[Bug target/43698] [4.5/4.6 Regression] Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations
--- Comment #11 from armin76 at gentoo dot org 2010-07-03 16:05 --- Ping :) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43698
[Bug target/43698] [4.5/4.6 Regression] Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations
-- rguenth at gcc dot gnu dot org changed: What|Removed |Added Priority|P3 |P2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43698
[Bug target/43698] [4.5/4.6 Regression] Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations
--- Comment #10 from siarhei dot siamashka at gmail dot com 2010-05-17 18:48 --- Maybe I'm too impatient, but is there anything that prevents this patch from getting committed to SVN? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43698
[Bug target/43698] [4.5/4.6 Regression] Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations
--- Comment #9 from ramana dot radhakrishnan at arm dot com 2010-04-12 09:51 --- Subject: Re: [4.5/4.6 Regression] Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations On Mon, 2010-04-12 at 09:34 +, siarhei dot siamashka at gmail dot com wrote: > > --- Comment #8 from siarhei dot siamashka at gmail dot com 2010-04-12 > 09:34 --- > (In reply to comment #7) > > Patch submitted here. > > > > http://gcc.gnu.org/ml/gcc-patches/2010-04/msg00401.html > > Thank you. I have been testing it for two days already. > > It really helps (in the sense that it is apparently better to have this fix > than not to have). I have bootstrapped the hard vfp system successfully and > did > not notice any other problems so far. Btw, miscompilation (of all the same > package) also happens with -O2 optimization settings in some other place, but > I > did not try to investigate where exactly it fails. > > But I understand that it is just a workaround for the problem which happens > somewhere in the upper layer? If REV instruction did not actually support > conditional execution, then the fix would require actually finding the real > cause. There were 2 issues, one is that REV isn't marked as being allowed conditional and the other is that the CCFSM state machine appears to go wrong in this particular case which is something I need to investigate when I have some more free time. (Note this is ARM backend specific only.) Thus the fix isn't a work-around because it introduces predicated support for something like the REV instruction which is the right thing to do here. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43698
Re: [Bug target/43698] [4.5/4.6 Regression] Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations
On Mon, 2010-04-12 at 09:34 +, siarhei dot siamashka at gmail dot com wrote: > > --- Comment #8 from siarhei dot siamashka at gmail dot com 2010-04-12 > 09:34 --- > (In reply to comment #7) > > Patch submitted here. > > > > http://gcc.gnu.org/ml/gcc-patches/2010-04/msg00401.html > > Thank you. I have been testing it for two days already. > > It really helps (in the sense that it is apparently better to have this fix > than not to have). I have bootstrapped the hard vfp system successfully and > did > not notice any other problems so far. Btw, miscompilation (of all the same > package) also happens with -O2 optimization settings in some other place, but > I > did not try to investigate where exactly it fails. > > But I understand that it is just a workaround for the problem which happens > somewhere in the upper layer? If REV instruction did not actually support > conditional execution, then the fix would require actually finding the real > cause. There were 2 issues, one is that REV isn't marked as being allowed conditional and the other is that the CCFSM state machine appears to go wrong in this particular case which is something I need to investigate when I have some more free time. (Note this is ARM backend specific only.) Thus the fix isn't a work-around because it introduces predicated support for something like the REV instruction which is the right thing to do here.
[Bug target/43698] [4.5/4.6 Regression] Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations
--- Comment #8 from siarhei dot siamashka at gmail dot com 2010-04-12 09:34 --- (In reply to comment #7) > Patch submitted here. > > http://gcc.gnu.org/ml/gcc-patches/2010-04/msg00401.html Thank you. I have been testing it for two days already. It really helps (in the sense that it is apparently better to have this fix than not to have). I have bootstrapped the hard vfp system successfully and did not notice any other problems so far. Btw, miscompilation (of all the same package) also happens with -O2 optimization settings in some other place, but I did not try to investigate where exactly it fails. But I understand that it is just a workaround for the problem which happens somewhere in the upper layer? If REV instruction did not actually support conditional execution, then the fix would require actually finding the real cause. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43698
[Bug target/43698] [4.5/4.6 Regression] Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations
--- Comment #7 from ramana at gcc dot gnu dot org 2010-04-12 08:38 --- Patch submitted here. http://gcc.gnu.org/ml/gcc-patches/2010-04/msg00401.html -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43698
[Bug target/43698] [4.5/4.6 Regression] Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations
-- rguenth at gcc dot gnu dot org changed: What|Removed |Added Summary|Invalid code when building |[4.5/4.6 Regression] Invalid |gentoo pax-utils-0.1.19 with|code when building gentoo |-Os optimizations |pax-utils-0.1.19 with -Os ||optimizations Target Milestone|--- |4.5.1 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43698
