On Tue, Oct 18, 2016 at 3:12 PM, Nicolai Hähnle <nhaeh...@gmail.com> wrote: > On 18.10.2016 15:07, Jan Ziak wrote: >> >> On Tue Oct 18 09:29:59 UTC 2016, Eero Tamminen wrote: >>> >>> On 18.10.2016 01:07, Jan Ziak wrote: >>>> >>>> - The total number of executed instructions goes down from 64.184 to >>>> 63.797 >>>> giga-instructions when Mesa is compiled with "gcc -O0 ..." >>> >>> >>> Please don't do performance related decisions based on data from >>> compiling code with optimizations disabled. Use -O2 or -O3 (or even >>> better, check both). >> >> >> Options -O2 and -O3 interfere with profiling tools. > >> >> >> I will try using -Og the next time. > > > Just stop and use proper profiling tools like perf that can work with > optimized tools. You may have to compile with -fno-omit-frame-pointer, but > anything more than that is going to distort your measurement results so much > that they're worthless. > > Nicolai
The function from -O0, -O1, -O2 to number-of-instructions (or to number-of-cycles) is in the vast majority of cases a monotonically decreasing function. Are you saying that this rule does not hold in the case of this patch? Jan _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
