optimized\: zxc2 | wc -l
652
% grep -i optimized\: zxc2 | grep -i unrolled | wc -l
0
% grep -i optimized\: zxc2 | grep -i vectori | wc -l
0
% grep -i optimized\: zxc2 | grep -i parallel | wc -l
0
% grep -i optimized\: zxc2 | grep -i inlin | wc -l
634
So, my question is "Does -flto simply suppress reporting from
-fopt-info-optall or does -flto actually suppress unrolling,
tree vectorization, and tree auto parallization.
--
Steve
