Re: [hatari-devel] WinUAE CPU core CPU/FPU/DSP performance according to Centurbo benchmark

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

Hi all,

For the ST Memory cycles and Videl cycles, there are a couple of 
interresting documents :


A great article about ST-Ram access from Mikro :

http://mikro.naprvyraz.sk/docs/mikro/030_stram.html


From Rodolphe Czuba :

http://centek.online.fr/atari/ct2/ct2_tech.htm

I'm sure there's another one which explain better the videl cycles, but 
I can't find it anymore.

From Chris/Aura :

In Burst Mode, the video system  reads  17  32-bit data words into the
VIDEL's FIFO buffer. The system requires 4 cycles per burst-cycle.

Laurent






Le 02/01/2015 23:21, Eero Tamminen a écrit :
> Hi,
>
> On perjantai 02 tammikuu 2015, Nicolas Pomarède wrote:
> > Some of the results of gembench could be used (ram/rom access, int
> > division, ...) but unless we disassemble it, we don't know what kind of
> > operations are done. It would be better to start with our own/simpler
> > tests to ensure our bases are solid, then move to more complex
> > benchmarks made by others.
> Attached is a profile of what gembench does during the CPU test
> (some rounds in first and last test are probably missing).
>
> If you e.g. search for "fp", you can see that Gembench tests
> more FPU instructions, but each test includes also other
> than FPU instructions.  See e.g. code for "fadd" test:
> $00060760 : tst.l     $1dc(a4)      0.03% (2403, 19236, 0)
> $00060764 : ble.s     $6077c        0.03% (2403, 4, 0)
> $00060766 : movem.l   d0-d3,-(sp)   0.03% (2403, 67384, 0)
> $0006076a : fmove.d   (sp)+,fp0     0.03% (2403, 19336, 0)
> $0006076e : fadd.d    (sp),fp0      0.03% (2403, 28848, 0)
> $00060772 : fmove.d   (sp),fp0      0.03% (2403, 19224, 0)
> $00060776 : movem.l   (sp)+,d0-d1   0.03% (2403, 48096, 0)
> $0006077a : rts                     0.03% (2403, 19228, 0)
>
> Each of the tests for:
> - fadd
> - fmul
> - fsub
> - facos
> - fasin
> - flogn
>
> Looks fairly similar.
>
>
> repeats for these could be integer test part:
> $0003f37a : adda.l    #$104,a0   1.19% (108018, 479572, 0)
> $0003f380 : move.l    (a0),d0    1.19% (108018, 432576, 0)
> ...
> $0003f494 : divu.w    d4,d5      0.27% (24575, 196772, 0)
>
>
> 	- Eero