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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] Hatari profiler updates and DSP cycle questions
- From: Douglas Little <doug694@xxxxxxxxxxxxxx>
- Date: Fri, 1 Feb 2013 11:00:21 +0000
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Hi Laurent,
Here is the TOS executable (and source) for the DSP test which behaves strangely under Hatari.
Sorry it's a bit messy - it's really just a hacked up version of Nembench so most of the 68k code is irrelevant / disabled (i.e. ignore everything except dsp_tests routine).
The DSP tests (68k side) perform a single host write, and a single host read to perform each test - the DSP is 100% busy between these two events, so only DSP instruction time is measured. The busy time is measured against a 200Hz TimerC elapsed count at reasonably high resolution (each test runs for several seconds).
The DSP ASM source shows each test is identical, only the internal/external memory addresses change for each round...
Note: it should be trivial to change the test for other instructions, to verify Hatari timings on unusual cases if necessary... I planned to do this anyway in the new Nembench but specific instructions may be of interest for Hatari verification...
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DSPBENCH.zip
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