Question about the possibility of JIT in FS-UAE under Windows

SaphirJD · 03 May 2013, 21:37

FS-UAE looks great, using that since few days for demo watching

Any chance that at any point is JIT upcoming also for the Windows Versions? Since some games and Demos are quite power demanding it would be nice to see that feature for the Win Versions too. Other then that.. great work

FrodeSolheim · 06 May 2013, 00:45

Hi, there's really no reason JIT couldn't work on Windows too. When I looked at the JIT feature, and made necessary changes to make it work, it only worked on Linux and OS X, and crashed on Windows. I have not spent much time trying to figure out why, but simply disabled the JIT feature on Windows altogether.

Presumably, the bug is related to register parameter passing, C calling convention, or something similar. It is not a high-priority for me to fix that, but I won't discount the possibility that I will look at it.

Also, I'll accept patches if someone else fixes it

FrodeSolheim · 18 December 2013, 00:32

I found out why JIT does not (currently) work on Windows.

compemu_raw_x86.cpp defines different registers to pass arguments in via, depending on whether the platform is Windows (ECX_INDEX, EDX_INDEX) or not (EAX_INDEX, EDX_INDEX). So the fix is either to adjust REGPARAM #defines accordingly, or use same REGPARAM defines and the same registers on both Windows and non-Windows (both approaches should work).

Either way, JIT should work also on Windows starting with version 2.3.14

SaphirJD · 20 December 2013, 21:48

That sounds promising, looking forward for it

FrodeSolheim · 20 December 2013, 22:08

It is enabled in the latest development version, currently 2.3.15dev

03 May 2013, 21:37	#1
SaphirJD Registered User Join Date: Jun 2012 Location: Austria Posts: 76	Question about the possibility of JIT in FS-UAE under Windows FS-UAE looks great, using that since few days for demo watching Any chance that at any point is JIT upcoming also for the Windows Versions? Since some games and Demos are quite power demanding it would be nice to see that feature for the Win Versions too. Other then that.. great work

20 December 2013, 22:08	#5
FrodeSolheim FS-UAE Developer Join Date: Dec 2011 Location: Førde, Norway Age: 43 Posts: 4,043	It is enabled in the latest development version, currently 2.3.15dev Last edited by FrodeSolheim; 20 December 2013 at 22:16.

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06 May 2013, 00:45	#2
FrodeSolheim FS-UAE Developer Join Date: Dec 2011 Location: Førde, Norway Age: 43 Posts: 4,043	Hi, there's really no reason JIT couldn't work on Windows too. When I looked at the JIT feature, and made necessary changes to make it work, it only worked on Linux and OS X, and crashed on Windows. I have not spent much time trying to figure out why, but simply disabled the JIT feature on Windows altogether. Presumably, the bug is related to register parameter passing, C calling convention, or something similar. It is not a high-priority for me to fix that, but I won't discount the possibility that I will look at it. Also, I'll accept patches if someone else fixes it

18 December 2013, 00:32	#3
FrodeSolheim FS-UAE Developer Join Date: Dec 2011 Location: Førde, Norway Age: 43 Posts: 4,043	I found out why JIT does not (currently) work on Windows. compemu_raw_x86.cpp defines different registers to pass arguments in via, depending on whether the platform is Windows (ECX_INDEX, EDX_INDEX) or not (EAX_INDEX, EDX_INDEX). So the fix is either to adjust REGPARAM #defines accordingly, or use same REGPARAM defines and the same registers on both Windows and non-Windows (both approaches should work). Either way, JIT should work also on Windows starting with version 2.3.14

20 December 2013, 21:48	#4
SaphirJD Registered User Join Date: Jun 2012 Location: Austria Posts: 76	That sounds promising, looking forward for it

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