Re: [hatari-devel] view the DSP stack?

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To: hatari-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [hatari-devel] view the DSP stack?
From: Douglas Little <doug694@xxxxxxxxxxxxxx>
Date: Sun, 17 Feb 2013 15:58:18 +0000
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Hi Laurent,

PS: Doug, I still have a patch ready to be send for the DSP timings, but I'd like to be sure there's a problem before sending it.

I finally got around to taking the measurements you asked for - the test does indeed show a difference in timing for L: memory references involving external memory.

Falcon030:

DSP ( L:Int P:Int ) -> 16.00 Mips (~100%)

DSP ( L:Ext P:Int ) -> 8.00 Mips (~100%)

DSP ( L:Int P:Ext ) -> 16.00 Mips (~100%)

DSP ( L:Ext P:Ext ) -> 5.33 Mips (~100%)

Hatari:

DSP ( L:Int P:Int ) -> 16.00 Mips (~100%)

DSP ( L:Ext P:Int ) -> 5.35 Mips (~67%)

DSP ( L:Int P:Ext ) -> 16.00 Mips (~100%)

DSP ( L:Ext P:Ext ) -> 4.00 Mips (~75%)

Cheers,

Doug.