What requires an FPU?

[SpeedGeek]

FPU version is more accurate but slower than integer version!
See the readme for mpega.library here:
http://fi.aminet.net/util/libs/mpega_library.readme
 
However, for apps which actually require Floating Point support hardware FPU is certainly faster than Floating Point emulation.

[Piru]

FPU version is more accurate but slower than integer version!
See the readme for mpega.library here:
http://fi.aminet.net/util/libs/mpega_library.readme
 

You realize this is a different code base than the libmad MPEGA library linked before? Just because the original integer MPEGA.library accuracy is lower doesn't mean that this would be some kind of generic rule. The original interger MPEGA.library just sucks. From the libmad MPEGA.library readme:

Code: [Select]

- Very high quality decoding (better than the FPU version of the original).

[Heiroglyph]

I wouldn't worry about speed, this isn't a real CPU.

It's going to be an emulation, but not the overkill for my use UAE JIT.

If you ignore all the unused parts and have no timing constraints, you can make a pretty fast processor in a shorter period of time.

It's somewhere between an 030 and an 040, minus the MMU and FPU at this point and I hoped to put off writing the FPU if possible.

[golem]

For me an FPU was a must-have once I got an accelerator that had a space for one.
11 years later I'm still waiting to find a use for it though!

[Rob]

The only piece of commercial software I can think of that requires an FPU is Clickboom's Quake port.

I think there are probably quite a few AGA demos that require one.

[Heiroglyph]

UAE is already available and specialized for those cases, I'm only worried about OS legal applications.

I think I've got enough info to go on at this point.  I don't think I'll have to do the FPU.

Thanks.

[SpeedGeek]

You realize this is a different code base than the libmad MPEGA library linked before? Just because the original integer MPEGA.library accuracy is lower doesn't mean that this would be some kind of generic rule. The original interger MPEGA.library just sucks. From the libmad MPEGA.library readme:

Code: [Select]

- Very high quality decoding (better than the FPU version of the original).

Also from the libmad MPEGA.library:
- Very low CPU usage (integer original is still faster on 68k though).
 
The point I was trying to make is that integer math is almost always faster than floating point math on 68K. The execution speed of integer or floating point instructions is completely irrelevant to accuracy.

[Iggy]

Warp3D requires an FPU.

Cuubk

coks

Couln't the 68K emulate a 69000/20/30 Fpu? How abiout emulaoingr om pu ftom an '30.







k rmiiulatevand fou/

[Heiroglyph]

Looks like you might need to emulate a keyboard

[smerf]

I'm trying to find out what 68k applications require an FPU.

By that I mean, what will refuse to run without one?

I'm trying to find the most basic 68k CPU that pretty much all OS legal software would run on and that seems like the 68020 with no MMU or FPU.

Thanks!

Hi,

An FPU (floating point unit) is mostly used for mathematical calculations, I really don't think a program will refuse to run with out one, it is just that it will take longer to make the math calculations. Spreadsheets and 3D rendering actually use an FPU if there is one available in the machine.

So ......

adding an FPU should make some programs run faster if they are coded to use it.

smerf

[LaserBack]

The only piece of commercial software I can think of that requires an FPU is Clickboom's Quake port.

I think there are probably quite a few AGA demos that require one.

yes...quake is the unique amiga game that requires fpu...that's why is so slow
also duke nukem 3d requires fpu but is for mac anyways if you run the game under emulation via shapeshifter you need fpu

also
 
-some ppl posted incorreclty that some apps required FPU and that's not true
-mp3 player do not requires fpu....all mp3 players uses mpega library and there is a integer version and fpu version......of course the faster version is the integer used to play and the fpu version is for precision


and yes...there are not commercial software that requires FPU
anyways I can guarantee that the program Simplemail requires FPU...don't ask me why the author did that mistake

[Piru]

of course the faster version is the integer used to play and the fpu version is for precision

Incorrect. The most precise one is the libmad integer MPEGA.library.

[bbond007]

I'm trying to find out what 68k applications require an FPU.

By that I mean, what will refuse to run without one?

I'm trying to find the most basic 68k CPU that pretty much all OS legal software would run on and that seems like the 68020 with no MMU or FPU.

Thanks!

I had a A1200 accelerator with defective FPU and that would cause more problems than you'd think...

[tasmanian guy]

Vista landscape generator when installed with fpu option 6881 icon, requires a FPU ;-)