Help with compile - Page 2

demolition · 27 October 2014, 21:14

Why is clock cycle accuracy not important?

JimDrew · 28 October 2014, 01:24

Because cycle accuracy does not matter for Amigas with anything havng a 68020 or higher CPU. Only programs that require a 68000 need cycle accuracy, and we are able to provide that.

What does matter is that when an instruction executes, the end result, including the status register, needs to be correct!

meynaf · 30 October 2014, 10:38

But this software isn't a cpu tester. It it's just an emulator checking itself. In no manner will this program test a real 680x0 cpu.

Better is to rewrite all the tests present in testcases/ dir in full asm. Merely compiling the whole program is nonsense.

Besides, it may well not be working on a real 68k at all because it's designed for the pc and would get endianness issues...

JimDrew · 30 October 2014, 22:42

It was created on an Amiga, designed to be a CPU emulation system that was portable to PC, Linux, Mac, etc... I wanted to rip out the tester portion and make it all assembly code (relocatable) that could be just loaded anywhere in memory and ran.

I am going to look at each the tests, the code has the Amiga sample result as a comment. I will just go that route.

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27 October 2014, 21:14	#21
demolition Unregistered User Join Date: Sep 2012 Location: Copenhagen / DK Age: 43 Posts: 4,190	Why is clock cycle accuracy not important?

28 October 2014, 01:24	#22
JimDrew Registered User Join Date: Dec 2013 Location: Lake Havasu City, AZ Posts: 741	Because cycle accuracy does not matter for Amigas with anything havng a 68020 or higher CPU. Only programs that require a 68000 need cycle accuracy, and we are able to provide that. What does matter is that when an instruction executes, the end result, including the status register, needs to be correct!

30 October 2014, 10:38	#23
meynaf son of 68k Join Date: Nov 2007 Location: Lyon / France Age: 51 Posts: 5,323	But this software isn't a cpu tester. It it's just an emulator checking itself. In no manner will this program test a real 680x0 cpu. Better is to rewrite all the tests present in testcases/ dir in full asm. Merely compiling the whole program is nonsense. Besides, it may well not be working on a real 68k at all because it's designed for the pc and would get endianness issues...

30 October 2014, 22:42	#24
JimDrew Registered User Join Date: Dec 2013 Location: Lake Havasu City, AZ Posts: 741	It was created on an Amiga, designed to be a CPU emulation system that was portable to PC, Linux, Mac, etc... I wanted to rip out the tester portion and make it all assembly code (relocatable) that could be just loaded anywhere in memory and ran. I am going to look at each the tests, the code has the Amiga sample result as a comment. I will just go that route.

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