> The best way to test IRA is to build and use the branch. It is easy to > compare the old RA (which is the default on the branch) and IRA (-fira > option switches IRA on). I'd recommend to try the following option sets: > -fira > -fira -fira-algorithm=CB
OK, I've done that and I see a 40% to 60% increase in compilation time for the first (Fortran) testcase I tried, is that expected? With the compiler from the ira branch on x86_64-linux, here are the timings reported by "gfortran -c -time -save-temps" with and without IRA (two timings provided for each set of option, to check reproducability): With -O0 # f951 148.97 9.92 # as 3.95 0.18 # f951 137.51 7.05 # as 3.98 0.17 With -O0 -fira # f951 223.89 10.91 # as 3.67 0.18 # f951 218.98 8.43 # as 3.61 0.19 -O0 -fira -fira-algorithm=CB # f951 191.32 9.03 # as 3.65 0.15 # f951 190.92 8.96 # as 3.63 0.18 (The testcase is 400k lines of preprocessed Fortran code, 16M is size, available here: http://www.pci.unizh.ch/vandevondele/tmp/all_cp2k_gfortran.f90.gz) FX -- FX Coudert http://www.homepages.ucl.ac.uk/~uccafco/
