I did months ago gcc/FDO with a xp/lite installation as a "repetitive task" :) I did not improve the timings after all the effort.
Christian On 4/18/05, Daniel Egger <[EMAIL PROTECTED]> wrote: > On 18.04.2005, at 11:51, Ian Rogers wrote: > > > I'm not sure if you can get GCC to generate code sequences like this, > > but you probably at least need to use the -fprofile-generate and > > -fprofile-use options > > http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html > > Feedback optimisation (FDO) will not work for two reasons: > a) qemu itself is something like a realtime compiler so FDO > will only speed up the compiler but not the generated code > b) FDO will only provide speed boosts if the feedback phase > has a chance to analyse a representative work pattern that > is hopefully also repetitive > > After all FDO is mostly about making a tradeoff size/speed > and rearranging code (mostly branches) to avoid branch > mispredictions of the CPU. > > Servus, > Daniel > > > _______________________________________________ > Qemu-devel mailing list > Qemu-devel@nongnu.org > http://lists.nongnu.org/mailman/listinfo/qemu-devel > > > > -- Christian _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
