------- Comment #1 from pinskia at gmail dot com 2010-04-22 23:51 ------- Subject: Re: New: -Os creates larger binaries than before in some cases (-falign-... options enabled)
Which target is this for? Sent from my iPhone On Apr 22, 2010, at 4:48 PM, "rwahl at gmx dot de" <gcc-bugzi...@gcc.gnu.org > wrote: > Hi, > > I just noticed that some of my libraries are greater when compiled > with gcc > 4.4.3 instead of gcc 4.3.2. Diffing the output of "gcc -- > help=optimizers -Q > -Os" shows this in 4.3.2: > > -falign-jumps [disabled] > -falign-labels [disabled] > -falign-loops [enabled] > > and this for 4.4.3: > > -falign-functions [enabled] > -falign-jumps [enabled] > -falign-labels [enabled] > -falign-loops [disabled] > > when explicitely disabling the alignment options then the code size > shrinks. > For libxml2 in my case from 704256 to 675584 bytes. > > The manual says: > > -Os disables the following optimization flags: -falign-functions > -falign-jumps -falign-loops -falign-labels -freorder- > blocks > -freorder-blocks-and-partition -fprefetch-loop-arrays > -ftree-vect-loop-version > > which is not true (even not for 4.3.2 since loop alignment was > enabled). Some > other opts like -freorder-blocks is enabled as well. > > So is this actually a bug or is the documentation outdated or even > both? > > > -- > Summary: -Os creates larger binaries than before in some > cases (- > falign-... options enabled) > Product: gcc > Version: 4.4.3 > Status: UNCONFIRMED > Severity: normal > Priority: P3 > Component: middle-end > AssignedTo: unassigned at gcc dot gnu dot org > ReportedBy: rwahl at gmx dot de > > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43861 > -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43861
