Thanks for the advice! I tried the -O1 level and for my applications it generally generates smaller code size (what I'm really looking for) and doesn't have the same optimization bugs I ran into with the -O2 and -Os.
Robert -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Thursday, February 08, 2007 1:28 PM To: uClinux development list Subject: Re: [uClinux-dev] C++ O2 optimization bugs? Robert Daniels wrote: > I've been using the snapgear toolchain arm-linux-tools-20051123 with the > gcc-3.3.2 compiler and have experienced some -O2 optimization bugs in my > c++ application. I've tracked these bugs down and tweaked my code to > eliminate them but don't know if there are any more. Did you try other compiler optimisation levels? I'd try at least -O1 and possible -Os to see if the bugs are present at those settings. The code speed differences aren't usually great. We build most of our products with -O1 since it typically produces smaller and faster code for the CPUs we are targetting (arm, sh-4 and previously coldfire -- all small cache). Don't blindly believe higher optimisation levels mean faster. > I'm wondering if I upgrade to a newer version of the toolchain if I'll have > a greater probability of reduced optimization bugs. Usually this is true. However, newer versions have introduced bugs on occasion. > toolchain which I believe includes gcc-3.4.4 - does anyone know if there > are improvements to the gcc optimizer that would improve my situation? Without knowing the details of the bugs you are running up against, this question isn't really answerable :-) You could check the gcc change log but I doubt it would make a lot of sense. Regards, Pauli -- Dr Paul Dale, Software Grunt, SnapGear Leaders in embedded Linux security http://www.SnapGear.com/ _______________________________________________ uClinux-dev mailing list [email protected] http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by [email protected] To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev _______________________________________________ uClinux-dev mailing list [email protected] http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by [email protected] To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
