CPU speed test

Lazycow · 16 September 2016, 07:11

Hi, is there a small CPU speed test for the lazy coder?
I know I can check the CPU flags:

Code:

move.w    ExecBase_attnFlags(a6),d0
btst    #0,d0
bne.s    .no68000

But what about these nasty 68000 turbo boards, found in the MiniMig?
Do I have to use a busy-loop counter? Meh...

hooverphonique · 16 September 2016, 10:28

not much else to do.. the attnflags basically tell you which instruction set is supported, not the speed of the system.

phx · 16 September 2016, 15:41

What do you want to achieve? Testing the cpu-type or the cpu-speed are two completely different topics.

The cpu-type is most conveniently determined by AttnFlags. Except you want to detect an 68060 from the boot block - it's flag is not set before SetPatch has run.

The cpu-speed is best measured using the CIA timers around some test routines. But it's hard to detect the exact clock frequency of the chip.

Lazycow · 16 September 2016, 17:06

I just want to display a silly message like... "turbo CPU detected"... and maybe activate some additional features. Maybe not. (until now, it's triggered on 68020+)

phx · 16 September 2016, 21:14

That's easy. Then you don't have to be very precise.

Just start a CIA-timer and execute a loop with some test instructions for a few thousands of iterations, and see if your timer at the end of the loop is lower than a "turbo-threshold", which you have to define.

16 September 2016, 07:11	#1
Lazycow Registered User Join Date: Oct 2014 Location: Germany Posts: 195	CPU speed test Hi, is there a small CPU speed test for the lazy coder? I know I can check the CPU flags: Code: move.w ExecBase_attnFlags(a6),d0 btst #0,d0 bne.s .no68000 But what about these nasty 68000 turbo boards, found in the MiniMig? Do I have to use a busy-loop counter? Meh...

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16 September 2016, 10:28	#2
hooverphonique ex. demoscener "Bigmama" Join Date: Jun 2012 Location: Fyn / Denmark Posts: 1,642	not much else to do.. the attnflags basically tell you which instruction set is supported, not the speed of the system.

16 September 2016, 15:41	#3
phx Natteravn Join Date: Nov 2009 Location: Herford / Germany Posts: 2,545	What do you want to achieve? Testing the cpu-type or the cpu-speed are two completely different topics. The cpu-type is most conveniently determined by AttnFlags. Except you want to detect an 68060 from the boot block - it's flag is not set before SetPatch has run. The cpu-speed is best measured using the CIA timers around some test routines. But it's hard to detect the exact clock frequency of the chip.

16 September 2016, 17:06	#4
Lazycow Registered User Join Date: Oct 2014 Location: Germany Posts: 195	I just want to display a silly message like... "turbo CPU detected"... and maybe activate some additional features. Maybe not. (until now, it's triggered on 68020+)

16 September 2016, 21:14	#5
phx Natteravn Join Date: Nov 2009 Location: Herford / Germany Posts: 2,545	That's easy. Then you don't have to be very precise. Just start a CIA-timer and execute a loop with some test instructions for a few thousands of iterations, and see if your timer at the end of the loop is lower than a "turbo-threshold", which you have to define.

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