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

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