Re: [B2-devel] SheepShaver FPU emulation accuracy

[Rob S. <Ro...@xb...>]

Sorry for my late reply,

Geometry Sketchpad uses the FPU heavily when doing the more complex =
designs
in it.  Granted this is a educational title and most people don=92t have =
a
copy of it floating around but I do know it uses the fpu heavily  as it =
does
not work well at all on the 601 series ppc that less than stellar fpu
performance.  Also it at states in the requirements that an fpu must be
present. =20

-----Original Message-----
From: bas...@li...
[mailto:bas...@li...] On Behalf Of =
Gwenole
Beauchesne
Sent: Tuesday, July 04, 2006 3:29 AM
To: bas...@li...
Subject: [B2-devel] SheepShaver FPU emulation accuracy

Hi,

I have just committed code that will provide much improved FPU=20
emulation when PPC_ENABLE_FPU_EXCEPTIONS is set to 1. This is currently=20
disabled because (i) slow down factor is 3 vs. the previous code, (ii)=20
I have yet to find out a real Mac application that would benefit from=20
it. Does anyone know about one?

Testing was largely covered by VEX's jm-ppc-test slightly modified to=20
check more FPSCR flags and more values coverage. The glibc test-arith,=20
test-arithf, test-float, test-double tests also all pass. This is for=20
ppc. For x86_64, this is mostly complete provided you use gcc >=3D =
4.0.1.=20
Some errors remain with fma related instructions and a few test-double=20
tests.

Note that testing was only done with linux/ppc test programs. Again, if=20
someone knows of a real Mac application that would benefit from precise=20
exception bits, please tell.

Thanks,
Gwenol=E9.

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