------- Comment #15 from rguenth at gcc dot gnu dot org 2010-03-19 10:15 ------- (In reply to comment #14) > Subject: Re: [4.3 Regression] very long > compile-time in PRE building gimp-plugin-registry > > On Fri, 19 Mar 2010, kurt at garloff dot de wrote: > > > ------- Comment #11 from kurt at garloff dot de 2010-03-19 00:34 ------- > > (In reply to comment #10) > > > GCC 4.3.4 is being released, adjusting target milestone. > > > > Very non-scientific benchmark: > > Did compile latest gmic-1.3.4.0 on a 2xL5540 system (plenty of RAM) with > > make > > -j8 and compile flags: > > -O3 --param max-inline-insns-auto=200 -ffast-math -funroll-loops > > -ftree-vectorize > > Times (in seconds, user, elapsed): > > 4.3.5: 1263u, 377e > > w/ -fno-tree-pre: 755u, 202e > > 4.4.4: 1022u, 311e > > w/ -fno-tree-pre: 996u, 284e > > 4.5.0: 2325u, 615e > > w/ -fno-tree-pre: 1974u, 543e > > > > Note that this is in contrast to earlier observations that 4.4/4.5 did do > > much > > better than 4.3. Don't know whether that's caused by changed gmic code or > > whether we have regressed in 4.5. Let me know if you want me to pick one > > file > > that takes particularly long to compile and investigate further. > > This bug was about PRE causing compile-time issues at -O2 which is > what was investigated and fixed for the testcases attached to this PR. > > I see, for -O2 and the CImg.C testcase (just using openSUSE packages > from devel:gcc): > > 4.3.4 (r152973): stopped after 4min > 4.4.2 (r155966): 68s > 4.5.0 (r157384): 74s > > also see PR43415 for a similar problem where I am about to commit a > patch. > > If you can provide a testcase for plain -O3 [-ffast-math -funroll-loops] > being slow it would be appropriate to open a new bugreport for it.
Oh, and btw check if you build with debuginfo enabled. With GCC 4.5 we can spend quite some extra time producing "good" debug information. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36439 ------- You are receiving this mail because: ------- You reported the bug, or are watching the reporter. -- To UNSUBSCRIBE, email to debian-gcc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100319101538.8177.qm...@sourceware.org
