http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49310
--- Comment #7 from Joost VandeVondele <Joost.VandeVondele at pci dot uzh.ch> 2011-06-09 06:54:33 UTC --- two more datapoints (depth=30 is still running): max-vartrack-expr-depth=22: var-tracking emit :5459.44 (99%) usr max-vartrack-expr-depth=25: var-tracking emit :42078.07 (100%) usr these are the timings for the various -Ox '-g -O0 -fbounds-check' : 14s '-g -O1 -fbounds-check' : 2631s ' -O1 -fbounds-check' : 44s '-g -O2 -fbounds-check' : 43s from this point of view, something at -O2 seems to be very good at cleaning up these very long expressions very cheaply. Would it make sense to run that pass also at -O1 (maybe only when these long expressions are observed) ?
