Re: [BUG] PPC math-emu multiply problem

[Dan Malek]

On Jul 29, 2004, at 10:06 AM, Kumar Gala wrote:

> On Jul 29, 2004, at 8:14 AM, Greg Weeks wrote:
>
> > I'm seeing what appears to be a bug in the ppc kernel trap math
> > emulator. An extreme case for multiplies isn't working the way gcc
> > soft-float or hardware floating point is.

I'm not surprised.  I lifted this code from Sparc, glibc, and adapted
it as best I could for PPC years ago for the 8xx.  I was happy when
it appeared to work for the general cases. :-)

Due to its overhead, I never expected it to be _the_ solution for
processors that don't have floating point hardware.  Recompiling
the libraries with soft-float and using that option when compiling
is the way to go.

Remember, don't mix soft-float compilation with libraries compiled
with HW floating point, and trap emulations.  They are not
compatible and will return erroneous results.

Thanks.


	-- Dan

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