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#1 |
Registered User
Join Date: Jul 2008
Location: Poland
Posts: 678
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SoftFloat FPU emulation
Hi Toni, could this new feature be made as program?
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#2 |
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,581
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I think you need to be more specific.. "Program"?
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#3 |
Registered User
Join Date: Nov 2014
Location: Italy
Posts: 2,499
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i think like mac application to enable fpu emulation (i don't remember the name)
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#4 |
Registered User
Join Date: Apr 2013
Location: Engelsdorf / Germany
Posts: 468
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If you mean as FPU emulation for real Amigas, look at this page.
https://www.youtube.com/results?sear...oftfpu+vampire But remember, you'll need in any case a fast CPU |
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#5 | |
Registered User
Join Date: Jul 2008
Location: Poland
Posts: 678
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Quote:
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#6 |
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,581
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I guess it is doable. (But don't ask me to do it)
Biggest missing part is F-line exception handler that decodes FPU instructions, decodes effective addresses (I don't think the platform you think about does that even if real 68EC040/060 does it.. FPU stack frames may have same problem), and more and redirects execution to emulator code. It will be very slow because softfloat internally calculates everything in extended precision (80-bit) format, just like real 6888x FPU. |
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#7 |
Banned
Join Date: Nov 2007
Location: Trondheim, Norway
Posts: 1,893
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Funny thing is, if you run old software-fpu in Shapeshifter - guess what happens?
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