Sean Silva via cfe-dev <cfe-...@lists.llvm.org> writes:
>> We have to support many different systems and those systems are always
>> changing (new processors, new BIOS, new OS, etc.). Performance can vary
>> widely day to day from factors completely outside the compiler's
>> control. As the performance changes you have to keep updating the tests
>> to expect the new performance numbers. Relying on performance
>> measurements to ensure something like vectorization is happening just
>> isn't reliable in our experience.
>
> Could you compare performance with vectorization turned on and off?
That might catch more things but now you're running tests twice and it
still won't catch some cases.
-David
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